/* ========================================
   RESET & BASE STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* MIREA Official Colors */
    --color-primary: #3d5a99;
    --color-primary-dark: #2d4577;
    --color-primary-light: #5a7ab8;
    --color-secondary: #4a9bd6;
    --color-accent: #50c8e8;
    --color-gradient-start: #3d5a99;
    --color-gradient-middle: #4a7cb8;
    --color-gradient-end: #50c8e8;

    /* Neutral Colors */
    --color-dark: #2c3e50;
    --color-dark-soft: #3d4f61;
    --color-gray: #6b7a99;
    --color-gray-light: #e8edf5;
    --color-white: #ffffff;
    --color-bg: #f7f9fc;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(61, 90, 153, 0.08);
    --shadow-md: 0 4px 16px rgba(61, 90, 153, 0.12);
    --shadow-lg: 0 8px 32px rgba(61, 90, 153, 0.16);
    --shadow-card: 0 2px 12px rgba(61, 90, 153, 0.1);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

/* ========================================
   NAVIGATION
   ======================================== */

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

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 60px;
    width: auto;
    max-width: 220px;
    object-fit: contain;
}

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-dark);
    margin: 3px 0;
    transition: var(--transition-fast);
    border-radius: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

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

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

.btn-register {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-register:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-middle) 50%, var(--color-gradient-end) 100%);
    opacity: 1;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 15% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(80, 200, 232, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(74, 155, 214, 0.1) 0%, transparent 60%);
}

.hero-content {
    text-align: center;
    color: var(--color-white);
    max-width: 900px;
    padding: var(--spacing-lg) 0;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    font-weight: 300;
}

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

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.info-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    color: var(--color-white);
}

.info-icon svg {
    width: 40px;
    height: 40px;
    filter: drop-shadow(0 3px 8px rgba(0, 0, 0, 0.4));
}

.info-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.info-label {
    font-size: 0.75rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.info-value {
    font-size: 1.1rem;
    font-weight: 600;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
    font-size: 1rem;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-white);
    box-shadow: 0 4px 16px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.2);
}

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

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-white);
    opacity: 0.8;
}

.scroll-indicator span {
    display: block;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-arrow {
    width: 30px;
    height: 30px;
    border-right: 2px solid var(--color-white);
    border-bottom: 2px solid var(--color-white);
    transform: rotate(45deg);
    margin: 0 auto;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(-10px) rotate(45deg);
    }
    60% {
        transform: translateY(-5px) rotate(45deg);
    }
}

/* ========================================
   SECTIONS
   ======================================== */

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

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.8rem);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

/* ========================================
   ABOUT SECTION
   ======================================== */

.section-about {
    background-color: var(--color-white);
}

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

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

.about-card--wide {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.about-card--wide .card-icon,
.about-card--wide h3 {
    text-align: center;
}

.about-card-body--cols ul {
    column-count: 2;
    column-gap: var(--spacing-lg);
}

.about-card-body--cols ul li {
    break-inside: avoid;
}

.about-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--color-gray-light);
    box-shadow: var(--shadow-card);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-secondary);
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.card-icon svg {
    width: 48px;
    height: 48px;
}

.about-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.about-card p {
    color: var(--color-gray);
    line-height: 1.7;
}

.about-card-body {
    color: var(--color-gray);
    line-height: 1.7;
}

.about-card-body p {
    margin: 0 0 var(--spacing-sm);
}

.about-card-body p:last-child {
    margin-bottom: 0;
}

.about-card-body ul {
    list-style: disc;
    padding-left: 1.2em;
    margin: var(--spacing-xs) 0 0;
    text-align: left;
}

.about-card-body ul li {
    margin-bottom: 0.4rem;
}

.about-card-body ul li:last-child {
    margin-bottom: 0;
}

.about-detailed-text {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    margin-top: var(--spacing-lg);
}

.about-detailed-text h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    text-align: center;
}

.about-detailed-text h4 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.about-detailed-text p {
    color: var(--color-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    text-align: justify;
}

.about-detailed-text ul,
.about-detailed-text ol {
    color: var(--color-gray);
    line-height: 1.8;
    margin: 0 0 var(--spacing-md);
    padding-left: 1.4em;
}

.about-detailed-text ul li,
.about-detailed-text ol li {
    margin-bottom: var(--spacing-xs);
}

.about-detailed-text ul li:last-child,
.about-detailed-text ol li:last-child {
    margin-bottom: 0;
}

.trends-list {
    margin-top: var(--spacing-md);
    display: grid;
    gap: var(--spacing-md);
}

.trend-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    transition: all var(--transition-normal);
}

.trend-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--color-secondary);
}

.trend-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.trend-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
}

