/* ===== AUS-Inspired Theme for FMSE 2026 ===== */
/* Based on American University of Sharjah Design Guidelines */
/* Primary: Orange-Red (AUS Brand Color) */

:root {
    /* AUS Primary Colors - Orange/Red Theme */
    --aus-primary: #c44536;
    --aus-primary-dark: #9e372b;
    --aus-primary-light: #d4685c;
    --aus-secondary: #772e25;
    --aus-accent: #e8a87c;
    --aus-accent-light: #f5d0b5;
    
    /* Neutral Colors */
    --aus-gray-dark: #2d2d2d;
    --aus-gray: #555555;
    --aus-gray-light: #888888;
    --aus-gray-lighter: #e0e0e0;
    --aus-white: #ffffff;
    --aus-off-white: #faf8f6;
    
    /* Status Colors */
    --aus-success: #2e7d32;
    --aus-error: #c41e3a;
    
    /* Typography */
    --font-primary: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Montserrat', 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(196, 69, 54, 0.08);
    --shadow-md: 0 4px 12px rgba(196, 69, 54, 0.12);
    --shadow-lg: 0 8px 24px rgba(196, 69, 54, 0.16);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--aus-gray-dark);
    background-color: var(--aus-white);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--aus-secondary);
}

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

a:hover {
    color: var(--aus-primary-dark);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Navigation - Always on Top ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--aus-white);
    border-bottom: 3px solid var(--aus-primary);
    z-index: 99999;
    padding: 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--aus-primary);
    letter-spacing: -0.3px;
}

.logo:hover {
    color: var(--aus-primary-dark);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    margin: 0;
}

.nav-link {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--aus-gray-dark);
    padding: 8px 0;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--aus-primary);
    transition: var(--transition-normal);
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--aus-primary);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--aus-primary);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* ===== Hero Section with Image Slider ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: var(--aus-secondary);
    padding: 120px var(--spacing-md) 80px;
    overflow: hidden;
}

/* Hero Image Slider */
.hero-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-slider .slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transform: scale(1.1);
    transition: opacity 1.5s ease-in-out, transform 8s ease-out;
}

.hero-slider .slide.active {
    opacity: 1;
    transform: scale(1);
}

.hero-slider .slide.prev {
    opacity: 0;
    transform: scale(1);
}

/* Ken Burns effect */
@keyframes kenBurns {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.hero-slider .slide.active {
    animation: kenBurns 8s ease-out forwards;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(119, 46, 37, 0.92) 0%,
        rgba(196, 69, 54, 0.88) 50%,
        rgba(119, 46, 37, 0.92) 100%
    );
    z-index: 1;
}

.hero-overlay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.04)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    pointer-events: none;
}

.hero-wrapper {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 900px;
    width: 100%;
}

.hero-content {
    color: var(--aus-white);
    text-align: center;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--aus-white);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero h2 {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--aus-accent-light);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 8px;
    opacity: 0.95;
    font-style: italic;
}
.hero-date {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--aus-white);
}

.hero-location {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}
.hero-description {
    color: rgba(255,255,255,0.95);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: 2rem;
    padding: 0 1rem;
    text-align: center;
}
.hero-description p {
    margin-bottom: 0.5rem;
}
.hero-description p:last-child {
    margin-bottom: 0;
}
.hero-description .mt-1 {
    margin-top: 0.75rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-family: var(--font-primary);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 2px solid transparent;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition-normal);
}

.btn-primary {
    background: var(--aus-accent);
    color: var(--aus-secondary);
    border-color: var(--aus-accent);
}

.btn-primary:hover {
    background: var(--aus-accent-light);
    border-color: var(--aus-accent-light);
    color: var(--aus-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-submit {
    background: var(--aus-primary);
    color: var(--aus-white);
    border-color: var(--aus-primary);
    width: 100%;
    padding: 14px;
    font-size: 0.85rem;
}

.btn-submit:hover {
    background: var(--aus-primary-dark);
    border-color: var(--aus-primary-dark);
}

/* ===== Section Styles ===== */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    color: var(--aus-gray);
    line-height: 1.6;
}
.section-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--aus-secondary);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--aus-primary);
}

/* ===== Home Symposium Description ===== */
.home-description-section {
    background: var(--aus-white);
}

.home-description-content {
    max-width: 800px;
    margin: 0 auto;
}

.home-description-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
    color: var(--aus-gray-dark);
}

.home-description-content p:last-child {
    margin-bottom: 0;
}

/* ===== Keynote Speakers ===== */
.keynote-section {
    background: var(--aus-off-white);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.speaker-card {
    background: var(--aus-white);
    border: 1px solid var(--aus-gray-lighter);
    overflow: hidden;
    transition: var(--transition-normal);
}

