/* ============================================
   OPEN DAY 2026 - CHALLENGE GAME
   Navy Blue Tech-Futuristic Theme
   ============================================ */

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

:root {
    /* Open Day 2026 Color Palette */
    --navy-deep: #050d1f;
    --navy-dark: #0a1a3a;
    --navy-mid: #0f2557;
    --navy-light: #1a3a7a;
    --blue-bright: #2196f3;
    --blue-glow: #4fc3f7;
    --blue-electric: #00b8ff;
    --blue-soft: #64b5f6;
    --white: #ffffff;
    --white-dim: rgba(255, 255, 255, 0.7);
    --white-faint: rgba(255, 255, 255, 0.15);
    --gold: #ffc107;
    --gold-light: #ffd54f;

    /* Gradients */
    --bg-gradient: linear-gradient(160deg, #050d1f 0%, #0a1a3a 30%, #0f2557 60%, #0a1a3a 100%);
    --blue-gradient: linear-gradient(135deg, #2196f3, #00b8ff, #4fc3f7);
    --card-gradient: linear-gradient(145deg, rgba(33, 150, 243, 0.08), rgba(0, 184, 255, 0.03));
    --card-border: linear-gradient(145deg, rgba(33, 150, 243, 0.3), rgba(79, 195, 247, 0.08));

    /* Glass */
    --glass-bg: rgba(10, 26, 58, 0.6);
    --glass-border: rgba(33, 150, 243, 0.2);

    /* Fonts */
    --font-display: 'Chakra Petch', 'Be Vietnam Pro', sans-serif;
    --font-body: 'Be Vietnam Pro', sans-serif;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    background: var(--bg-gradient);
    color: var(--white);
    -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    user-select: none;
    touch-action: none;
}

/* ---- PARTICLE CANVAS ---- */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ---- SPEED LINES OVERLAY ---- */
.speed-lines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.speed-lines::before,
.speed-lines::after {
    content: '';
    position: absolute;
    width: 150%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(33, 150, 243, 0.15), rgba(0, 184, 255, 0.3), transparent);
    animation: speedLine 6s linear infinite;
}

.speed-lines::before {
    top: 30%;
    left: -50%;
    transform: rotate(-8deg);
    animation-delay: 0s;
}

.speed-lines::after {
    top: 65%;
    left: -50%;
    transform: rotate(-5deg);
    animation-delay: 3s;
}

@keyframes speedLine {
    0% { transform: translateX(-20%) rotate(-8deg); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateX(40%) rotate(-8deg); opacity: 0; }
}

/* ---- SCREEN SYSTEM ---- */
.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.6s;
    overflow: hidden;
}

.screen.active {
    opacity: 1;
    visibility: visible;
}

/* ---- LIGHT RAYS ---- */
.light-rays {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.ray {
    position: absolute;
    background: linear-gradient(180deg,
        rgba(33, 150, 243, 0.12) 0%,
        rgba(0, 184, 255, 0.05) 50%,
        transparent 100%);
    transform-origin: top right;
}

.ray-1 {
    width: 300px;
    height: 120%;
    top: -10%;
    right: -80px;
    transform: rotate(-25deg);
    animation: rayPulse 8s ease-in-out infinite alternate;
}

.ray-2 {
    width: 200px;
    height: 100%;
    top: 0;
    right: 40px;
    transform: rotate(-15deg);
    opacity: 0.6;
    animation: rayPulse 10s ease-in-out infinite alternate-reverse;
}

.ray-3 {
    width: 150px;
    height: 80%;
    top: 10%;
    right: -20px;
    transform: rotate(-35deg);
    opacity: 0.4;
    animation: rayPulse 6s ease-in-out infinite alternate;
}