.trend-header h5 {
    font-size: 1.3rem;
    color: var(--color-dark);
    font-weight: 700;
    margin: 0;
}

.trend-content p {
    color: var(--color-gray);
    line-height: 1.7;
    margin: 0;
}

/* ========================================
   PROGRAM SECTION
   ======================================== */

.section-program {
    background-color: var(--color-bg);
}

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

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-white);
    border: 2px solid var(--color-gray-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-dark);
}

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

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

.program-day {
    display: none;
}

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

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

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

.timeline::before {
    content: '';
    position: absolute;
    left: 140px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}

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

.timeline-time {
    flex-shrink: 0;
    width: 110px;
    font-weight: 700;
    color: var(--color-primary);
    padding-top: var(--spacing-sm);
    text-align: right;
    font-size: 1rem;
    padding-right: var(--spacing-sm);
}

.timeline-content {
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    flex: 1;
    position: relative;
    transition: all var(--transition-normal);
    margin-left: var(--spacing-sm);
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 24px;
    width: 14px;
    height: 14px;
    background-color: var(--color-primary);
    border: 3px solid var(--color-white);
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--color-primary-light);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.timeline-content h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-dark);
}

.timeline-content p {
    color: var(--color-gray);
    margin-bottom: var(--spacing-xs);
}

.timeline-location {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--color-primary);
    background: rgba(0, 102, 204, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
}

.sections-grid {
    margin-top: var(--spacing-xl);
}

.program-intro {
    text-align: center;
    color: var(--color-gray);
    font-size: 1.05rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.sections-grid h3 {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
}

.sections-list {
    display: grid;
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.section-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

.section-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.section-circle {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
}

.section-num {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
}

.section-content-right {
    flex: 1;
    text-align: left;
}

.section-content-right h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.5px;
}

.section-content-right p {
    color: var(--color-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* ========================================
   SUBMISSION SECTION
   ======================================== */

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

.submission-stacked {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.submission-block {
    width: 100%;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.submission-dates-block {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-middle));
    color: var(--color-white);
}

.submission-dates-block h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

.submission-requirements-block {
    background: var(--color-bg);
}

.submission-requirements-block h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-dark);
}

.dates-list {
    margin-bottom: var(--spacing-lg);
}

.date-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    gap: var(--spacing-sm);
}

.date-item:last-child {
    border-bottom: none;
}

.date-label {
    opacity: 0.9;
}

.date-value {
    font-weight: 700;
}

.submission-actions-standalone {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.submission-actions-standalone .btn {
    text-align: center;
    min-width: 200px;
}

.submission-actions-standalone .btn-outline {
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    transition: all var(--transition-normal);
}

.submission-actions-standalone .btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.submission-actions-standalone .btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border: none;
    transition: all var(--transition-normal);
}

.submission-actions-standalone .btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.requirements-section {
    padding: var(--spacing-md) 0;
}

.req-intro {
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.requirements-detailed-list {
    list-style: none;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.requirements-detailed-list li {
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.7;
}

.requirements-detailed-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.requirements-detailed-list li.spacing-item {
    font-style: italic;
    color: var(--color-primary);
    margin: var(--spacing-sm) 0;
}

.requirements-detailed-list li.spacing-item::before {
    content: '';
}

/* Нумерованный список в требованиях */
.requirements-section ol {
    list-style: none;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    counter-reset: item;
}

.requirements-section ol li {
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.7;
    counter-increment: item;
}

.requirements-section ol li::before {
    content: counter(item) '.';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.requirements-section h4 {
    color: var(--color-dark);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.requirements-warning {
    background: #fff3cd;
    border-left: 4px solid #ff6b00;
    padding: var(--spacing-md);
    color: var(--color-dark);
    line-height: 1.7;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
}

/* ========================================
   PARTNERS SECTION (GRID)
   ======================================== */

.section-partners {
    background-color: var(--color-bg);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.partner-item {
    background: var(--color-white);
    padding: calc(var(--spacing-xl) * 1.5);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 220px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

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

.partner-logo {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

.become-partner {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.become-partner h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
}

.become-partner p {
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

/* ========================================
   REGISTRATION SECTION
   ======================================== */

.section-register {
    background-color: var(--color-white);
}

.register-form-fullwidth {
    max-width: 1000px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(61, 90, 153, 0.03), rgba(74, 155, 214, 0.03));
    padding: calc(var(--spacing-xl) * 1.5);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(61, 90, 153, 0.1);
}