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

.speaker-image {
    width: 100%;
    height: 280px;
    overflow: hidden;
    background: var(--aus-gray-lighter);
}

.speaker-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.speaker-card:hover .speaker-image img {
    transform: scale(1.05);
}

.speaker-info {
    padding: var(--spacing-md);
    border-top: 3px solid var(--aus-primary);
}

.speaker-info h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--aus-secondary);
    margin-bottom: 4px;
}

.speaker-affiliation {
    font-size: 0.75rem;
    color: var(--aus-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.speaker-bio {
    font-size: 0.8rem;
    color: var(--aus-gray);
    line-height: 1.6;
}

/* ===== Invited Speakers ===== */
.invited-section {
    background: var(--aus-white);
}

.invited-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.invited-card {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--aus-off-white);
    border: 1px solid var(--aus-gray-lighter);
    transition: var(--transition-normal);
}

.invited-card:hover {
    border-color: var(--aus-primary);
    box-shadow: var(--shadow-md);
}

.invited-image {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--aus-primary);
}

.invited-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.invited-card h4 {
    font-size: 0.85rem;
    color: var(--aus-secondary);
    margin-bottom: 2px;
    font-weight: 600;
}

.invited-card p {
    font-size: 0.7rem;
    color: var(--aus-gray);
}

/* ===== Program Section ===== */
.program-section {
    background: var(--aus-off-white);
}

.program-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.program-day {
    background: var(--aus-white);
    border: 1px solid var(--aus-gray-lighter);
    padding: var(--spacing-lg);
}

.program-day h3 {
    font-size: 0.95rem;
    color: var(--aus-secondary);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--aus-primary);
}

.program-day h3 i {
    margin-right: var(--spacing-sm);
    color: var(--aus-primary);
}

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

.program-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--aus-gray-lighter);
    font-size: 0.8rem;
}

.program-list li:last-child {
    border-bottom: none;
}

.program-list .time {
    font-weight: 600;
    color: var(--aus-primary);
    margin-right: var(--spacing-sm);
    display: inline-block;
    min-width: 100px;
}

/* ===== Registration Section ===== */
.registration-section {
    background: var(--aus-white);
}

.registration-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.deadlines h3,
.fees h3 {
    font-size: 1.1rem;
    color: var(--aus-secondary);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--aus-primary);
}

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

.deadline-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--aus-gray-lighter);
}

.deadline-list li i {
    font-size: 1.3rem;
    color: var(--aus-primary);
    margin-top: 4px;
}

.deadline-list li strong {
    display: block;
    color: var(--aus-secondary);
    font-weight: 600;
    margin-bottom: 2px;
}

.deadline-list li span {
    color: var(--aus-gray);
    font-size: 0.9rem;
}

.fee-table {
    border: 1px solid var(--aus-gray-lighter);
}

.fee-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--aus-gray-lighter);
    font-size: 0.95rem;
}

.fee-row:last-child {
    border-bottom: none;
}

.fee-row.header {
    background: var(--aus-primary);
    color: var(--aus-white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.85rem;
}

.fee-row span:not(:first-child) {
    text-align: center;
}

/* ===== Form Section ===== */
.submission-section {
    background: var(--aus-primary);
    color: var(--aus-white);
}

.submission-section .section-title {
    color: var(--aus-white);
}

.submission-section .section-title::after {
    background: var(--aus-accent);
}

.form-container {
    max-width: 700px;
    margin: 0 auto;
}

.form-intro {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    opacity: 0.9;
}
.form-intro + .form-intro {
    margin-top: 0.25rem;
}

.abstract-form {
    background: var(--aus-white);
    padding: var(--spacing-xl);
    border: none;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    color: var(--aus-secondary);
    font-size: 0.8rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--aus-gray-lighter);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    color: var(--aus-gray-dark);
    transition: var(--transition-fast);
    border-radius: 0;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--aus-primary);
    box-shadow: 0 0 0 2px rgba(196, 69, 54, 0.15);
}

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

.char-count {
    display: block;
    text-align: right;
    font-size: 0.8rem;
    color: var(--aus-gray);
    margin-top: 4px;
}

.checkbox-group label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-weight: 400;
    font-size: 0.9rem;
    color: var(--aus-gray-dark);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 3px;
    accent-color: var(--aus-primary);
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background: #d4edda;
    color: var(--aus-success);
    border: 1px solid var(--aus-success);
}

.form-message.error {
    background: #f8d7da;
    color: var(--aus-error);
    border: 1px solid var(--aus-error);
}