@keyframes rayPulse {
    from { opacity: 0.3; }
    to { opacity: 0.8; }
}

/* Lens Flare */
.lens-flare {
    position: absolute;
    top: 15%;
    right: 10%;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle,
        rgba(79, 195, 247, 0.15) 0%,
        rgba(33, 150, 243, 0.05) 40%,
        transparent 70%);
    filter: blur(20px);
    animation: flarePulse 4s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes flarePulse {
    from { transform: scale(0.8); opacity: 0.5; }
    to { transform: scale(1.3); opacity: 1; }
}

/* ============================================
   SCREEN 1: SWIPE UP
   ============================================ */

/* Logos */
.logos-container {
    position: absolute;
    top: clamp(28px, 5vh, 50px);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 22px;
    background: rgba(10, 26, 58, 0.7);
    border: 1px solid rgba(33, 150, 243, 0.15);
    border-radius: 50px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    animation: fadeInDown 1s ease-out;
}

.logo {
    height: 32px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.1) drop-shadow(0 0 6px rgba(33, 150, 243, 0.3));
}

.logo-divider {
    width: 1px;
    height: 24px;
    background: linear-gradient(180deg, transparent, rgba(33, 150, 243, 0.4), transparent);
}

/* Event Tag */
.event-tag {
    position: absolute;
    top: clamp(90px, 14vh, 130px);
    display: flex;
    align-items: baseline;
    gap: 8px;
    animation: fadeInDown 1s ease-out 0.2s both;
}

.tag-label {
    font-family: var(--font-display);
    font-size: clamp(13px, 3.5vw, 16px);
    font-weight: 600;
    letter-spacing: 5px;
    color: var(--blue-glow);
    text-shadow: 0 0 20px rgba(79, 195, 247, 0.5);
}

.tag-year {
    font-family: var(--font-display);
    font-size: clamp(22px, 6vw, 32px);
    font-weight: 700;
    background: var(--blue-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 12px rgba(33, 150, 243, 0.4));
}

/* Swipe Content */
.swipe-content {
    text-align: center;
    padding: 0 24px;
    z-index: 2;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.challenge-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-family: var(--font-display);
    font-size: 11px;
    letter-spacing: 6px;
    color: var(--blue-glow);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.label-line {
    display: inline-block;
    width: 30px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--blue-glow));
}

.label-line:last-child {
    background: linear-gradient(90deg, var(--blue-glow), transparent);
}

.main-title {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 18px;
}

.title-line {
    font-family: var(--font-display);
    font-size: clamp(22px, 6vw, 34px);
    font-weight: 700;
    letter-spacing: 2px;
    line-height: 1.3;
    color: var(--white);
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.title-line.highlight {
    background: linear-gradient(135deg, #ffffff, #4fc3f7, #2196f3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 15px rgba(33, 150, 243, 0.4));
}

.subtitle {
    font-size: 14px;
    font-style: italic;
    color: var(--white-dim);
    font-weight: 400;
    letter-spacing: 1px;
}

/* Swipe Indicator */
.swipe-indicator {
    position: absolute;
    bottom: clamp(35px, 7vh, 70px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    animation: fadeInUp 1s ease-out 0.7s both;
}

.swipe-arrow-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.swipe-arrow {
    width: 18px;
    height: 18px;
    border-left: 2px solid var(--blue-bright);
    border-top: 2px solid var(--blue-bright);
    transform: rotate(45deg);
    opacity: 0;
    animation: arrowPulse 2s ease-in-out infinite;
}

.swipe-arrow:nth-child(1) { animation-delay: 0s; }
.swipe-arrow:nth-child(2) { animation-delay: 0.2s; }
.swipe-arrow:nth-child(3) { animation-delay: 0.4s; }

@keyframes arrowPulse {
    0% { opacity: 0; transform: rotate(45deg) translateY(8px); }
    50% { opacity: 1; transform: rotate(45deg) translateY(0); }
    100% { opacity: 0; transform: rotate(45deg) translateY(-8px); }
}

.swipe-line {
    width: 2px;
    height: 36px;
    background: linear-gradient(to top, transparent, var(--blue-bright));
    border-radius: 2px;
}

