/* ============================================
   Simons Observatory F2F 2026 - Main Stylesheet
   Clean, Academic, Modern - SO Brand Adaptation
   ============================================ */

/* CSS Variables for theming */
:root {
    /* Simons Observatory Brand Colors */
    --color-primary: #003A70; /* Deep Navy Blue */
    --color-primary-dark: #002850; /* Darker Navy */
    --color-primary-light: #1a5c9e; /* Lighter Navy */
    --color-secondary: #B84B3E; /* Muted Red Brick */
    --color-accent: #4A90A4; /* Cool Urban Blue - Lake Ontario/Glass */
    --color-accent-light: #7AB8D4; /* Lighter Urban Blue */

    /* UI Colors */
    --color-text: #2c2c2c;
    --color-text-light: #5a5a5a;
    --color-text-muted: #7a7a7a;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fa;
    --color-bg-dark: #001d38;
    --color-border: #d1d9e6;
    --color-border-light: #e8edf5;

    /* Status Colors */
    --color-success: #2d7a3e;
    --color-warning: #c9a227;
    --color-error: #c53d3d;

    /* Typography - Geometric Sans-Serif */
    --font-family-heading: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-family-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 0.875rem;
    --font-size-large: 1.125rem;
    --line-height: 1.6;
    --line-height-heading: 1.15;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --max-width: 1200px;
    --border-radius: 6px;
    --border-radius-sm: 3px;
    --border-radius-lg: 10px;
    --box-shadow: 0 1px 3px rgba(0, 58, 112, 0.08);
    --box-shadow-lg: 0 4px 20px rgba(0, 58, 112, 0.12);
    --box-shadow-xl: 0 8px 40px rgba(0, 58, 112, 0.15);
    --transition: all 0.25s ease;

    /* Header height */
    --header-height: 72px;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family-body);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    line-height: var(--line-height-heading);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h1 { font-size: 2.75rem; font-weight: 800; letter-spacing: -0.03em; }
h2 { font-size: 2.25rem; font-weight: 700; }
h3 { font-size: 1.75rem; font-weight: 700; }
h4 { font-size: 1.375rem; font-weight: 600; }
h5 { font-size: 1.125rem; font-weight: 600; }
h6 { font-size: 1rem; font-weight: 600; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

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

.btn {
    border-bottom: none;
}

ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   HEADER & NAVIGATION - WHITE CLEAN SHEET
   ============================================ */
.site-header {
    background-color: #ffffff;
    color: var(--color-primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header-inner {
    width: 100%;
}

.header-content {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    height: var(--header-height);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.logo {
    color: var(--color-primary);
    text-decoration: none;
    border: none;
    display: flex;
    align-items: center;
    justify-self: start;
}

.logo img {
    max-height: 50px;
    width: auto;
    display: block;
    object-fit: contain;
}

.header-center-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
}

.main-nav {
    justify-self: end;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    gap: 0.5rem;
}

.main-nav a {
    color: var(--color-primary);
    padding: 0.625rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: block;
    font-weight: 600;
    font-size: 0.9375rem;
    letter-spacing: 0.01em;
    border: none;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    background-color: rgba(0, 58, 112, 0.08);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
main {
    flex: 1;
}

/* ============================================
   HERO SECTION - BACKGROUND IMAGE WITH WHITE MIST
   ============================================ */
.hero {
    /* Background image with dark overlay for text readability */
    background:
        /* Dark overlay - gradient from top to bottom */
        linear-gradient(180deg, rgba(0, 8, 20, 0.5) 0%, rgba(0, 29, 56, 0.6) 40%, rgba(0, 58, 112, 0.7) 100%),
        /* Background image */
        url('../img/bg.png') center / cover no-repeat;
    color: white;
    padding: 6rem 0 5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 85vh;
    display: flex;
    align-items: center;
}

