/* ===================================
   CSS Variables - PMTD Color Palette
   =================================== */
:root {
    /* PMTD Logo Colors */
    --color-primary: #004E87;      /* Navy Blue - Logo ana mavi */
    --color-secondary: #72AFC1;    /* Light Blue - Açık mavi */
    --color-accent: #F1592A;       /* Orange - Turuncu vurgu */
    --color-highlight: #8CBECB;    /* Sky Blue - Açık gökyüzü mavisi */
    
    /* Neutral Colors */
    --color-dark: #000000;
    --color-dark-secondary: #2d3436;
    --color-light: #ffffff;
    --color-gray-100: #F8FAFC;
    --color-gray-200: #E8F4F8;     /* Çok açık mavi ton */
    --color-gray-300: #B2D3DA;     /* Pastel mavi */
    --color-gray-600: #6c757d;
    --color-gray-800: #004581;     /* Koyu mavi ton */
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-display: 'Playfair Display', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(139, 29, 32, 0.08);
    --shadow-md: 0 4px 16px rgba(139, 29, 32, 0.12);
    --shadow-lg: 0 8px 32px rgba(139, 29, 32, 0.16);
    --shadow-xl: 0 16px 48px rgba(139, 29, 32, 0.24);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-dark);
    line-height: 1.7;
    overflow-x: hidden;
    background: var(--color-light);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo {
    height: 70px;
}

.nav-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.3;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.nav-menu {
    display: flex;
    gap: 0.5rem;
    flex-wrap: nowrap;
    justify-content: flex-end;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 0.7rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    position: relative;
    border-bottom: 3px solid transparent;
    text-align: center;
    line-height: 1.3;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
}

.nav-link::after {
    display: none;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-accent);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 120px;
}

.hero-background {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        var(--color-gray-200) 0%, 
        var(--color-white) 50%, 
        var(--color-gray-100) 100%);
    opacity: 0.5;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--color-gray-300) 0%, transparent 70%);
    opacity: 0.05;
}

.hero-posters {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-posters::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 78, 135, 0.88) 0%, rgba(114, 175, 193, 0.92) 100%);
    z-index: 2;
}

.hero-poster {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-main {
    display: block;
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-primary);
    margin-bottom: 0.2rem;
}

.title-sub {
    display: block;
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.3rem;
}

.event-date {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, rgba(139, 29, 32, 0.1), rgba(174, 36, 40, 0.1));
    border-radius: var(--radius-lg);
    border: 3px solid var(--color-primary);
}

.event-date i {
    font-size: 2rem;
    color: var(--color-accent);
}

.hero-content-centered {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title-single {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 8px rgba(255, 255, 255, 0.8);
}

.event-info-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.event-info-card {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    padding: 1.5rem 2rem;
    background: var(--color-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    border: 2px solid var(--color-gray-200);
}

.event-info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.event-info-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 1.8rem;
    flex-shrink: 0;
}

.event-info-text {
    flex: 1;
    text-align: left;
}

.event-info-text p {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
}

.countdown-wrapper {
    margin-bottom: var(--spacing-lg);
    width: 100%;
    display: flex;
    justify-content: center;
}

.countdown {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 0 auto;
    max-width: 800px;
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 2.5rem;
    background: linear-gradient(135deg, var(--color-light), #fff9f9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 140px;
    border: 3px solid var(--color-primary);
}

.countdown-separator {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    padding: 0 0.5rem;
}

.countdown-value {
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.countdown-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.8rem;
}

.hero-invitation {
    font-size: 1.3rem;
    line-height: 1.9;
    color: var(--color-light);
    margin-bottom: var(--spacing-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-main {
    display: block;
    font-family: var(--font-display);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--color-primary);
    margin-bottom: 0.2rem;
}

.title-sub {
    display: block;
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.3rem;
}