.swipe-text {
    font-family: var(--font-display);
    font-size: 10px;
    letter-spacing: 5px;
    color: var(--blue-glow);
    animation: textGlow 2s ease-in-out infinite alternate;
}

@keyframes textGlow {
    from { opacity: 0.5; text-shadow: none; }
    to { opacity: 1; text-shadow: 0 0 15px rgba(79, 195, 247, 0.5); }
}

/* Pulse Ring */
.pulse-ring {
    position: absolute;
    width: 180px;
    height: 180px;
    border: 1px solid rgba(33, 150, 243, 0.12);
    border-radius: 50%;
    animation: pulseRing 3s ease-out infinite;
}

@keyframes pulseRing {
    0% { transform: scale(0.8); opacity: 0.4; }
    100% { transform: scale(2.5); opacity: 0; }
}

/* ============================================
   SCREEN 2: LOADING - Compass Style
   ============================================ */

#loadingScreen {
    background: var(--bg-gradient);
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

/* Compass Loader */
.compass-loader {
    position: relative;
    width: 80px;
    height: 80px;
}

.compass-ring {
    width: 80px;
    height: 80px;
    border: 2px solid rgba(33, 150, 243, 0.15);
    border-top: 2px solid var(--blue-bright);
    border-right: 2px solid var(--blue-glow);
    border-radius: 50%;
    animation: compassSpin 1.5s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.compass-needle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 32px;
    background: linear-gradient(180deg, var(--blue-bright), transparent);
    transform-origin: bottom center;
    transform: translate(-50%, -100%);
    animation: needleSway 1.5s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.compass-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    background: var(--blue-glow);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 12px rgba(79, 195, 247, 0.6);
}

@keyframes compassSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes needleSway {
    0%, 100% { transform: translate(-50%, -100%) rotate(-30deg); }
    50% { transform: translate(-50%, -100%) rotate(30deg); }
}

.loading-text {
    font-family: var(--font-display);
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--blue-glow);
}

.dots::after {
    content: '';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0% { content: ''; }
    25% { content: '.'; }
    50% { content: '..'; }
    75% { content: '...'; }
}

.loading-bar {
    width: 180px;
    height: 3px;
    background: rgba(33, 150, 243, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.loading-bar-fill {
    width: 0%;
    height: 100%;
    background: var(--blue-gradient);
    border-radius: 3px;
    box-shadow: 0 0 10px rgba(33, 150, 243, 0.4);
    transition: width 0.1s linear;
}

/* ============================================
   SCREEN 3: QUESTION
   ============================================ */

#questionScreen {
    overflow-y: auto;
    justify-content: flex-start;
    padding-top: clamp(16px, 3vh, 30px);
}

.light-rays-q {
    opacity: 0.5;
}

/* Question Screen Logos */
.question-logos {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    animation: fadeInDown 0.8s ease-out;
    z-index: 2;
}

.logo-sm {
    height: 26px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.1) drop-shadow(0 0 4px rgba(33, 150, 243, 0.2));
    opacity: 0.8;
}

.question-container {
    width: 100%;
    max-width: 420px;
    padding: 0 20px 40px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    z-index: 2;
    animation: fadeInUp 0.8s ease-out;
}

.question-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.topic-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.topic-icon {
    font-size: 16px;
    color: var(--blue-glow);
}

.topic-label {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
    color: var(--white-dim);
}

.topic-name {
    font-family: var(--font-display);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--blue-glow);
    text-transform: uppercase;
}

.question-number {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, rgba(33,150,243,0.3), rgba(79,195,247,0.15));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Question Card */
.question-card {
    position: relative;
    padding: 36px 26px;
    background: linear-gradient(145deg,
        rgba(15, 37, 87, 0.7),
        rgba(10, 26, 58, 0.9));
    border: 1px solid rgba(33, 150, 243, 0.25);
    border-radius: 20px;
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    overflow: hidden;
    animation: cardAppear 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
    box-shadow:
        0 0 20px rgba(33, 150, 243, 0.08),
        0 0 60px rgba(33, 150, 243, 0.04),
        inset 0 1px 0 rgba(79, 195, 247, 0.1);
}

