/* ============================================
   IRENA LTES Forum - Main Stylesheet
   Professional Design System
   ============================================ */

/* ============================================
   CSS Variables & Design Tokens
   ============================================ */
:root {
    /* Brand Colors */
    --color-primary: #00203e;
    --color-primary-light: #004466;
    --color-accent: #dd082b;
    --color-accent-hover: #c7072a;
    --color-teal: #4A90A4;
    --color-teal-light: #67B3C7;

    /* Hero specific */
    --hero-gradient-start: #001f3d;
    --hero-gradient-end: #003a5c;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #FAFBFC;
    --color-gray-100: #F4F6F8;
    --color-gray-200: #E5E8EB;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #6B7280;
    --color-gray-700: #4B5563;
    --color-gray-800: #262626;
    --color-gray-900: #171717;

    /* Typography */
    --font-primary: 'Poppins', Arial, sans-serif;
    --font-display: 'Montserrat', Helvetica, sans-serif;

    /* Font Sizes - Fluid Typography */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);
    --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
    --text-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.25rem);
    --text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
    --text-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1280px;
    --container-padding: var(--space-6);

    /* Section Spacing */
    --section-padding: 80px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: 400;
    line-height: 1.65;
    color: var(--color-gray-800);
    background: var(--color-white);
}

p {
    margin-bottom: var(--space-6);
    font-weight: 400;
    line-height: 1.7;
    color: #444;
}

.section p {
    text-align: left;
}

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

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

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6,
nav a,
.header__logo,
.cta-button,
.nav__link,
.nav__cta,
.hero__cta,
.btn {
    font-family: var(--font-display);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--text-5xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

h2 {
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--space-5);
}

h3 { font-size: var(--text-3xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
h5 { font-size: var(--text-lg); margin-bottom: var(--space-2); }

p {
    margin-bottom: var(--space-4);
    font-weight: 400;
    line-height: 1.7;
    color: #444;
}

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

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

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    background: rgba(0, 32, 62, 0.98);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
    height: 72px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header__container {
    height: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.header__logo-section {
    background: #ffffff;
    height: 100%;
    width: 33.333%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    padding: 0 2rem;
}

.header__logo-img {
    height: 45px;
    width: auto;
    object-fit: contain;
}

.header__portal-badge {
    background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
    color: var(--color-white);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(73, 140, 164, 0.3);
}

.header__logo {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.01em;
}

.nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    padding-right: 2rem;
}

.nav__list {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0 0 0 3rem;
    height: 100%;
}

.nav__link {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    text-transform: none;
    padding: 0.5rem 0;
    line-height: 1.5;
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav__link:hover {
    color: var(--color-white);
}

.nav__link:hover::after {
    width: 100%;
}

.nav__cta {
    background: #dd082b;
    color: white;
    padding: 6px 18px;
    border-radius: 3px;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.5;
    border: none;
    margin-left: 1rem;
    transition: all 0.3s ease;
}

.nav__cta:hover {
    background: #c7072a;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(221, 8, 43, 0.3);
    color: white;
}

.nav__cta::after {
    display: none;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: var(--text-2xl);
    cursor: pointer;
    padding: var(--space-2);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    background: linear-gradient(135deg, #002644 0%, #003d5c 50%, #004d6b 100%);
    color: var(--color-white);
    padding: 80px var(--container-padding);
    min-height: 600px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(73, 140, 164, 0.1), transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 100px 100px;
    pointer-events: none;
}

.hero__container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero__portal-welcome {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--color-white);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.hero__title {
    color: #ffffff;
    font-size: clamp(2.5rem, 4vw, 4rem);
    font-weight: 700;
    margin-bottom: 2rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.hero__meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin: 2rem 0;
    font-size: 1.1rem;
}

.hero__meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.95);
}

.hero__meta-icon {
    display: inline-flex;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 1.2rem;
}

.hero__cta {
    display: inline-block;
    background: #dd082b;
    color: white;
    padding: 12px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    margin-top: 2rem;
    transition: all 0.3s ease;
    text-decoration: none;
}

.hero__cta:hover {
    background: #c7072a;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(221, 8, 43, 0.3);
    color: white;
}

.hero__logos {
    display: none;
}

.hero__logo-img {
    height: 100px;
    width: auto;
    object-fit: contain;
    opacity: 0.9;
    transition: all var(--transition-base);
}