.event-date {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, rgba(139, 29, 32, 0.1), rgba(174, 36, 40, 0.1));
    border-radius: var(--radius-lg);
    border: 3px solid var(--color-primary);
}

.event-date i {
    font-size: 2rem;
    color: var(--color-accent);
}

.countdown {
    display: flex;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.2rem 2rem;
    background: var(--color-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 100px;
}

.countdown-value {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.countdown-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.5rem;
}

.hero-description {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem 2.5rem;
    background: var(--color-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    border: 3px solid transparent;
}

.info-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.venue-card {
    background: linear-gradient(135deg, var(--color-light) 0%, #fff5f5 100%);
}

.info-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 2rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.info-text h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-text p {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.3rem;
}

.venue-location {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    color: var(--color-gray-600);
    margin-top: 0.5rem;
}

.venue-location i {
    color: var(--color-accent);
}

/* ===================================
   Blood Cell Animations (Denizli Theme)
   =================================== */
.hero-posters::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 3;
}

/* Medical/Science Shapes - Floating in background */
.animated-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
    opacity: 0.12;
}

.shape {
    position: absolute;
    border-radius: 50%;
    animation: float-cell 25s ease-in-out infinite;
}

/* Blue Circle 1 */
.shape-1 {
    width: 280px;
    height: 280px;
    background: radial-gradient(circle at 30% 30%, #72AFC1, #004E87, #004581);
    top: 10%;
    left: 5%;
    box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.2);
    animation-delay: 0s;
}

/* Light Blue Circle */
.shape-2 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(140, 190, 203, 0.9), rgba(114, 175, 193, 0.7));
    border: 8px solid rgba(0, 78, 135, 0.4);
    bottom: 15%;
    right: 8%;
    animation-delay: 5s;
}

/* Orange Accent Circle - Small */
.shape-3 {
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, #F1592A, #d94820);
    top: 60%;
    left: 15%;
    animation-delay: 7s;
}

/* Sky Blue Circle */
.shape-4 {
    width: 220px;
    height: 220px;
    background: radial-gradient(circle at 40% 40%, #8CBECB, #72AFC1);
    bottom: 25%;
    left: 40%;
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.15);
    animation-delay: 10s;
}

/* Pastel Blue Circle */
.shape-5 {
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, rgba(178, 211, 218, 0.95), rgba(114, 175, 195, 0.6));
    border: 6px solid rgba(0, 78, 135, 0.3);
    top: 35%;
    right: 12%;
    animation-delay: 12s;
}

@keyframes float-cell {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(30px, -30px) rotate(90deg);
    }
    50% {
        transform: translate(-20px, 20px) rotate(180deg);
    }
    75% {
        transform: translate(20px, 30px) rotate(270deg);
    }
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-light);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ===================================
   Typography Components
   =================================== */
.section-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: rgba(139, 29, 32, 0.1);
    border-radius: var(--radius-sm);
}

.section-label.light {
    color: var(--color-light);
    background: rgba(255, 255, 255, 0.15);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.section-title.light {
    color: var(--color-light);
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-gray-600);
    line-height: 1.8;
    max-width: 700px;
}

.section-description.light {
    color: rgba(255, 255, 255, 0.9);
}

.section-header-center {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header-center .section-label {
    display: inline-block;
}

.section-header-center .section-description {
    margin: 0 auto;
}

.lead-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--color-gray-100);
}

.about-content-full {
    text-align: left;
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
}

.about-content-full .section-label {
    display: inline-block;
}

.about-content-full .section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.info-section-text {
    background: var(--color-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: left;
}

.info-section-text h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-display);
}

.info-section-text h3:first-child {
    margin-top: 0;
}

.info-section-text h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-top: var(--spacing-sm);
    margin-bottom: 0.5rem;
    padding-left: var(--spacing-sm);
}

.info-section-text p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
    text-align: justify;
}

.info-section-text .note {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 2px solid var(--color-gray-200);
    font-style: italic;
    color: var(--color-gray-600);
}

