/* ============================================
   SEPEHR — Smart Flight Competition
   Modern, RTL, Themed Stylesheet
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
    /* Light Theme (default) */
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e4ecf4;
    --bg-hero-start: #caf0f8;
    --bg-hero-mid: #90e0ef;
    --bg-hero-end: #0077b6;
    --text-primary: #1a1a2e;
    --text-secondary: #3a3a5c;
    --text-muted: #6b7280;
    --accent-primary: #0077b6;
    --accent-secondary: #00b4d8;
    --accent-tertiary: #90e0ef;
    --accent-glow: rgba(0, 119, 182, 0.25);
    --card-bg: rgba(255, 255, 255, 0.72);
    --card-border: rgba(255, 255, 255, 0.55);
    --card-hover: rgba(255, 255, 255, 0.9);
    --nav-bg: rgba(240, 244, 248, 0.82);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.1);
    --gradient-primary: linear-gradient(135deg, #0077b6, #00b4d8);
    --gradient-secondary: linear-gradient(135deg, #00b4d8, #90e0ef);
    --gradient-text: linear-gradient(135deg, #023e8a, #0077b6, #00b4d8);
    --border-radius: 16px;
    --border-radius-sm: 10px;
    --border-radius-xs: 6px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Vazirmatn', system-ui, -apple-system, sans-serif;

    /* Safety colors */
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.08);
    --danger-border: rgba(239, 68, 68, 0.25);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.08);
    --warning-border: rgba(245, 158, 11, 0.25);

    /* Level colors */
    --level-1: #22c55e;
    --level-2: #f59e0b;
    --level-3: #ef4444;
}

[data-theme="dark"] {
    --bg-primary: #070714;
    --bg-secondary: #0f0f28;
    --bg-tertiary: #161636;
    --bg-hero-start: #070714;
    --bg-hero-mid: #0a1628;
    --bg-hero-end: #023e8a;
    --text-primary: #e8e8f8;
    --text-secondary: #b0b0cc;
    --text-muted: #7878a0;
    --accent-primary: #00b4d8;
    --accent-secondary: #48cae4;
    --accent-tertiary: #023e8a;
    --accent-glow: rgba(0, 180, 216, 0.2);
    --card-bg: rgba(15, 15, 45, 0.65);
    --card-border: rgba(40, 40, 100, 0.4);
    --card-hover: rgba(20, 20, 60, 0.85);
    --nav-bg: rgba(7, 7, 20, 0.88);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.25);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.35);
    --gradient-primary: linear-gradient(135deg, #00b4d8, #48cae4);
    --gradient-secondary: linear-gradient(135deg, #023e8a, #0077b6);
    --gradient-text: linear-gradient(135deg, #48cae4, #90e0ef, #caf0f8);

    --danger-bg: rgba(239, 68, 68, 0.12);
    --danger-border: rgba(239, 68, 68, 0.3);
    --warning-bg: rgba(245, 158, 11, 0.12);
    --warning-border: rgba(245, 158, 11, 0.3);
}

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

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

body {
    font-family: var(--font);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.85;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent-primary);
    color: #fff;
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 10px;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* ---------- Container ---------- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Glass Card ---------- */
.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 32px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: var(--shadow-md);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.glass-card:hover {
    box-shadow: var(--shadow-lg);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 14px 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}
.navbar.scrolled {
    padding: 10px 0;
    border-bottom-color: var(--card-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--accent-primary);
    transition: color var(--transition);
}
.nav-brand:hover {
    color: var(--accent-secondary);
}
.nav-drone-icon {
    color: var(--accent-primary);
}
.nav-drone-icon .propeller {
    animation: propSpin 0.4s linear infinite;
    transform-origin: center;
}
@keyframes propSpin {
    0% { transform: scaleX(1); }
    50% { transform: scaleX(-1); }
    100% { transform: scaleX(1); }
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
    position: relative;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
    background: var(--accent-glow);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition);
    position: relative;
}
.theme-toggle:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    box-shadow: 0 0 20px var(--accent-glow);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: all 0.4s ease;
}
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}
.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 100px 24px 60px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        160deg,
        var(--bg-hero-start) 0%,
        var(--bg-hero-mid) 40%,
        var(--bg-hero-end) 100%
    );
    opacity: 0.3;
    animation: heroGradientShift 12s ease-in-out infinite alternate;
}
@keyframes heroGradientShift {
    0% { opacity: 0.25; filter: hue-rotate(0deg); }
    100% { opacity: 0.4; filter: hue-rotate(15deg); }
}

.hero-grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--accent-primary) 1px, transparent 1px),
        linear-gradient(90deg, var(--accent-primary) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.03;
    animation: gridScroll 30s linear infinite;
}
@keyframes gridScroll {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