.hero__logo-img:hover {
    opacity: 1;
}

/* ============================================
   Countdown Timer
   ============================================ */
.countdown {
    margin-top: 3rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.countdown__label {
    font-size: var(--text-lg);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

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

.countdown__segment {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.countdown__value {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-white);
    font-family: var(--font-display);
    line-height: 1;
    min-width: 2ch;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
}

.countdown__unit {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.countdown__separator {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1;
    margin-top: -1.5rem;
}

.countdown--finished .countdown__label {
    font-size: var(--text-2xl);
}

.countdown--finished .countdown__timer {
    display: none;
}

@media (max-width: 768px) {
    .hero__logo-img {
        height: 40px;
    }

    .hero__logos {
        gap: 1.5rem;
        padding: 1.5rem;
    }

    .countdown {
        padding: 1.5rem;
        margin-top: 2rem;
    }

    .countdown__timer {
        gap: 0.5rem;
    }

    .countdown__value {
        padding: 0.25rem 0.5rem;
    }

    .countdown__separator {
        margin-top: -1rem;
    }
}

/* ============================================
   Container & Sections
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding-top: var(--section-padding);
    padding-bottom: var(--section-padding);
    position: relative;
    overflow: hidden;
}

.section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 40%;
    height: 200%;
    background: radial-gradient(circle, rgba(73,140,164,0.05) 0%, transparent 70%);
    pointer-events: none;
}

.section--gray {
    background: var(--color-gray-50);
}

#agenda::before,
#logistics::before {
    display: none;
}

.section__header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-20);
}

.section__eyebrow {
    display: inline-block;
    background: transparent;
    color: #aaa;
    border: none;
    padding: 0;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-4);
}

.section__title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #222;
    margin-bottom: 1.5rem;
}

.section__description {
    font-size: 0.95rem;
    font-weight: 400;
    line-height: 1.7;
    color: #444;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

/* ============================================
   Session Cards
   ============================================ */
.sessions {
    display: grid;
    gap: var(--space-8);
}

.session {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all var(--transition-base);
    border: none;
    box-shadow:
        0 1px 3px rgba(0,0,0,0.02),
        0 4px 12px rgba(0,32,62,0.08);
    position: relative;
    overflow: hidden;
}

.session::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, #498CA4 0%, #5fa7bf 100%);
}

.session--clickable {
    cursor: pointer;
}

.session--clickable:hover {
    transform: translateY(-8px);
    box-shadow:
        0 4px 8px rgba(0,0,0,0.04),
        0 12px 24px rgba(0,32,62,0.12);
}

.session:hover {
    transform: translateY(-8px);
    box-shadow:
        0 4px 8px rgba(0,0,0,0.04),
        0 12px 24px rgba(0,32,62,0.12);
}

.session__header {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
    align-items: flex-start;
}

.session__number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #498CA4 0%, #3a7a91 100%);
    color: var(--color-white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(73,140,164,0.3);
}

.session__info {
    flex: 1;
}

.session__meta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}

.session__title {
    font-size: var(--text-xl);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
    font-weight: 600;
    line-height: 1.3;
}

.session__cohost {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    font-style: italic;
}

.session__description {
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: 0;
}

.session__speakers-compact {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-gray-200);
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    line-height: 1.6;
}

.session__speakers-compact strong {
    color: var(--color-primary);
    font-weight: 700;
    display: block;
    margin-bottom: var(--space-2);
}

.session__speakers-compact span {
    margin-right: var(--space-1);
}

/* ============================================
   Speaker Carousel
   ============================================ */
.speakers-carousel {
    position: relative;
    margin: 0 auto;
    max-width: 100%;
    padding: 0 60px;
}

.speakers-viewport {
    overflow: hidden;
    width: 100%;
}

.speakers-track {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-4) 0;
    transition: transform 0.5s ease;
}

.speaker-card {
    flex: 0 0 220px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
}

.speaker-card:hover {
    transform: translateY(-8px);
}

.speaker-card__image {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto var(--space-4);
}

.speaker-card__image img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-white);
    box-shadow: 0 4px 12px rgba(0, 32, 62, 0.15);
    transition: all var(--transition-base);
}

.speaker-card:hover .speaker-card__image img {
    border-color: var(--color-teal);
    box-shadow: 0 8px 24px rgba(73, 140, 164, 0.3);
}

.speaker-card__placeholder {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
    color: var(--color-white);
    font-size: var(--text-3xl);
    font-weight: 700;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--color-white);
    box-shadow: 0 4px 12px rgba(0, 32, 62, 0.15);
}