/* White Mist Gradient - fades from white navbar into the image */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 25vh;
    background: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.7) 30%, rgba(255, 255, 255, 0.3) 60%, transparent 100%);
    pointer-events: none;
    z-index: 1;
}

/* Main title - prominent and accessible with enhanced text shadow */
.hero h2 {
    color: #FFFFFF;
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    position: relative;
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.8),
        0 4px 12px rgba(0, 0, 0, 0.6),
        0 0 30px rgba(0, 0, 0, 0.4);
    line-height: 1.1;
    z-index: 2;
}

/* Date and location - enhanced text shadows for readability */
.hero-dates {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    margin-bottom: 0.5rem;
    color: #7AB8D4;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.8),
        0 4px 12px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 2;
}

.hero-location {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2.5rem;
    color: #E8EDF5;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.8),
        0 4px 12px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 2;
}

.hero-content {
    margin-bottom: 3rem;
    position: relative;
    z-index: 2;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

/* Countdown Timer - Minimal, no heavy box */
.hero-countdown {
    padding: 2rem 0;
    position: relative;
    margin-top: 1rem;
    z-index: 2;
}

.hero-countdown h3 {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-weight: 500;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    gap: clamp(1.5rem, 4vw, 3rem);
    flex-wrap: wrap;
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
    position: relative;
}

/* Glowing effect behind countdown numbers */
.countdown-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, rgba(122, 184, 212, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
}

.countdown-number {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.25rem;
    font-family: var(--font-family-heading);
    letter-spacing: -0.05em;
    color: #FFFFFF;
    text-shadow: 0 0 30px rgba(122, 184, 212, 0.5);
}

.countdown-label {
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-weight: 500;
}

/* ============================================
   QUICK INFO STRIP
   ============================================ */
.quick-info-strip {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--spacing-lg) 0;
    position: relative;
}

.quick-info-strip::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 50%, var(--color-secondary) 100%);
}

.quick-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.quick-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-align: left;
}

.quick-info-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.quick-info-icon svg {
    width: 24px;
    height: 24px;
    fill: white;
}

.quick-info-content h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin: 0;
    font-weight: 600;
}

.quick-info-content p {
    font-size: 1.0625rem;
    color: var(--color-text);
    margin: 0;
    font-weight: 600;
}

/* Data-line connector */
.quick-info-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -50%;
    top: 50%;
    width: 50%;
    height: 1px;
    background: linear-gradient(90deg, var(--color-border) 0%, transparent 100%);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    font-size: 0.9375rem;
    font-family: var(--font-family-heading);
    letter-spacing: 0.02em;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(184, 75, 62, 0.3);
}

.btn-primary:hover {
    background-color: #c95648;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(184, 75, 62, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-color: rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

/* ============================================
   QUICK LINKS
   ============================================ */
.quick-links {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.quick-links h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

/* Section divider - geometric data line */
.quick-links h2::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.quick-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.quick-link-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    color: var(--color-text);
    display: block;
    border: 1px solid var(--color-border-light);
    border-bottom: 3px solid var(--color-accent);
}

.quick-link-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-lg);
    color: var(--color-text);
    border-bottom-color: var(--color-secondary);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.quick-link-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.quick-link-card p {
    color: var(--color-text-light);
}

/* ============================================
   NEWS / ANNOUNCEMENTS
   ============================================ */
.news {
    padding: var(--spacing-3xl) 0;
}

.news h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.news h2::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-item {
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    border-left: 4px solid var(--color-secondary);
    transition: var(--transition);
}

.news-item:hover {
    box-shadow: var(--box-shadow);
    transform: translateX(4px);
}

.news-item time {
    color: var(--color-accent);
    font-size: var(--font-size-small);
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.news-item h3 {
    margin-bottom: var(--spacing-sm);
}

.news-link {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-sm);
    font-weight: 600;
    border: none;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.about h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.about-content p {
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
    font-size: 1.125rem;
    line-height: 1.8;
}

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
    border-bottom: 3px solid var(--color-secondary);
}