/* Floating shapes */
.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-primary);
    opacity: 0.06;
    filter: blur(1px);
}
.shape-1 {
    width: 300px; height: 300px;
    top: 10%; right: -5%;
    animation: float1 18s ease-in-out infinite;
}
.shape-2 {
    width: 200px; height: 200px;
    bottom: 15%; left: 5%;
    animation: float2 22s ease-in-out infinite;
    background: var(--accent-secondary);
}
.shape-3 {
    width: 120px; height: 120px;
    top: 50%; left: 20%;
    animation: float3 15s ease-in-out infinite;
}
.shape-4 {
    width: 80px; height: 80px;
    top: 25%; left: 60%;
    animation: float1 20s ease-in-out infinite reverse;
    background: var(--accent-tertiary);
    opacity: 0.08;
}
.shape-5 {
    width: 160px; height: 160px;
    bottom: 10%; right: 15%;
    animation: float2 17s ease-in-out infinite;
    opacity: 0.05;
}
.shape-6 {
    width: 60px; height: 60px;
    top: 15%; left: 40%;
    animation: float3 12s ease-in-out infinite;
    background: var(--accent-secondary);
    opacity: 0.1;
}
@keyframes float1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -40px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}
@keyframes float2 {
    0%, 100% { transform: translate(0, 0) rotate(0); }
    50% { transform: translate(-30px, -30px) rotate(10deg); }
}
@keyframes float3 {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(20px, -20px); }
    75% { transform: translate(-15px, 15px); }
}

/* Hero drone animation */
.hero-drone-anim {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 0;
    pointer-events: none;
    animation: droneFly 8s ease-in-out infinite;
}
@keyframes droneFly {
    0%, 100% { transform: translate(-50%, -50%) translateY(0); }
    25% { transform: translate(-50%, -50%) translateY(-15px) translateX(10px); }
    50% { transform: translate(-50%, -50%) translateY(5px) translateX(-8px); }
    75% { transform: translate(-50%, -50%) translateY(-10px) translateX(5px); }
}
.hero-drone-anim .prop {
    animation: propSpin 0.3s linear infinite;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    margin-bottom: 24px;
}
.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-primary);
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.4); }
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    line-height: 1.9;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-stats {
    display: inline-flex;
    align-items: center;
    gap: 24px;
    padding: 20px 36px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 60px;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}
.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}
.stat-num {
    font-size: 1.8rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}
.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--card-border);
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
    opacity: 0.5;
    transition: opacity var(--transition);
}
.scroll-mouse:hover {
    opacity: 1;
}
.scroll-dot {
    width: 4px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 4px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollAnim 2s ease-in-out infinite;
}
@keyframes scrollAnim {
    0% { top: 6px; opacity: 1; }
    100% { top: 22px; opacity: 0; }
}

/* ============================================
   SECTIONS — General
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
}
.section--intro {
    background: var(--bg-secondary);
}
.section--constraints {
    background: var(--bg-primary);
}
.section--hardware {
    background: var(--bg-secondary);
}
.section--scoring {
    background: var(--bg-primary);
}
.section--teams {
    background: var(--bg-secondary);
    padding: 80px 0;
}
.section--scenarios {
    background: var(--bg-primary);
}
.section--safety {
    background: var(--bg-secondary);
}
.section--video {
    background: var(--bg-primary);
    padding: 80px 0;
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    padding: 4px 16px;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 50px;
    margin-bottom: 16px;
    letter-spacing: 1px;
}
.section-header h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.4;
}
.header-line {
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 4px;
    margin: 0 auto;
}

/* ============================================
   INTRODUCTION SECTION
   ============================================ */
.intro-lead,
.intro-mission {
    margin-bottom: 32px;
}
.intro-lead p,
.intro-mission p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 2;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 28px;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition);
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-glow);
}
.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: #fff;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.95;
}

/* Exhibition highlight */
.exhibition-highlight {
    display: flex;
    gap: 0;
    margin-bottom: 32px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
}
.highlight-accent {
    width: 5px;
    min-height: 100%;
    background: var(--gradient-primary);
    flex-shrink: 0;
}
.highlight-content {
    padding: 28px 32px;
}
.highlight-content p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 2;
}

.intro-closing {
    text-align: center;
    padding: 40px 0 0;
}
.intro-closing p {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-primary);
    position: relative;
    display: inline-block;
}

/* ============================================
   VIDEO SECTION
   ============================================ */
.video-wrapper {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.competition-video {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--border-radius-sm);
    background: var(--bg-tertiary);
    outline: none;
    display: block;
}