.register-form-fullwidth form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.register-form-fullwidth .form-group:nth-last-child(2),
.register-form-fullwidth .form-group:nth-last-child(1),
.register-form-fullwidth .btn-full {
    grid-column: 1 / -1;
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: calc(var(--spacing-sm) + 4px);
    border: 2px solid rgba(61, 90, 153, 0.2);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(61, 90, 153, 0.1);
    background: var(--color-white);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 400;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.form-group input[type="file"] {
    display: none;
}

.form-group .file-upload-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

.form-group .file-upload-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.form-group .file-upload-label:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.form-group .file-upload-label::before {
    content: '⬆';
    font-size: 1rem;
}

.form-group .file-name-display {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--color-gray);
    font-size: 0.9rem;
    font-style: italic;
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--color-gray);
    font-style: italic;
}

.btn-full {
    width: 100%;
}

.register-form-fullwidth .btn-full {
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    font-weight: 600;
    padding: calc(var(--spacing-md) + 4px);
    transition: all var(--transition-normal);
}

.register-form-fullwidth .btn-full:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   CONTACTS SECTION
   ======================================== */

.section-contacts {
    background-color: var(--color-bg);
}

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

.contact-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.contact-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.contact-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark);
}

.contact-card a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.contact-card a:hover {
    color: var(--color-primary-dark);
}

.contact-card p {
    color: var(--color-gray);
}

.organizers {
    margin-bottom: var(--spacing-xl);
}

.organizers h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
}

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

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

.organizer-card h4 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.organizer-name {
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-dark);
}

.organizer-position {
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

.organizer-card a {
    color: var(--color-primary);
    text-decoration: none;
}

.map-section h3 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-dark);
}

.yandex-map {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.yandex-map > div,
.yandex-map iframe {
    border-radius: var(--radius-xl);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.footer-section p {
    color: var(--color-gray-light);
    line-height: 1.7;
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--color-gray-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--color-primary-light);
}

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

.social-link {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-primary);
    transform: translateY(-3px);
}

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--color-white);
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-md);
        padding: var(--spacing-md) 0;
    }

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

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column;
    }

    .timeline-time {
        width: 100%;
        text-align: left;
        padding-left: 60px;
    }

    .timeline-content::before {
        left: -50px;
    }

    .register-form-fullwidth {
        padding: var(--spacing-lg);
    }

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

    .about-grid,
    .about-grid--two {
        grid-template-columns: 1fr;
    }

    .about-card-body--cols ul {
        column-count: 1;
    }

    .submission-actions-standalone {
        flex-direction: column;
    }

    .submission-actions-standalone .btn {
        width: 100%;
    }

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

    .trends-list {
        gap: var(--spacing-md);
    }

    .program-tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        flex: 1 1 45%;
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-title {
        font-size: 1.5rem;
        line-height: 1.3;
    }

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

    .info-item {
        justify-content: center;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
        margin-bottom: calc(var(--spacing-xl) + 40px);
    }

    .hero-actions .btn {
        width: 100%;
        padding: var(--spacing-md);
    }

    .scroll-indicator {
        bottom: var(--spacing-md);
        font-size: 0.75rem;
    }

    .scroll-indicator span {
        font-size: 0.7rem;
    }

    .scroll-arrow {
        width: 24px;
        height: 24px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .about-card h3 {
        font-size: 1.2rem;
    }

    .about-detailed-text p,
    .about-detailed-text h4 {
        font-size: 0.95rem;
    }

    .trend-item {
        padding: var(--spacing-md);
    }

    .trend-label {
        font-size: 0.7rem;
    }

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

    .sections-cards,
    .contacts-grid,
    .organizers-grid {
        grid-template-columns: 1fr;
    }

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

    .partner-item {
        min-height: 100px;
        padding: var(--spacing-md);
    }

    .partner-logo {
        width: 100%;
        max-height: 70px;
    }

    .modal-header h3 {
        font-size: 1.2rem;
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    .submission-block {
        padding: var(--spacing-md);
    }

    .submission-block h3 {
        font-size: 1.1rem;
    }

    .requirements-detailed-list {
        padding-left: var(--spacing-xs);
        font-size: 0.9rem;
    }

    .date-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xs);
    }

    .register-form-fullwidth {
        padding: var(--spacing-md);
    }

    .form-group label {
        font-size: 0.9rem;
    }

    .form-group input,
    .form-group select {
        font-size: 0.95rem;
    }

    .file-upload-label {
        font-size: 0.9rem;
        padding: var(--spacing-sm);
    }

    .tab-btn {
        flex: 1 1 100%;
        font-size: 0.9rem;
        padding: var(--spacing-sm);
    }

    .timeline-item {
        padding-left: 40px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-time {
        padding-left: 40px;
        font-size: 0.9rem;
    }

    .timeline-content h4 {
        font-size: 1rem;
    }

    .timeline-content::before {
        left: -36px;
        width: 14px;
        height: 14px;
    }