.speaker-card__name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.speaker-card__org {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    line-height: 1.4;
    text-align: center !important;
    margin: 0 auto;
    width: 100%;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-white);
    border: 2px solid var(--color-gray-300);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 2rem;
    color: var(--color-primary);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.carousel-btn:hover {
    background: var(--color-teal);
    border-color: var(--color-teal);
    color: var(--color-white);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn--prev {
    left: 0;
}

.carousel-btn--next {
    right: 0;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-gray-300);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.carousel-dot.active {
    background: var(--color-teal);
    width: 30px;
    border-radius: 5px;
}

/* ============================================
   Speaker Modal
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
}

.modal.is-open {
    display: block;
}

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn 0.3s ease;
}

.modal__content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease;
}

.modal__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-gray-100);
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-gray-600);
    z-index: 10;
}

.modal__close:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: rotate(90deg);
}

.modal__body {
    padding: var(--space-12);
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-8);
    align-items: start;
}

.modal__image {
    position: relative;
    width: 200px;
    height: 200px;
}

.modal__image img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--color-teal);
    box-shadow: 0 8px 24px rgba(0, 32, 62, 0.2);
}

.modal__placeholder {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
    color: var(--color-white);
    font-size: 4rem;
    font-weight: 700;
    align-items: center;
    justify-content: center;
    border: 5px solid var(--color-teal);
    box-shadow: 0 8px 24px rgba(0, 32, 62, 0.2);
}

.modal__info {
    min-width: 0;
}

.modal__name {
    font-size: var(--text-3xl);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
    line-height: 1.2;
}

.modal__title {
    font-size: var(--text-lg);
    color: var(--color-teal);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.modal__institution {
    font-size: var(--text-base);
    color: var(--color-gray-600);
    margin-bottom: var(--space-6);
}

.modal__bio {
    font-size: var(--text-base);
    color: var(--color-gray-700);
    line-height: 1.7;
}

.modal__bio p {
    margin-bottom: var(--space-4);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translate(-50%, -40%);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

/* ============================================
   Session Modal Styles
   ============================================ */
.modal--session .modal__content {
    max-width: 1000px;
}

.modal__content--wide {
    max-width: 1000px;
}

.modal__body--session {
    display: block;
    padding: var(--space-12);
}

.session-modal__header {
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 2px solid var(--color-gray-200);
}

.session__number--large {
    width: 72px;
    height: 72px;
    font-size: var(--text-3xl);
    flex-shrink: 0;
}

.session-modal__content {
    display: grid;
    gap: var(--space-8);
}

.session-modal__section {
    background: var(--color-gray-50);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-teal);
}

.session-modal__section-title {
    font-size: var(--text-xl);
    color: var(--color-primary);
    margin-bottom: var(--space-4);
    font-weight: 600;
}

.session-modal__section h4 {
    font-size: var(--text-lg);
    color: var(--color-primary);
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
    font-weight: 600;
}

.session-modal__section p {
    color: var(--color-gray-700);
    line-height: 1.7;
    margin-bottom: var(--space-3);
}

.session-modal__section ul {
    list-style-position: inside;
    color: var(--color-gray-700);
    line-height: 1.7;
    padding-left: var(--space-4);
}

.session-modal__section li {
    margin-bottom: var(--space-2);
}

/* ============================================
   Document Cards
   ============================================ */
.documents {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-8);
}

.document {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-10);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-200);
}

.document:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
    border-color: var(--color-gray-300);
}

.document__icon {
    font-size: 4rem;
    margin-bottom: var(--space-6);
    filter: grayscale(0.2);
}

.document__title {
    font-size: var(--text-xl);
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.document__description {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn--primary {
    background: #dd082b;
    color: white;
}

.btn--primary:hover {
    background: #c7072a;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(221, 8, 43, 0.3);
    color: white;
}

.btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn__icon {
    margin-right: 0.5rem;
}

/* ============================================
   Calendar Button
   ============================================ */
.btn-calendar {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
    color: var(--color-white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(73, 140, 164, 0.3);
}

.btn-calendar:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(73, 140, 164, 0.4);
    background: linear-gradient(135deg, var(--color-teal-light), var(--color-teal));
}

.btn-calendar__icon {
    font-size: 1.25rem;
}

.btn-calendar__text {
    font-weight: 600;
}

.btn-calendar--large {
    padding: 1rem 2rem;
    font-size: var(--text-lg);
}

.agenda-actions {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-10);
}

@media (max-width: 768px) {
    .btn-calendar--large {
        padding: 0.875rem 1.5rem;
        font-size: var(--text-base);
    }
}