.about-content-full .lead-text {
    font-size: 1.2rem;
    line-height: 1.9;
    color: var(--color-gray-700);
}

.about-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.stat-card {
    padding: 2rem;
    background: var(--color-light);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-number::after {
    content: '+';
    color: var(--color-accent);
}

.stat-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===================================
   Invitation Section
   =================================== */
.invitation {
    background: var(--color-light);
    padding: var(--spacing-xl) 0;
}

.invitation-content {
    display: block;
    max-width: 900px;
    margin: 0 auto;
}

.invitation-image {
    position: sticky;
    top: 100px;
}

.invitation-poster {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: var(--transition-base);
}

.invitation-poster:hover {
    transform: scale(1.02);
    box-shadow: 0 20px 60px rgba(139, 29, 32, 0.3);
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-light);
    box-shadow: var(--shadow-lg);
}

.image-placeholder i {
    font-size: 5rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.image-placeholder p {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    padding: 0 var(--spacing-sm);
}

.invitation-text {
    background: var(--color-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.invitation-text h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.invitation-body {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-dark);
    text-align: justify;
}

.invitation-body p {
    margin-bottom: var(--spacing-md);
    text-align: justify;
}

.invitation-body strong {
    color: var(--color-primary);
    font-weight: 700;
}

.invitation-signature {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--color-gray-300);
}

.invitation-signature p {
    margin-bottom: 0.5rem;
}

.signature-name {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-top: var(--spacing-sm) !important;
}

.signature-title {
    font-size: 1rem;
    color: var(--color-gray-600);
    font-style: italic;
}

/* ===================================
   Program Section
   =================================== */
.program {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-light);
}

.program-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-light);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-base);
    backdrop-filter: blur(10px);
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.tab-btn.active {
    background: var(--color-light);
    color: var(--color-primary);
    border-color: var(--color-light);
}

.program-content {
    position: relative;
}

.day-content {
    display: none;
}

.day-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 120px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: rgba(255, 255, 255, 0.2);
}

.timeline-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 110px;
    top: 8px;
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    border: 4px solid var(--color-light);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.break::before {
    background: rgba(255, 255, 255, 0.3);
}

.timeline-time {
    width: 100px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-light);
    flex-shrink: 0;
    padding-top: 0.3rem;
}

.timeline-content {
    flex: 1;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-left: var(--spacing-md);
}

.timeline-item.break .timeline-content {
    background: rgba(255, 255, 255, 0.05);
    border-style: dashed;
}

.timeline-content h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-light);
}

.timeline-content p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0.8rem;
}

.timeline-speaker {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    background: rgba(236, 50, 55, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
}

/* ===================================
   Abstract Section
   =================================== */
.abstract {
    background: var(--color-light);
}

.abstract-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.deadline-box {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--color-primary);
    color: var(--color-light);
    border-radius: var(--radius-lg);
    margin: var(--spacing-md) 0;
}

.deadline-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-size: 1.8rem;
    flex-shrink: 0;
}

.deadline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    opacity: 0.9;
}

.deadline-date {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
}

/* Abstract Cards Grid */
.abstract-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.abstract-card {
    background: var(--color-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    border: 2px solid transparent;
}

.abstract-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.abstract-card .card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 2.5rem;
}

.abstract-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.abstract-card p {
    color: var(--color-gray-600);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    text-align: center;
    flex-grow: 1;
}

.abstract-card .card-highlights {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--spacing-md) 0;
}

.abstract-card .card-highlights li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--color-gray-600);
}

.abstract-card .card-highlights li i {
    color: var(--color-accent);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.abstract-card .card-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 1.5rem;
    background: var(--color-primary);
    color: var(--color-light);
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    width: 100%;
}

