/* 
   ICDSE 2026 Kerala - Global Stylesheet
   Designed with Premium Plus Glassmorphic theme & Responsive Web Best Practices
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* Color Variables & Themes */
:root {
    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Transition defaults */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadow styles */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.2);

    /* Layout */
    --container-width: 1280px;
}

/* Theme: Dark Mode (Default) */
[data-theme="dark"] {
    --bg-primary: #080c16;
    --bg-secondary: #0d1527;
    --bg-tertiary: #141f38;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --color-primary: #06b6d4;
    /* Cyan */
    --color-primary-glow: rgba(6, 182, 212, 0.15);
    --color-secondary: #6366f1;
    /* Indigo */
    --color-secondary-glow: rgba(99, 102, 241, 0.15);
    --color-accent: #f59e0b;
    /* Gold/Orange */

    --border-color: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(13, 21, 39, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: rgba(0, 0, 0, 0.3);
}

/* Theme: Light Mode */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --color-primary: #0891b2;
    /* Deep Cyan */
    --color-primary-glow: rgba(8, 145, 178, 0.1);
    --color-secondary: #4f46e5;
    /* Deep Indigo */
    --color-secondary-glow: rgba(79, 70, 229, 0.1);
    --color-accent: #d97706;
    /* Deep Gold */

    --border-color: rgba(0, 0, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.06);
    --glass-shadow: rgba(15, 23, 42, 0.05);
}

/* Basic Resets & Document Setup */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typographic Defaults */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary);
}

ul {
    list-style-position: inside;
}

/* Layout Classes */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

.section {
    padding: 6rem 0;
    position: relative;
}

.section-alt {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.text-center {
    text-align: center;
}

.section-title {
    margin-bottom: 3.5rem;
    position: relative;
    display: inline-block;
}

.section-title h2 {
    margin-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 0 auto;
    border-radius: 2px;
}

/* Frosted Glass Component */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow-md), 0 1px 0 var(--glass-border) inset;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.glass-panel:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(6, 182, 212, 0.3);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-family: var(--font-heading);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.95rem;
    gap: 0.5rem;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
    transform: scale(1.03);
    color: #ffffff;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
}

/* Sticky Header & Navigation */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(8, 12, 22, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition-normal);
}

[data-theme="light"] .main-header {
    background: rgba(255, 255, 255, 0.85);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.03em;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-primary);
}

/* Responsive Menu Elements */
.menu-btn {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    outline: none;
    width: 30px;
    height: 24px;
    position: relative;
}

.menu-btn span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 3px;
    position: absolute;
    transition: transform var(--transition-fast), top var(--transition-fast), opacity var(--transition-fast);
}

.menu-btn span:nth-child(1) {
    top: 0;
}

.menu-btn span:nth-child(2) {
    top: 10px;
}

.menu-btn span:nth-child(3) {
    top: 20px;
}

/* Control buttons: Theme Toggle */
.controls-container {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.theme-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--color-primary);
}

.theme-toggle-btn .sun-icon {
    display: none;
}

.theme-toggle-btn .moon-icon {
    display: block;
}

[data-theme="light"] .theme-toggle-btn .sun-icon {
    display: block;
}

[data-theme="light"] .theme-toggle-btn .moon-icon {
    display: none;
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 85vh;
    padding-top: 120px;
    background: url('../assets/images/hero_bg.png') no-repeat center center/cover;
    overflow: hidden;
    z-index: 1;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.1), transparent 50%),
        linear-gradient(180deg, rgba(8, 12, 22, 0.4) 0%, var(--bg-primary) 100%);
    z-index: -1;
}

[data-theme="light"] .hero-section::before {
    background: radial-gradient(circle at 70% 30%, rgba(8, 145, 178, 0.15), transparent 50%),
        linear-gradient(180deg, rgba(248, 250, 252, 0.5) 0%, var(--bg-primary) 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
    min-height: 65vh;
}

.hero-tag {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: var(--color-primary-glow);
    border: 1px solid var(--color-primary);
    border-radius: 50px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.15;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 4rem;
}

.hero-meta-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hero-meta-item i {
    color: var(--color-primary);
    font-size: 1.5rem;
}

.hero-meta-text h5 {
    margin-bottom: 0.1rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
}

.hero-meta-text p {
    font-weight: 600;
    color: var(--text-primary);
}

/* Countdown Clock */
.countdown-container {
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.countdown-title {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.countdown-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.countdown-box {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1rem 0.5rem;
    border: 1px solid var(--border-color);
}

.countdown-number {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1;
}

.countdown-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-top: 0.25rem;
    font-weight: 500;
}

/* Statistics section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 0rem;
    position: relative;
    z-index: 10;
}

.stat-card {
    padding: 2.5rem 2rem;
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-heading);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-title {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Core timelines (Key Dates) */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background: var(--bg-tertiary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
    border-radius: 2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
    margin-bottom: 2rem;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--bg-primary);
    border: 4px solid var(--color-primary);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
    box-shadow: 0 0 10px var(--color-primary-glow);
}

.timeline-left {
    left: 0;
    text-align: right;
}

.timeline-right {
    left: 50%;
}

.timeline-right::after {
    left: -10px;
}

.timeline-date {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-accent);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-content {
    padding: 1.5rem 2rem;
    position: relative;
}