/* ===== Accommodation Section ===== */
.accommodation-section {
    background: var(--aus-off-white);
}

.accommodation-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

/* Abstracts Section */
.abstracts-section {
    background: var(--aus-off-white);
}
.abstracts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}
.abstract-card {
    background: var(--aus-white);
    padding: var(--spacing-lg);
    border: 1px solid var(--aus-gray-lighter);
    border-left: 4px solid var(--aus-primary);
}
.abstract-card h4 {
    color: var(--aus-secondary);
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
}
.abstract-card .abstract-title {
    font-weight: 600;
    color: var(--aus-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}
.abstract-card p {
    color: var(--aus-gray-dark);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}
.abstract-card p:last-child {
    margin-bottom: 0;
}

.info-card {
    background: var(--aus-white);
    padding: var(--spacing-lg);
    border: 1px solid var(--aus-gray-lighter);
    border-top: 3px solid var(--aus-primary);
}

.info-card h3 {
    font-size: 1rem;
    color: var(--aus-secondary);
    margin-bottom: var(--spacing-xs);
}

.info-card h3 i {
    margin-right: var(--spacing-sm);
    color: var(--aus-primary);
}

.info-card p {
    color: var(--aus-gray);
    margin-bottom: var(--spacing-xs);
    font-size: 0.85rem;
}

.info-card ul {
    list-style: none;
}

.info-card ul li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    color: var(--aus-gray-dark);
    font-size: 0.8rem;
}

.info-card ul li::before {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--aus-primary);
}

/* ===== Sponsors Section (Organizers) ===== */
.sponsors-section {
    background: var(--aus-white);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--aus-gray-lighter);
}

.organizing-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.organizing-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--aus-secondary);
}

.organizing-subtitle {
    opacity: 0.9;
    color: var(--aus-gray);
}

.organizing-chairs,
.organizing-committee {
    margin-top: 1.25rem;
    font-size: 0.95rem;
    color: var(--aus-gray-dark);
}

.organizing-committee {
    margin-top: 0.25rem;
}

.sponsors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
    justify-items: center;
}

.sponsor-logo {
    padding: var(--spacing-sm);
    opacity: 0.7;
    transition: var(--transition-normal);
    filter: grayscale(30%);
}

.sponsor-logo:hover {
    opacity: 1;
    filter: grayscale(0%);
}

.sponsor-logo img {
    max-height: 70px;
    width: auto;
    object-fit: contain;
}

/* ===== Footer ===== */
.footer {
    background: var(--aus-secondary);
    color: var(--aus-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-info h3 {
    font-size: 1rem;
    color: var(--aus-white);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    opacity: 0.8;
    font-size: 0.85rem;
}

.footer-logo {
    margin-top: var(--spacing-md);
}

.footer-logo img {
    max-width: 80px;
    opacity: 0.9;
}

.footer-contact h4,
.footer-social h4 {
    font-size: 0.85rem;
    color: var(--aus-accent);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-contact p {
    margin-bottom: 6px;
    opacity: 0.8;
    font-size: 0.8rem;
}

.footer-contact p i {
    width: 20px;
    margin-right: var(--spacing-sm);
    color: var(--aus-accent);
}

.footer-contact a {
    color: var(--aus-accent);
}

.footer-contact a:hover {
    color: var(--aus-accent-light);
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--aus-white);
    font-size: 1rem;
    transition: var(--transition-normal);
}

.social-links a:hover {
    background: var(--aus-primary);
    color: var(--aus-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.3rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--aus-white);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        box-shadow: var(--shadow-lg);
        display: none;
        border-top: 1px solid var(--aus-gray-lighter);
        z-index: 99998;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-link {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--aus-gray-lighter);
    }
    
    .hero {
        min-height: auto;
        padding: 100px var(--spacing-md) 60px;
    }
    
    .hero-description {
        margin-top: 1.5rem;
        padding: 0 0.5rem;
        font-size: 0.85rem;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .hero h2 {
        font-size: 1.1rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .abstract-form {
        padding: var(--spacing-md);
    }
    
    .registration-content {
        grid-template-columns: 1fr;
    }
    
    .program-list .time {
        min-width: 70px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero h1 {
        font-size: 1.3rem;
    }
    
    .hero-description {
        margin-top: 1rem;
        font-size: 0.8rem;
    }
    
    .section-title {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.8rem;
    }
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-primary { color: var(--aus-primary); }
.text-secondary { color: var(--aus-secondary); }
.bg-primary { background-color: var(--aus-primary); }
.bg-secondary { background-color: var(--aus-secondary); }

/* ===== Animation Classes ===== */
.visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}