.abstract-card .card-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Bildiri Kitabı Showcase
   =================================== */
.bildiri-kitabi-showcase {
    display: flex;
    align-items: center;
    gap: 5rem;
    background: linear-gradient(135deg, #eef5fb 0%, #dceef7 100%);
    border-radius: 28px;
    padding: 4rem 5rem;
    box-shadow: 0 15px 50px rgba(0, 78, 135, 0.12);
    border: 1px solid rgba(0, 78, 135, 0.08);
    margin-top: 1rem;
}

.book-mockup-wrap {
    flex-shrink: 0;
    perspective: 800px;
}

.book-mockup {
    position: relative;
    width: 160px;
    height: 220px;
    transform: rotateY(-20deg);
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    cursor: pointer;
}

.book-mockup:hover {
    transform: rotateY(-30deg);
}

.book-cover {
    position: absolute;
    width: 160px;
    height: 220px;
    background: linear-gradient(160deg, #004E87 0%, #003a65 40%, #002440 100%);
    border-radius: 0 6px 6px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem 1rem;
    box-shadow: 6px 6px 20px rgba(0,0,0,0.3);
    z-index: 2;
}

.book-cover-top {
    font-size: 1.6rem;
    color: #72AFC1;
    opacity: 0.9;
}

.book-cover-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 800;
    color: #ffffff;
    text-align: center;
    line-height: 1.2;
    letter-spacing: 0.02em;
}

.book-cover-sub {
    font-size: 0.65rem;
    font-weight: 500;
    color: rgba(255,255,255,0.7);
    text-align: center;
    line-height: 1.5;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.book-spine {
    position: absolute;
    left: -22px;
    top: 0;
    width: 22px;
    height: 220px;
    background: linear-gradient(to right, #001a2e, #003a65);
    border-radius: 3px 0 0 3px;
    transform: rotateY(-90deg);
    transform-origin: right center;
    z-index: 1;
}

.book-pages {
    position: absolute;
    right: -6px;
    top: 3px;
    width: 8px;
    height: 214px;
    background: repeating-linear-gradient(
        to bottom,
        #e8f4f8,
        #e8f4f8 1px,
        #dceef7 2px,
        #dceef7 3px
    );
    border-radius: 0 2px 2px 0;
    box-shadow: 2px 0 4px rgba(0,0,0,0.15);
    z-index: 0;
}

.bildiri-kitabi-content {
    flex: 1;
}

.bildiri-kitabi-content h3 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.8rem;
    font-family: var(--font-display);
}

.bildiri-kitabi-content p {
    color: var(--color-gray-600);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    max-width: 420px;
}

.bildiri-kitabi-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    background: var(--color-accent);
    color: #ffffff;
    padding: 1rem 2.2rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(241, 89, 42, 0.35);
}

.bildiri-kitabi-btn:hover {
    background: #d44820;
    transform: translateY(-3px);
    box-shadow: 0 14px 35px rgba(241, 89, 42, 0.45);
}

@media (max-width: 768px) {
    .bildiri-kitabi-showcase {
        flex-direction: column;
        text-align: center;
        padding: 3rem 2rem;
        gap: 3rem;
    }

    .bildiri-kitabi-content p {
        max-width: 100%;
    }

    .bildiri-kitabi-content h3 {
        font-size: 1.8rem;
    }

    .bildiri-kitabi-btn {
        width: 100%;
        justify-content: center;
    }
}

.abstract-requirements {
    margin-top: var(--spacing-md);
}

.abstract-requirements h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.abstract-requirements ul {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.abstract-requirements li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1rem;
    color: var(--color-gray-600);
}

.abstract-requirements li i {
    color: var(--color-accent);
    font-size: 1.1rem;
}

.abstract-form-container {
    background: var(--color-gray-100);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.abstract-example-box {
    background: var(--color-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 2px solid var(--color-gray-300);
    transition: var(--transition-base);
    position: relative;
}

.abstract-example-box h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.example-download-only {
    text-align: center;
    padding: var(--spacing-lg);
}

.example-download-only .example-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 3rem;
}