.competition-video:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 4px;
}

@media (max-width: 768px) {
    .video-wrapper {
        padding: 16px;
    }
}

/* ============================================
   CONSTRAINTS SECTION
   ============================================ */
.constraints-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.constraint-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
}
.constraint-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}
.constraint-item p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   HARDWARE SECTION
   ============================================ */
.hardware-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 48px;
}
.hardware-intro p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 2;
}

.hardware-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.hardware-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 36px 28px;
    text-align: center;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.hardware-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.hardware-number {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent-primary);
    opacity: 0.1;
    line-height: 1;
}

.hardware-icon {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #fff;
    box-shadow: 0 8px 24px var(--accent-glow);
    transition: transform var(--transition);
}
.hardware-card:hover .hardware-icon {
    transform: scale(1.08) rotate(-3deg);
}

.hardware-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.hardware-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.hardware-api {
    text-align: center;
}
.hardware-api p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 2;
}

/* ============================================
   SCORING SECTION
   ============================================ */
.scoring-layout {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    align-items: start;
    margin-bottom: 48px;
}

.scoring-main p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 16px;
}
.scoring-main p:last-child {
    margin-bottom: 0;
}

.scoring-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.score-ring {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.score-ring svg {
    filter: drop-shadow(0 4px 12px var(--accent-glow));
}
.score-progress {
    transition: stroke-dasharray 1.5s ease;
}
.score-ring-text {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}
.score-percent {
    font-size: 1.8rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.score-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.score-legend {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 4px;
    flex-shrink: 0;
}
.legend-dot.primary {
    background: var(--accent-primary);
}
.legend-dot.secondary {
    background: var(--bg-tertiary);
}

/* Fairness section */
.fairness-section {
    margin-top: 0;
}
.fairness-card {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}
.fairness-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 16px var(--accent-glow);
}
.fairness-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 2;
}

/* ============================================
   TEAM SECTION
   ============================================ */
.team-display {
    text-align: center;
}
.team-number {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--gradient-primary);
    margin-bottom: 24px;
    box-shadow: 0 12px 40px var(--accent-glow);
    animation: teamPulse 4s ease-in-out infinite;
}
@keyframes teamPulse {
    0%, 100% { box-shadow: 0 12px 40px var(--accent-glow); }
    50% { box-shadow: 0 16px 60px var(--accent-glow), 0 0 80px var(--accent-glow); }
}
.team-num-big {
    font-size: 3.5rem;
    font-weight: 900;
    color: #fff;
    line-height: 1;
}
.team-num-label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.8);
    font-weight: 600;
}
.team-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* ============================================
   SCENARIOS SECTION
   ============================================ */
.scenario-card {
    display: flex;
    gap: 28px;
    margin-bottom: 32px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 36px;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.scenario-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition);
}
.scenario-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(-4px);
}
.scenario-card:hover::after {
    opacity: 1;
}

.scenario-num-badge {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px var(--accent-glow);
}
.scenario-num-badge span {
    font-size: 1.5rem;
    font-weight: 900;
    color: #fff;
}

.scenario-content {
    flex: 1;
    min-width: 0;
}

.scenario-titles {
    margin-bottom: 8px;
}
.scenario-titles h3 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 4px;
}
.scenario-en {
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
    font-style: italic;
    direction: ltr;
    display: inline-block;
}

.scenario-eng-name {
    margin-bottom: 16px;
}
.scenario-eng-name span {
    display: inline-block;
    padding: 4px 14px;
    background: var(--accent-glow);
    color: var(--accent-primary);
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: 6px;
}

.scenario-body p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 12px;
}
.scenario-body p:last-child {
    margin-bottom: 0;
}

.scenario-note {
    font-size: 0.88rem !important;
    color: var(--text-muted) !important;
    font-style: italic;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    border-right: 3px solid var(--accent-primary);
}

/* Challenge levels (Scenario 4) */
.challenge-levels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin: 20px 0;
}
.level-card {
    padding: 20px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--card-border);
    background: var(--bg-secondary);
    transition: all var(--transition);
}
.level-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.level-badge {
    display: inline-block;
    padding: 2px 12px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}
.level-1 .level-badge { background: var(--level-1); }
.level-2 .level-badge { background: var(--level-2); }
.level-3 .level-badge { background: var(--level-3); }
.level-label {
    display: block;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 8px;
}
.level-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.85;
    margin-bottom: 0 !important;
}

/* Scoring info inside scenarios */
.scoring-info {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    padding: 20px;
    margin: 16px 0;
    border: 1px solid var(--card-border);
}
.scoring-info h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 10px;
}
.scoring-info p {
    font-size: 0.9rem !important;
}