.page-header h1 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    opacity: 0.9;
    margin: 0;
}

/* ============================================
   SCHEDULE
   ============================================ */
.schedule {
    padding: var(--spacing-3xl) 0;
}

.schedule-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.schedule-nav-btn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--color-primary);
    background-color: transparent;
    color: var(--color-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-family: var(--font-family-heading);
}

.schedule-nav-btn:hover {
    background-color: var(--color-primary);
    color: white;
}

.schedule-nav-btn.active {
    background-color: var(--color-primary);
    color: white;
}

.schedule-day {
    display: block;
}

.schedule-day h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.schedule-sessions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.schedule-session {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    transition: var(--transition);
    border: 1px solid var(--color-border-light);
}

.schedule-session:hover {
    box-shadow: var(--box-shadow);
    border-color: var(--color-accent);
}

.schedule-session.break {
    background-color: #e8edf5;
}

.schedule-session.break .session-content h3 {
    color: var(--color-text-muted);
    font-style: italic;
}

.session-time {
    font-weight: 700;
    color: var(--color-secondary);
    font-size: 1.125rem;
    font-family: var(--font-family-heading);
}

.session-content h3 {
    margin-bottom: var(--spacing-xs);
}

.session-speaker {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-xs);
}

.session-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
}

.session-location {
    color: var(--color-accent);
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
}

.schedule-download {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg-alt);
    text-align: center;
}

.schedule-download .btn {
    margin-left: var(--spacing-md);
}

/* ============================================
   REGISTRATION
   ============================================ */
.registration-info {
    padding: var(--spacing-3xl) 0;
}

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

.info-card {
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
}

.info-card.important {
    border: 2px solid var(--color-secondary);
}

.info-card h2 {
    margin-bottom: var(--spacing-lg);
}

.dates-list {
    list-style: none;
    margin: 0;
}

.dates-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.date-label {
    color: var(--color-text-light);
    display: block;
    font-size: var(--font-size-small);
}

.pricing-table {
    margin-bottom: var(--spacing-md);
}

.price-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.price-student {
    border-top: 2px solid var(--color-secondary);
    padding-top: var(--spacing-sm);
    font-weight: 600;
}

.price-amount {
    font-weight: 700;
    color: var(--color-secondary);
}

.pricing-note {
    font-size: var(--font-size-small);
    color: var(--color-text-light);
    margin: 0;
}

/* Registration Form */
.registration-form-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.form-intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-muted);
}

.registration-form {
    max-width: 700px;
    margin: 0 auto;
    background-color: white;
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--color-border-light);
}

.registration-form fieldset {
    border: none;
    padding: 0;
    margin: 0 0 var(--spacing-xl);
}

.registration-form legend {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    padding: 0;
    font-family: var(--font-family-heading);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9375rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--color-bg);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 58, 112, 0.1);
}

.checkbox-group label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    margin-top: 4px;
}

.form-submit {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.form-note {
    text-align: center;
    font-size: var(--font-size-small);
    color: var(--color-text-light);
    margin-top: var(--spacing-md);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Cancellation Policy */
.cancellation-policy {
    padding: var(--spacing-3xl) 0;
}

.cancellation-policy h2,
.visa-info h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.policy-list {
    max-width: 700px;
    margin: 0 auto;
    list-style: none;
}

.policy-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.policy-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-size: 1.5rem;
    line-height: 1;
}

.visa-info {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.visa-content {
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================
   LOCAL GUIDE
   ============================================ */
.guide-nav {
    background-color: var(--color-primary);
    padding: var(--spacing-lg) 0;
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    border-bottom: 3px solid var(--color-secondary);
}

.guide-nav-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.guide-nav-links a {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    border: none;
}

.guide-nav-links a:hover {
    color: white;
}

.guide-section {
    padding: var(--spacing-3xl) 0;
}

.guide-section:nth-child(even) {
    background-color: var(--color-bg-alt);
}

.guide-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

/* Venue Card */
.venue-card {
    max-width: 700px;
    margin: 0 auto;
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--color-border-light);
}