.example-download-only p {
    color: var(--color-gray-600);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.example-hint {
    font-size: 0.85rem;
    color: var(--color-gray-600);
    font-weight: 400;
    font-style: italic;
}

.abstract-example-preview {
    text-align: center;
    padding: var(--spacing-md);
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.example-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 2.5rem;
}

.abstract-example-preview p {
    color: var(--color-gray-600);
    font-size: 0.95rem;
}

.abstract-example-full {
    display: none;
    margin-top: var(--spacing-sm);
}

.abstract-example-box:hover .abstract-example-preview {
    display: none;
}

.abstract-example-box:hover .abstract-example-full {
    display: block;
}

.example-content {
    padding: var(--spacing-md);
    background: var(--color-light);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-family: 'Times New Roman', serif;
    font-size: 12px;
    line-height: 1.5;
}

.example-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.example-authors {
    text-align: center;
    font-size: 12px;
    margin-bottom: 0.5rem;
}

.author-line {
    margin: 0;
}

.example-affiliations {
    font-size: 10px;
    margin-bottom: 1rem;
    text-align: left;
}

.example-affiliations p {
    margin: 0;
    line-height: 1.3;
}

.example-body p {
    text-align: justify;
    margin-bottom: 0.5rem;
    font-size: 12px;
}

.example-keywords {
    margin-top: 1rem;
    font-size: 12px;
}

.example-keywords p {
    margin: 0;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-base);
    text-decoration: none;
    margin-top: 1rem;
}

.download-btn:hover {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: var(--color-primary);
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-base);
    text-decoration: none;
}

.download-btn-secondary:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-info {
    background: var(--color-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.submit-box {
    max-width: 500px;
    margin: 0 auto;
}

.submit-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 2.5rem;
}

.submit-box h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.submit-box p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
}

.email-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--color-primary);
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition-base);
    text-decoration: none;
}

.email-link:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.abstract-form h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.9rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-base);
    background: var(--color-light);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group textarea {
    resize: vertical;
}

.checkbox-label {
    display: flex;
    align-items: start;
    gap: 0.8rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-top: 0.3rem;
    cursor: pointer;
}

/* ===================================
   Registration Section
   =================================== */
.registration {
    background: var(--color-gray-100);
}

.registration-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
    margin-bottom: 40px;
}

.registration-grid.transfer-grid {
    grid-template-columns: 1fr;
}

.info-section h3 {
    font-size: 1.8rem;
    color: var(--color-dark);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
}

.price-table {
    background: var(--color-light);
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
    overflow-x: auto;
}

.price-table table {
    width: 100%;
    border-collapse: collapse;
}

.price-table thead th {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
}

.price-table thead th:first-child {
    border-radius: 10px 0 0 0;
}

.price-table thead th:last-child {
    border-radius: 0 10px 0 0;
}

.price-table tbody td {
    padding: 15px;
    border-bottom: 1px solid var(--color-gray-300);
    color: var(--color-dark);
}

.price-table tbody tr:last-child td {
    border-bottom: none;
}

.price-table tbody td:first-child {
    font-weight: 600;
}

.rules-box {
    background: var(--color-gray-100);
    padding: 25px;
    border-radius: 15px;
    border-left: 4px solid var(--color-primary);
}

.rules-box h4 {
    font-size: 1.2rem;
    color: var(--color-dark);
    margin-bottom: 15px;
}

.rules-box ul {
    list-style: none;
    padding: 0;
}

.rules-box li {
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
}

.rules-box li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.rules-box li ul {
    margin-top: 10px;
    padding-left: 20px;
}

.transfer-section {
    margin-top: 40px;
}

.transfer-title {
    font-size: 1.8rem;
    color: var(--color-dark);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
}

.transfer-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 30px;
}

.transfer-card {
    background: var(--color-light);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-base);
}

.transfer-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.transfer-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-light);
}