/* Scenario featured (6) */
.scenario-card--featured {
    border-color: var(--accent-glow);
    box-shadow: 0 0 0 1px var(--accent-glow);
}
.scenario-card--featured::after {
    opacity: 0.5;
}

/* ============================================
   SAFETY SECTION
   ============================================ */
.safety-intro {
    margin-bottom: 32px;
}
.safety-intro p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 2;
}

.safety-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.safety-card {
    padding: 28px;
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    transition: all var(--transition);
}
.safety-card:hover {
    transform: translateY(-3px);
}
.safety-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 4px;
}

.safety-card--critical {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
}
.safety-card--critical::before {
    background: var(--danger);
}
.safety-card--critical .safety-icon {
    color: var(--danger);
}
.safety-card--critical h3 {
    color: var(--danger);
}

.safety-card--warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
}
.safety-card--warning::before {
    background: var(--warning);
}
.safety-card--warning .safety-icon {
    color: var(--warning);
}
.safety-card--warning h3 {
    color: var(--warning);
}

.safety-icon {
    margin-bottom: 16px;
}
.safety-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.safety-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

.safety-note p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 10px;
}
.safety-note p:last-child {
    margin-bottom: 0;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--card-border);
    padding: 48px 0 32px;
}
.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    text-align: center;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-primary);
}
.footer-drone-icon {
    color: var(--accent-primary);
    opacity: 0.7;
}
.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}
.footer-links a {
    font-size: 0.88rem;
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-links a:hover {
    color: var(--accent-primary);
}
.footer-copy p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   ANIMATIONS — Scroll Reveal
   ============================================ */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animations for grids */
.features-grid [data-animate]:nth-child(2) { transition-delay: 0.1s; }
.features-grid [data-animate]:nth-child(3) { transition-delay: 0.2s; }
.hardware-grid [data-animate]:nth-child(2) { transition-delay: 0.12s; }
.hardware-grid [data-animate]:nth-child(3) { transition-delay: 0.24s; }
.constraints-grid [data-animate]:nth-child(2) { transition-delay: 0.05s; }
.constraints-grid [data-animate]:nth-child(3) { transition-delay: 0.1s; }
.constraints-grid [data-animate]:nth-child(4) { transition-delay: 0.15s; }
.constraints-grid [data-animate]:nth-child(5) { transition-delay: 0.2s; }
.constraints-grid [data-animate]:nth-child(6) { transition-delay: 0.25s; }
.constraints-grid [data-animate]:nth-child(7) { transition-delay: 0.3s; }
.constraints-grid [data-animate]:nth-child(8) { transition-delay: 0.35s; }
.constraints-grid [data-animate]:nth-child(9) { transition-delay: 0.4s; }
.constraints-grid [data-animate]:nth-child(10) { transition-delay: 0.45s; }

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        background: var(--nav-bg);
        -webkit-backdrop-filter: blur(20px);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--card-border);
        box-shadow: var(--shadow-md);
    }
    .nav-links.open {
        display: flex;
    }
    .mobile-menu-btn {
        display: flex;
    }

    .scoring-layout {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        flex-wrap: wrap;
        border-radius: var(--border-radius);
        padding: 20px;
        gap: 16px;
    }
    .stat-divider {
        display: none;
    }
    .hero-stat {
        min-width: 70px;
    }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 640px) {
    .section {
        padding: 70px 0;
    }
    .section-header {
        margin-bottom: 40px;
    }

    .hero {
        padding: 100px 16px 50px;
    }
    .hero-drone-anim {
        display: none;
    }

    .glass-card {
        padding: 22px 18px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
    .constraints-grid {
        grid-template-columns: 1fr;
    }
    .hardware-grid {
        grid-template-columns: 1fr;
    }
    .safety-grid {
        grid-template-columns: 1fr;
    }

    .scenario-card {
        flex-direction: column;
        gap: 16px;
        padding: 24px 20px;
    }
    .scenario-num-badge {
        width: 44px;
        height: 44px;
        border-radius: 12px;
    }
    .scenario-num-badge span {
        font-size: 1.2rem;
    }

    .challenge-levels {
        grid-template-columns: 1fr;
    }

    .highlight-content {
        padding: 20px;
    }

    .team-number {
        width: 110px;
        height: 110px;
    }
    .team-num-big {
        font-size: 2.8rem;
    }

    .footer-links {
        gap: 16px;
    }
}

/* ---------- Print ---------- */
@media print {
    .navbar, .scroll-indicator, .theme-toggle, .hero-bg, .hero-drone-anim {
        display: none !important;
    }
    .hero {
        min-height: auto;
        padding: 40px 0;
    }
    [data-animate] {
        opacity: 1 !important;
        transform: none !important;
    }
}