/* ============================================
   Alert & Info Boxes
   ============================================ */
.alert {
    background: var(--color-gray-50);
    border-left: 6px solid var(--color-teal);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin: var(--space-8) 0;
    box-shadow: var(--shadow-sm);
}

.alert__title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.alert__content {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    line-height: 1.6;
}

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

/* ============================================
   Publications Grid
   ============================================ */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-10);
}

.publication {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.publication:hover {
    transform: translateY(-8px);
    box-shadow:
        0 8px 16px rgba(0, 0, 0, 0.08),
        0 16px 32px rgba(0, 32, 62, 0.15);
}

.publication__image {
    width: 100%;
    height: 400px;
    overflow: hidden;
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.publication__image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform var(--transition-base);
}

.publication:hover .publication__image img {
    transform: scale(1.02);
}

.publication__content {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.publication__year {
    display: inline-block;
    background: var(--color-teal);
    color: var(--color-white);
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-3);
    width: fit-content;
}

.publication__title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.publication__description {
    font-size: var(--text-base);
    color: var(--color-gray-600);
    line-height: 1.6;
    margin-bottom: var(--space-6);
    flex-grow: 1;
}

.publication .btn {
    align-self: flex-start;
    margin-top: auto;
}

/* ============================================
   Video Container
   ============================================ */
.online-join-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-12);
    text-align: center;
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.05),
        0 10px 20px rgba(0, 32, 62, 0.1);
    max-width: 700px;
    margin: 0 auto;
}

.online-join-card__icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
}

.online-join-card__title {
    font-size: var(--text-2xl);
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.online-join-card__description {
    font-size: var(--text-base);
    color: var(--color-gray-700);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

.online-join-card__note {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-gray-200);
}

.btn--large {
    padding: 1rem 2.5rem;
    font-size: var(--text-lg);
    font-weight: 600;
}

/* ============================================
   Contact Grid
   ============================================ */
.contacts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

.contact {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-fast);
}

.contact:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-gray-300);
}

.contact__title {
    font-size: var(--text-base);
    color: var(--color-teal);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.contact__name {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.contact__detail {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ============================================
   Agenda Lists
   ============================================ */
.agenda__day {
    margin-bottom: var(--space-12);
}

.agenda__day-title {
    color: var(--color-teal);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-6);
}

.agenda__list {
    list-style: none;
    display: grid;
    gap: var(--space-4);
}

.agenda__item {
    padding-left: var(--space-6);
    border-left: 3px solid var(--color-gray-200);
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
    transition: border-color var(--transition-fast);
}

.agenda__item:hover {
    border-left-color: var(--color-teal);
}

.agenda__item strong {
    color: var(--color-primary);
    font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: linear-gradient(180deg, #001528 0%, #000d1a 100%);
    color: var(--color-white);
    padding: var(--space-16) var(--container-padding);
    margin-top: var(--space-24);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.footer__container {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer__title {
    color: var(--color-white);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
}

.footer__content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-3);
}

.footer__links {
    margin-top: var(--space-6);
}

.footer__links a {
    color: var(--color-teal-light);
}

.footer__links a:hover {
    color: var(--color-white);
}

.footer__copyright {
    margin-top: var(--space-8);
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--text-sm);
}

/* ============================================
   Theme Grid
   ============================================ */
.themes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
}

.theme {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.theme::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-teal);
    transition: height var(--transition-base);
}

.theme:hover {
    border-color: var(--color-teal);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.theme:hover::before {
    height: 8px;
}

.theme__title {
    color: var(--color-primary);
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
    font-weight: 600;
}

.theme__description {
    color: var(--color-gray-600);
    font-size: var(--text-sm);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-4);
    }

    .mobile-toggle {
        display: block;
        position: absolute;
        right: 1rem;
        z-index: 10;
        color: var(--color-primary);
    }

    .header__logo-section {
        width: 100%;
        justify-content: flex-start;
        padding: 0 1rem;
        gap: 0.75rem;
    }

    .header__logo-img {
        height: 35px;
    }

    .header__portal-badge {
        font-size: 0.6rem;
        padding: 0.25rem 0.5rem;
    }

    .hero__portal-welcome {
        font-size: 0.75rem;
        padding: 0.5rem 1rem;
        letter-spacing: 0.05em;
    }