.transfer-card h4 {
    font-size: 1.1rem;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.transfer-card .transfer-route {
    font-size: 0.9rem;
    color: var(--color-gray-600);
    margin-bottom: 15px;
}

.transfer-card .transfer-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.transfer-card .transfer-price span {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-gray-600);
}

.important-note {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    padding: 30px;
    border-radius: 15px;
    margin-top: 40px;
    box-shadow: var(--shadow-md);
}

.important-note h4 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.important-note p {
    line-height: 1.8;
    margin-bottom: 10px;
}

.important-note p:last-child {
    margin-bottom: 0;
}

/* ===================================
   Registration Section
   =================================== */
.registration {
    background: var(--color-gray-100);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.pricing-card {
    background: var(--color-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border: 3px solid var(--color-accent);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: -35px;
    background: var(--color-accent);
    color: var(--color-light);
    padding: 0.5rem 3rem;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    transform: rotate(45deg);
    box-shadow: var(--shadow-md);
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.pricing-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 2rem;
}

.pricing-body {
    border-top: 2px solid var(--color-gray-200);
    padding-top: var(--spacing-md);
}

.price-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.price-row:last-of-type {
    border-bottom: none;
}

.price-label {
    font-size: 0.95rem;
    color: var(--color-gray-600);
}

.price-amount {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.price-note {
    display: flex;
    align-items: start;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
    padding: 0.8rem;
    background: var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-gray-600);
}

.price-note i {
    color: var(--color-accent);
    margin-top: 0.2rem;
}

.price-features {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: var(--spacing-sm);
}

.price-features .feature {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.95rem;
    color: var(--color-gray-600);
}

.price-features .feature i {
    color: var(--color-accent);
    font-size: 1.1rem;
}

.registration-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.info-box {
    padding: var(--spacing-md);
    background: var(--color-light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
}

.info-box h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.info-box h4 i {
    color: var(--color-accent);
}

.info-box p {
    font-size: 0.95rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background: var(--color-light);
}

.contact-methods-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.contact-method {
    display: flex;
    align-items: start;
    gap: 1.2rem;
    padding: 2rem;
    background: var(--color-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    box-shadow: var(--shadow-md);
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.method-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-light);
    border-radius: var(--radius-md);
    font-size: 1.3rem;
    flex-shrink: 0;
}

.method-logo {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.method-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.method-content h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.method-content p {
    font-size: 0.95rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--color-dark);
    color: var(--color-light);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.footer-brand {
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    height: 60px;
    margin: 0 auto var(--spacing-sm);
}

.footer-brand p {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-light);
}

.footer-date {
    font-size: 0.95rem;
    color: var(--color-gray-300);
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.9rem;
    color: var(--color-gray-300);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .hero-title-single {
        font-size: 3rem;
    }
    
    .event-info-cards {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
    
    .countdown {
        gap: 0.5rem;
    }
    
    .countdown-item {
        padding: 1.5rem 1.8rem;
        min-width: 110px;
    }
    
    .countdown-value {
        font-size: 3.5rem;
    }
    
    .countdown-separator {
        font-size: 3rem;
    }
    
    .hero-posters {
        opacity: 0.05;
    }
    
    .hero-poster {
        height: 50%;
    }
    
    .about-stats-row {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    
    .abstract-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .invitation-content {
        grid-template-columns: 1fr;
    }
    
    .invitation-image {
        position: relative;
        top: 0;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-posters {
        display: none;
    }
    
    .hero-title-single {
        font-size: 2.2rem;
    }
    
    .event-info-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .countdown {
        gap: 0.3rem;
        flex-wrap: wrap;
    }
    
    .countdown-item {
        padding: 1rem 1.2rem;
        min-width: 70px;
    }
    
    .countdown-value {
        font-size: 2.5rem;
    }
    
    .countdown-separator {
        font-size: 2rem;
        display: none;
    }
    
    .countdown-label {
        font-size: 0.75rem;
    }
    
    .hero-invitation {
        font-size: 1.1rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-light);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 0.8rem 1rem;
    }
    