.venue-card h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.venue-card address {
    font-style: normal;
    margin-bottom: var(--spacing-lg);
}

.venue-details,
.venue-access {
    margin-top: var(--spacing-lg);
}

.venue-details h4,
.venue-access h4 {
    margin-bottom: var(--spacing-sm);
}

/* Hotels Grid */
.hotels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.hotel-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

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

.hotel-card h3 {
    margin-bottom: var(--spacing-xs);
}

.hotel-rating {
    color: var(--color-warning);
    margin-bottom: var(--spacing-sm);
}

.hotel-address,
.hotel-distance {
    color: var(--color-text-light);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-xs);
}

.hotel-price {
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.hotel-features {
    list-style: none;
    margin: 0;
}

.hotel-features li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    font-size: var(--font-size-small);
}

.hotel-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
}

/* Transportation */
.transport-sections {
    display: grid;
    gap: var(--spacing-xl);
}

.transport-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow);
}

.transport-icon {
    font-size: 1.5rem;
}

.transport-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.transport-card h4 {
    margin-bottom: var(--spacing-md);
}

.transport-card ul {
    list-style: none;
    margin: 0;
}

.transport-card li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.transport-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

/* Dining Grid */
.dining-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.dining-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow);
}

.dining-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
}

.dining-card ul {
    list-style: none;
    margin: 0;
}

.dining-card li {
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-small);
}

/* Attractions Grid */
.attractions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.attraction-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow);
}

.attraction-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
}

.attraction-card ul {
    list-style: none;
    margin: 0;
}

.attraction-card li {
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-small);
}

/* Practical Info */
.practical-info {
    background-color: var(--color-primary);
    color: white;
}

.practical-info h2 {
    color: white;
}

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

.practical-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--color-border-light);
}

.practical-card h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.practical-card p {
    margin-bottom: var(--spacing-sm);
}

.practical-card ul {
    list-style: none;
    margin: 0;
}

.practical-card li {
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-small);
}

/* ============================================
   PARTICIPANTS
   ============================================ */
.participants-search {
    padding: var(--spacing-2xl) 0;
    background-color: var(--color-bg-alt);
}

.search-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 175px;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: white;
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 58, 112, 0.1);
}

.filter-group select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    min-width: 200px;
    background-color: white;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 58, 112, 0.1);
}

.results-count {
    text-align: center;
    color: var(--color-text-muted);
}

.participants-list {
    padding: var(--spacing-3xl) 0;
}

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

.participant-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 1px solid var(--color-border-light);
}

.participant-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
    border-color: var(--color-accent);
}

.participant-name {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-family-heading);
}

.participant-institution {
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-sm);
}

.participant-status {
    display: inline-block;
    padding: 0.3125rem 0.875rem;
    background-color: var(--color-bg-alt);
    border-radius: 20px;
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
    font-weight: 500;
    border: 1px solid var(--color-border);
}

/* View Toggle */
.view-toggle {
    display: flex;
    gap: 2px;
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    padding: 2px;
}

.view-btn {
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: calc(var(--border-radius) - 2px);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-btn svg {
    fill: var(--color-text-muted);
    transition: var(--transition);
}

.view-btn:hover svg {
    fill: var(--color-text);
}

.view-btn.active {
    background-color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.view-btn.active svg {
    fill: var(--color-primary);
}

/* List View */
.participants-list.list-view .participants-grid {
    display: block;
}

.participants-list.list-view .participant-card {
    display: grid;
    grid-template-columns: 1fr 1fr 150px;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
}

.participants-list.list-view .participant-card:hover {
    transform: none;
}

.participants-list.list-view .participant-name {
    margin-bottom: 0;
}

.participants-list.list-view .participant-institution {
    margin-bottom: 0;
}

.participants-list.list-view .participant-status {
    justify-self: end;
}

.no-results {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-muted);
}

/* ============================================
   SPONSORS
   ============================================ */
.sponsors {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
    text-align: center;
}