    .nav {
        position: absolute;
        right: 0;
        top: 72px;
        width: 100%;
        padding: 0;
    }

    .nav__list {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        width: 100%;
        background: #00203e !important;
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        box-shadow: var(--shadow-xl);
        z-index: 999;
        min-height: calc(100vh - 72px);
    }

    .nav__list.is-active {
        display: flex !important;
    }

    .nav__link {
        color: rgba(255, 255, 255, 0.95);
        padding: 0.75rem 1rem;
        border-radius: var(--radius-sm);
    }

    .nav__link:hover {
        background: rgba(255, 255, 255, 0.1);
        color: var(--color-white);
    }

    .nav__link::after {
        display: none;
    }

    .nav__cta {
        margin-left: 0;
        text-align: center;
    }

    .hero {
        min-height: auto;
        padding: 60px 20px;
    }

    .hero__title {
        font-size: 2rem;
        line-height: 1.2;
    }

    .hero__meta {
        flex-direction: column;
        gap: 1rem;
    }

    .section {
        padding: var(--space-12) 0;
    }

    .session__header {
        flex-direction: column;
    }

    .documents,
    .contacts,
    .themes {
        grid-template-columns: 1fr !important;
    }

    /* Carousel mobile adjustments */
    .speakers-carousel {
        padding: 0 40px;
    }

    .speaker-card {
        flex: 0 0 200px;
    }

    .speaker-card__image {
        width: 120px;
        height: 120px;
    }

    .carousel-btn {
        width: 36px;
        height: 36px;
        font-size: 1.5rem;
    }

    /* Modal mobile adjustments */
    .modal__content {
        width: 95%;
        max-height: 95vh;
    }

    .modal__body {
        grid-template-columns: 1fr;
        padding: var(--space-8);
        text-align: center;
    }

    .modal__image {
        margin: 0 auto;
    }

    .modal__close {
        top: 0.5rem;
        right: 0.5rem;
    }

    .publications-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .publication__image {
        height: 300px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    /* Header adjustments for tablet */
    .header__logo-section {
        width: 25%;
        min-width: 200px;
    }

    .nav {
        padding-right: 1rem;
    }

    .nav__list {
        gap: 1rem;
        padding-left: 2rem;
    }

    .nav__link {
        font-size: 0.85rem;
    }

    /* Container uses more width on tablet */
    .container {
        max-width: 95%;
    }

    /* Grid adjustments */
    .documents {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

    /* Speakers carousel */
    .speaker-card {
        flex: 0 0 200px;
    }

    /* Hero adjustments */
    .hero__meta {
        gap: 2rem;
        font-size: 1rem;
    }

    /* Sessions */
    .session__title {
        font-size: var(--text-lg);
    }
}

@media (min-width: 1025px) and (max-width: 1366px) {
    /* Laptop and large tablet landscape */
    .header__logo-section {
        width: 28%;
    }

    .nav__list {
        gap: 1.5rem;
        padding-left: 2.5rem;
    }

    .container {
        max-width: 100%;
        padding: 0 3rem;
    }

    .publications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Staggered animation for session cards */
.session {
    animation: fadeInUp 0.5s ease-out;
    animation-fill-mode: both;
}

.session:nth-child(1) { animation-delay: 0.1s; }
.session:nth-child(2) { animation-delay: 0.2s; }
.session:nth-child(3) { animation-delay: 0.3s; }
.session:nth-child(4) { animation-delay: 0.4s; }
.session:nth-child(5) { animation-delay: 0.5s; }
.session:nth-child(6) { animation-delay: 0.6s; }
.session:nth-child(7) { animation-delay: 0.7s; }
.session:nth-child(8) { animation-delay: 0.8s; }

/* ============================================
   Accessibility - Focus States
   ============================================ */
a:focus,
button:focus,
.nav__link:focus,
.nav__cta:focus,
.hero__cta:focus {
    outline: 2px solid #fff;
    outline-offset: 3px;
}

.section a:focus,
.btn:focus {
    outline: 2px solid #2980b9;
    outline-offset: 3px;
}

/* ============================================
   Content Wrapper
   ============================================ */
.content-wrapper {
    max-width: 100%;
}

.logistics__heading {
    color: var(--color-teal);
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
    margin-top: var(--space-8);
}

.logistics__heading:first-child {
    margin-top: 0;
}

.logistics__text {
    margin-bottom: var(--space-8);
}

.logistics__list {
    margin-bottom: var(--space-8);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}