    .title-main {
        font-size: 3rem;
    }
    
    .title-sub {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 0;
    }
    
    .timeline-item::before {
        left: -10px;
    }
    
    .timeline-time {
        width: 80px;
        font-size: 0.85rem;
    }
    
    .timeline-content {
        margin-left: var(--spacing-sm);
    }
    
    .registration-info {
        grid-template-columns: 1fr;
    }
    
    .about-stats-row {
        grid-template-columns: 1fr;
        max-width: 300px;
    }
    
    .info-section-text {
        padding: var(--spacing-md);
    }
    
    .info-section-text h3 {
        font-size: 1.1rem;
    }
    
    .info-section-text h4 {
        font-size: 1rem;
    }
    
    .info-section-text p {
        font-size: 0.95rem;
    }
    
    .abstract-grid {
        grid-template-columns: 1fr;
    }

    .abstract-cards-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .abstract-card {
        padding: var(--spacing-md);
    }
    
    .abstract-card .card-icon {
        width: 70px;
        height: 70px;
        font-size: 2rem;
    }
    
    .abstract-card h3 {
        font-size: 1.2rem;
    }
    
    .abstract-card p {
        font-size: 0.9rem;
    }
    
    .abstract-card .card-highlights li {
        font-size: 0.85rem;
    }
    
    .abstract-card .card-btn {
        padding: 0.8rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .abstract-requirements h4 {
        font-size: 1rem;
    }
    
    .abstract-requirements ul {
        font-size: 0.9rem;
    }
    
    .abstract-example-box h3 {
        font-size: 1.1rem;
    }
    
    .example-content {
        padding: var(--spacing-sm);
        font-size: 11px;
    }
    
    .submit-box {
        padding: var(--spacing-sm);
    }
    
    .submit-icon {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }
    
    .email-link {
        padding: 0.8rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .registration-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .info-section {
        margin-bottom: var(--spacing-md);
    }
    
    .info-section h3 {
        font-size: 1.4rem;
    }
    
    .price-table {
        padding: 15px;
        overflow-x: auto;
    }
    
    .price-table table {
        font-size: 0.85rem;
    }
    
    .price-table thead th {
        padding: 10px 8px;
        font-size: 0.85rem;
    }
    
    .price-table tbody td {
        padding: 10px 8px;
        font-size: 0.85rem;
    }
    
    .rules-box {
        padding: 15px;
    }
    
    .rules-box h4 {
        font-size: 1rem;
    }
    
    .rules-box li {
        font-size: 0.9rem;
        margin-bottom: 8px;
    }
    
    .transfer-title {
        font-size: 1.4rem;
    }
    
    .transfer-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .transfer-card {
        padding: 20px;
    }
    
    .transfer-icon {
        width: 60px;
        height: 60px;
        font-size: 1.8rem;
    }
    
    .transfer-card h4 {
        font-size: 1rem;
    }
    
    .transfer-price {
        font-size: 1.2rem;
    }
    
    .important-note {
        padding: 20px;
    }
    
    .important-note h4 {
        font-size: 1.2rem;
    }
    
    .important-note p {
        font-size: 0.9rem;
    }
    
    .contact-methods-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .invitation-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .invitation-image {
        max-width: 250px;
        margin: 0 auto;
    }
    
    .invitation-text {
        padding: var(--spacing-md);
    }
    
    .invitation-text h3 {
        font-size: 1.3rem;
    }
    
    .invitation-body {
        font-size: 0.95rem;
    }
    
    .signature-name {
        font-size: 1.2rem;
    }
    
    .contact-method {
        padding: 1.2rem;
    }
    
    .method-icon {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
    
    .method-content h4 {
        font-size: 0.95rem;
    }
    
    .method-content p {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .program-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
    }
}