    .section-circle {
        width: 50px;
        height: 50px;
    }

    .section-num {
        font-size: 1.2rem;
    }

    .section-content-right h4 {
        font-size: 1rem;
    }

    .section-content-right p {
        font-size: 0.9rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .social-links {
        justify-content: center;
    }
}

/* ========================================
   UTILITIES
   ======================================== */

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

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

/* ========================================
   PRIVACY POLICY MODAL
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-light);
}

.modal-header h3 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 50%;
    transition: all var(--transition-fast);
    color: var(--color-gray);
}

.modal-close:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    line-height: 1.8;
}

.modal-body h4 {
    color: var(--color-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.modal-body h4:first-child {
    margin-top: 0;
}

.modal-body p {
    color: var(--color-gray);
    margin-bottom: var(--spacing-md);
    white-space: pre-line;
}

.privacy-link {
    color: var(--color-primary);
    text-decoration: underline;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.privacy-link:hover {
    color: var(--color-secondary);
}

/* ========================================
   COOKIE NOTICE
   ======================================== */

.cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-lg);
    z-index: 9999;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
}

.cookie-notice.visible {
    transform: translateY(0);
}

.cookie-notice-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cookie-notice p {
    margin: 0;
    flex: 1;
    min-width: 300px;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-gray-light);
}

.cookie-notice-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-shrink: 0;
}

.cookie-notice .btn-small {
    padding: 8px 20px;
    font-size: 0.85rem;
}

.cookie-more-link {
    color: var(--color-gray-light);
    text-decoration: underline;
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

.cookie-more-link:hover {
    color: var(--color-white);
}

@media (max-width: 640px) {
    .cookie-notice {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .cookie-notice-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }

    .cookie-notice p {
        min-width: auto;
        font-size: 0.85rem;
    }

    .cookie-notice-buttons {
        width: 100%;
        justify-content: center;
    }
}

/* ========================================
   PARTNER LOGOS
   ======================================== */

.partner-item a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.partner-logo {
    max-width: 100%;
    max-height: 140px;
    height: auto;
    object-fit: contain;
}

/* ========================================
   ABOUT — Strategic directions
   ======================================== */

.about-strategy {
    margin-top: var(--spacing-lg);
}

.about-strategy h4 {
    margin-bottom: var(--spacing-md);
}

.about-strategy .strategy-intro {
    margin: 0 0 var(--spacing-md);
    color: var(--color-gray);
    font-size: 1.05rem;
    line-height: 1.6;
}

.strategy-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

@media (max-width: 768px) {
    .strategy-list {
        grid-template-columns: 1fr;
    }
}

.strategy-item {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.strategy-item h5 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.05rem;
    color: var(--color-primary);
}

.strategy-item p {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.55;
}

/* ========================================
   HACKATHON SECTION
   ======================================== */

.section-hackathon {
    background-color: var(--color-white);
}

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

.hackathon-subtitle {
    font-size: 1.15rem;
    color: var(--color-dark);
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.5;
}

.hackathon-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.hackathon-meta-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
}

.hackathon-meta-item strong {
    color: var(--color-primary);
    margin-right: 0.35rem;
}

.hackathon-intro {
    max-width: 960px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.65;
}

.hackathon-intro p {
    margin: 0 0 var(--spacing-sm);
}

.hackathon-goals {
    margin-bottom: var(--spacing-lg);
}

.hackathon-goals h3,
.hackathon-selection h3,
.hackathon-concepts h3,
.hackathon-program-title {
    text-align: center;
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.goals-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.goal-item {
    display: grid;
    grid-template-columns: 56px 1fr;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.goal-num {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    text-align: center;
}

.goal-text {
    font-size: 1rem;
    line-height: 1.55;
    color: var(--color-dark);
}

@media (max-width: 768px) {
    .goals-list {
        grid-template-columns: 1fr;
    }
}

.hackathon-selection {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.hackathon-selection p {
    margin: 0;
    line-height: 1.6;
}

.timeline-empty {
    text-align: center;
    color: var(--color-gray, #666);
    font-style: italic;
    padding: var(--spacing-md);
}

.concepts-table-wrapper {
    overflow-x: auto;
    margin-top: var(--spacing-md);
}

.concepts-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.concepts-table th,
.concepts-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-gray-light);
    vertical-align: top;
}

.concepts-table th {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
}

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

.concepts-table tr:nth-child(even) td {
    background: var(--color-bg);
}

@media (max-width: 768px) {
    .hackathon-meta {
        flex-direction: column;
        align-items: center;
    }
    .concepts-table th,
    .concepts-table td {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }
}