.sponsors h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: var(--spacing-xl);
}

.sponsors h2::after {
    display: none;
}

.sponsors-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

.sponsor-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    opacity: 0.8;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.sponsor-logo:hover {
    opacity: 1;
    transform: translateY(-2px);
}

.sponsor-logo img {
    max-height: 80px;
    width: auto;
    display: block;
    object-fit: contain;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background-color: #0a2540;
    color: rgba(255, 255, 255, 0.85);
    padding: 3rem 0 2rem;
    border-top: 2px solid rgba(100, 116, 139, 0.3);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1rem;
    font-weight: 700;
    font-size: 1.0625rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer-section p {
    color: #cbd5e1; /* Light gray for better readability */
    line-height: 1.75;
}

.footer-section ul {
    list-style: none;
    margin: 0;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #cbd5e1; /* Light gray for better readability */
    border: none;
    transition: color 0.2s ease;
}

.footer-section a:hover {
    color: #d25f45; /* Burnt orange hover state */
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    margin: 0;
    font-size: var(--font-size-small);
    color: #94a3b8; /* Muted gray for copyright */
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    /* Header */
    .header-content {
        grid-template-columns: auto 1fr auto;
        padding: 0 var(--spacing-md);
    }

    .header-center-text {
        display: none;
    }

    .logo {
        margin-right: auto;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-nav {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: #ffffff;
        padding: var(--spacing-md);
        display: none;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
    }

    .main-nav a {
        padding: var(--spacing-md);
        border-radius: var(--border-radius-sm);
    }

    /* Hero */
    .hero {
        padding: 4rem 0 3rem;
        min-height: 70vh;
    }

    .hero h2 {
        font-size: 1.75rem;
    }

    .hero-dates {
        font-size: 1rem;
        letter-spacing: 0.1em;
    }

    .hero-location {
        font-size: 0.9375rem;
    }

    .countdown-timer {
        gap: 1rem;
    }

    .countdown-item {
        min-width: 55px;
    }

    .countdown-item::before {
        width: 60px;
        height: 60px;
    }

    .countdown-number {
        font-size: 2rem;
    }

    .countdown-label {
        font-size: 0.625rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    /* Schedule */
    .schedule-session {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .session-time {
        font-size: 1rem;
    }

    /* Registration Form */
    .registration-form {
        padding: var(--spacing-lg);
    }

    /* Guide Nav */
    .guide-nav {
        position: static;
    }

    .guide-nav-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Sponsors */
    .sponsors-grid {
        gap: var(--spacing-xl);
    }

    .sponsor-logo img {
        max-height: 60px;
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
    }

    /* Participants search controls */
    .search-controls {
        flex-direction: column;
    }

    .search-box {
        min-width: 100%;
    }

    .filter-group select {
        min-width: 100%;
    }

    .view-toggle {
        align-self: flex-end;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .hero {
        padding: 3rem 0 2rem;
        min-height: 60vh;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .hero-dates {
        font-size: 0.875rem;
        letter-spacing: 0.08em;
    }

    .hero-location {
        font-size: 0.875rem;
        margin-bottom: 2rem;
    }

    .quick-links,
    .news,
    .about,
    .schedule,
    .registration-info,
    .registration-form-section,
    .cancellation-policy,
    .visa-info,
    .participants-list {
        padding: var(--spacing-xl) 0;
    }

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

    .hotels-grid,
    .dining-grid,
    .attractions-grid,
    .practical-grid {
        grid-template-columns: 1fr;
    }

    .participants-grid {
        grid-template-columns: 1fr;
    }

    /* List view on mobile falls back to card-like layout */
    .participants-list.list-view .participant-card {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .participants-list.list-view .participant-status {
        justify-self: start;
    }
}