.question-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(79, 195, 247, 0.4), transparent);
}

/* Removed rotating border glow — replaced with clean static glow */
.card-border-glow {
    display: none;
}

.question-mark {
    position: absolute;
    top: -10px;
    right: 14px;
    font-family: var(--font-display);
    font-size: 110px;
    font-weight: 700;
    background: linear-gradient(180deg, rgba(33, 150, 243, 0.1) 0%, transparent 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    pointer-events: none;
    line-height: 1;
}

.question-text {
    font-family: var(--font-body);
    font-size: clamp(18px, 5vw, 24px);
    font-weight: 500;
    line-height: 1.7;
    color: var(--white);
    position: relative;
    z-index: 1;
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: translateY(25px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Note Card */
.note-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 20px;
    background: linear-gradient(145deg,
        rgba(255, 193, 7, 0.08),
        rgba(255, 193, 7, 0.02));
    border: 1px solid rgba(255, 193, 7, 0.15);
    border-radius: 16px;
    animation: cardAppear 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s both;
}

.note-icon {
    font-size: 22px;
    color: var(--gold-light);
    flex-shrink: 0;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.note-text {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 400;
}

.note-text strong {
    color: var(--gold-light);
    font-weight: 600;
}

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

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* ---- SWIPE DRAG FEEDBACK ---- */
#swipeScreen.dragging .swipe-content {
    transition: transform 0.05s linear;
}

#swipeScreen.dragging .swipe-indicator {
    transition: opacity 0.2s ease;
}

/* ---- SCREEN TRANSITIONS ---- */
.screen.slide-out-up {
    animation: slideOutUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideOutUp {
    to { opacity: 0; transform: translateY(-100%); }
}

.screen.slide-in-up {
    animation: slideInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideInUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); visibility: visible; }
}

/* Haptic flash */
.haptic-flash {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(33, 150, 243, 0.2), transparent 70%);
    z-index: 100;
    pointer-events: none;
    animation: flashPulse 0.4s ease-out forwards;
}

@keyframes flashPulse {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

/* ============================================
   DESKTOP BLOCKER
   ============================================ */
.desktop-blocker {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    background: var(--bg-gradient);
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.blocker-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
    padding: 40px;
    animation: fadeInUp 0.8s ease-out;
}

.blocker-icon {
    font-size: 48px;
    color: var(--blue-glow);
    animation: pulse 2s ease-in-out infinite;
}

.blocker-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.4;
}

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

.blocker-text {
    font-size: 15px;
    color: var(--white-dim);
    line-height: 1.7;
    max-width: 380px;
}

/* Phone illustration */
.blocker-phone {
    margin-top: 10px;
}

.phone-frame {
    width: 70px;
    height: 130px;
    border: 3px solid rgba(33, 150, 243, 0.4);
    border-radius: 16px;
    padding: 8px 4px;
    position: relative;
    animation: phoneBounce 3s ease-in-out infinite;
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: rgba(33, 150, 243, 0.3);
    border-radius: 3px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    border-radius: 8px;
    background: linear-gradient(180deg,
        rgba(33, 150, 243, 0.1) 0%,
        rgba(0, 184, 255, 0.05) 100%);
}

@keyframes phoneBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ---- RESPONSIVE ---- */
@media (min-width: 768px) {
    .desktop-blocker {
        display: flex;
    }

    .screen,
    #particleCanvas,
    .speed-lines {
        display: none !important;
    }
}

@media (max-height: 600px) {
    .logos-container {
        top: 12px;
    }

    .event-tag {
        top: 60px;
    }

    .swipe-indicator {
        bottom: 20px;
    }

    .challenge-label {
        margin-bottom: 12px;
    }
}