/* Grid layout for features and tracks */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
    align-items: center;
}

.info-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.info-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.highlight-list {
    list-style: none;
}

.highlight-list li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.highlight-list li i {
    color: var(--color-primary);
}

.tracks-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.track-card {
    padding: 2.5rem;
}

.track-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--color-primary-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.track-card h3 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

.track-topics {
    list-style: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.track-topics li {
    margin-bottom: 0.5rem;
    padding-left: 1.25rem;
    position: relative;
}

.track-topics li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

/* Table styling (Fees / Program) */
.table-container {
    overflow-x: auto;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
    margin: 2rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th,
td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: var(--color-primary-glow);
}

/* Committee section layout */
.committee-section-title {
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.committee-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.committee-card {
    padding: 2rem;
    text-align: center;
}

.committee-card h4 {
    margin-bottom: 0.25rem;
    font-size: 1.2rem;
}

.committee-card .role {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.committee-card .affiliation {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Keynote Speakers layout */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.speaker-card {
    overflow: hidden;
    border-radius: 16px;
}

.speaker-image-wrapper {
    height: 250px;
    background: linear-gradient(135deg, var(--color-primary-glow), var(--color-secondary-glow));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.speaker-image-placeholder {
    font-size: 5rem;
    color: var(--color-primary);
    opacity: 0.5;
}

.speaker-info {
    padding: 2rem;
}

.speaker-name {
    font-size: 1.35rem;
    margin-bottom: 0.25rem;
}

.speaker-title {
    color: var(--color-accent);
    font-weight: 500;
    font-size: 0.85rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.speaker-affiliation {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.speaker-bio {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Contact layout & Forms */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
}

.contact-info-list {
    margin-top: 2rem;
}

.contact-info-item {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.contact-info-item i {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-top: 0.25rem;
}

.contact-info-text h4 {
    margin-bottom: 0.25rem;
}

.contact-info-text p,
.contact-info-text a {
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.85rem 1.25rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

textarea.form-control {
    resize: vertical;
    min-height: 150px;
}

.form-status {
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: none;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-status.success {
    background-color: rgba(16, 185, 129, 0.15);
    border: 1px solid rgb(16, 185, 129);
    color: rgb(16, 185, 129);
    display: block;
}

.form-status.error {
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid rgb(239, 68, 68);
    color: rgb(239, 68, 68);
    display: block;
}

/* Map frame styling */
.map-container {
    height: 400px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    margin-top: 3rem;
}

/* Tourism / Travel Page highlights */
.travel-hero {
    height: 400px;
    background: linear-gradient(180deg, rgba(8, 12, 22, 0.2) 0%, var(--bg-primary) 100%),
        url('../assets/images/kerala_venue.png') no-repeat center center/cover;
    border-radius: 24px;
    margin-bottom: 4rem;
    display: flex;
    align-items: flex-end;
    padding: 3rem;
}

.travel-hero-content {
    max-width: 600px;
}

.travel-hero h2 {
    color: #ffffff;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.travel-hero p {
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.5);
}

.travel-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.travel-card {
    padding: 2rem;
}

.travel-card i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.travel-card h4 {
    margin-bottom: 1rem;
}

.travel-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Footer Section */
.main-footer {
    margin-top: auto;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.footer-socials {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    transform: translateY(-2px);
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.footer-col h4::after {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background-color: var(--color-primary);
    margin-top: 0.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: padding-left var(--transition-fast), color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
}

.footer-bottom-links a {
    color: var(--text-muted);
}

.footer-bottom-links a:hover {
    color: var(--color-primary);
}

/* Callouts / Warnings for academic announcements */
.announcement-banner {
    background: linear-gradient(90deg, var(--color-primary-glow), var(--color-secondary-glow));
    border: 1px solid var(--color-primary);
    border-radius: 12px;
    padding: 1.25rem 2rem;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.announcement-content {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.announcement-content i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.announcement-content p {
    font-weight: 500;
}

/* Page Headers (for inner pages) */
.page-header {
    padding: 7rem 0 4rem 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-bottom: 1px solid var(--border-color);
}

.page-header-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.breadcrumbs {
    display: flex;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.breadcrumbs a {
    color: var(--text-secondary);
}

/* Tab systems for tracks or schedules */
.tabs-header {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2.5rem;
    justify-content: center;
}

.tab-btn {
    padding: 1rem 2rem;
    background: none;
    border: none;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

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

.tab-btn.active::after {
    width: 100%;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }

    .hero-meta {
        justify-content: center;
        margin-bottom: 3.5rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 2rem;
    }

    .speakers-grid,
    .committee-grid,
    .travel-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 3rem 2rem;
        gap: 2rem;
        transition: left var(--transition-normal);
        border-top: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-btn {
        display: block;
    }

    .menu-btn.active span:nth-child(1) {
        transform: rotate(45deg);
        top: 10px;
    }

    .menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg);
        top: 10px;
    }

    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
        text-align: left !important;
    }

    .timeline-item::after {
        left: 21px;
        right: auto;
    }

    .timeline-right {
        left: 0%;
    }

    .info-grid,
    .tracks-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 580px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .speakers-grid,
    .committee-grid,
    .travel-grid {
        grid-template-columns: 1fr;
    }

    .countdown-grid {
        grid-template-columns: repeat(2, 2fr);
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}