/* ============================================
   TerraHold — Global Styles
   ============================================ */

:root {
    --primary: #4fc3f7;
    --primary-glow: rgba(79, 195, 247, 0.3);
    --accent: #00e676;
    --accent-glow: rgba(0, 230, 118, 0.3);
    --bg-dark: #0a0e17;
    --bg-glass: rgba(10, 14, 23, 0.65);
    --bg-glass-light: rgba(255, 255, 255, 0.06);
    --border-glass: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --danger: #ef5350;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-dark);
    font-family: var(--font-main);
    color: var(--text-primary);
}

.hidden {
    display: none !important;
}

/* ============================================
   Canvas & Video
   ============================================ */

#render-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* ============================================
   Loading Screen
   ============================================ */

#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

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

.earth-loader {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 32px;
}

.loader-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 2px solid transparent;
    border-radius: 50%;
}

.loader-ring:nth-child(1) {
    border-top-color: var(--primary);
    animation: spin 1.5s linear infinite;
}

.loader-ring:nth-child(2) {
    border-right-color: var(--accent);
    animation: spin 2s linear infinite reverse;
    top: 10px;
    left: 10px;
    width: calc(100% - 20px);
    height: calc(100% - 20px);
}

.loader-ring:nth-child(3) {
    border-bottom-color: var(--primary);
    animation: spin 2.5s linear infinite;
    top: 20px;
    left: 20px;
    width: calc(100% - 40px);
    height: calc(100% - 40px);
}

.loader-globe {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 40px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        transform: translate(-50%, -50%) scale(1.15);
    }
}

.loader-title {
    font-family: var(--font-display);
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 2px;
}

.loader-author {
    color: var(--accent);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 24px;
    opacity: 0.8;
}

.title-terra {
    color: var(--primary);
    text-shadow: 0 0 30px var(--primary-glow);
}

.title-hold {
    color: var(--text-primary);
}

.loader-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 32px;
}

.loader-progress {
    width: 200px;
    height: 3px;
    background: var(--bg-glass-light);
    border-radius: 4px;
    margin: 0 auto;
    overflow: hidden;
}

.loader-progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    transition: width 0.3s ease;
}

.loader-status {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 16px;
    letter-spacing: 0.5px;
    min-height: 18px;
}

/* ============================================
   Camera Error
   ============================================ */

#camera-error {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}

.error-content {
    text-align: center;
    max-width: 400px;
    padding: 40px;
}

.error-icon {
    font-size: 64px;
    margin-bottom: 24px;
    filter: grayscale(0.5);
}

.error-content h2 {
    font-family: var(--font-display);
    font-size: 28px;
    margin-bottom: 12px;
}

.error-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 28px;
}

.retry-btn {
    background: linear-gradient(135deg, var(--primary), #29b6f6);
    color: white;
    border: none;
    padding: 14px 36px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
}

/* ============================================
   Instructions Overlay
   ============================================ */

#instructions {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.instructions-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 32px;
    max-width: 380px;
    width: 90%;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.instructions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.instructions-header h2 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
}

.close-btn {
    background: var(--bg-glass-light);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

.instruction-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-glass);
}

.instruction-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.instruction-icon {
    font-size: 28px;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass-light);
    border-radius: 12px;
}

.instruction-item strong {
    font-size: 15px;
    display: block;
    margin-bottom: 4px;
}

.instruction-item p {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.4;
}

/* ============================================
   HUD (Heads-Up Display)
   ============================================ */

#hud {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

.hud-top-left {
    position: absolute;
    top: 20px;
    left: 24px;
}

.hud-logo {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.hud-author {
    font-family: var(--font-main);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-top: 2px;
    opacity: 0.8;
}

.hud-top-right {
    position: absolute;
    top: 20px;
    right: 24px;
    display: flex;
    gap: 8px;
}

.hud-badge {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-main);
    letter-spacing: 0.5px;
}

.hud-btn {
    pointer-events: all;
    cursor: pointer;
    transition: background 0.2s;
    font-weight: 700;
    font-size: 14px;
    width: 36px;
    padding: 8px 0;
    text-align: center;
}

.hud-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* ============================================
   Settings Panel
   ============================================ */

.params-panel {
    position: absolute;
    top: 60px;
    right: 24px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 20px;
    border-radius: 16px;
    width: 280px;
    color: var(--text-primary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    pointer-events: all;
    /* Enable interaction */
    transform-origin: top right;
    animation: scaleIn 0.2s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.params-panel h3 {
    font-family: var(--font-display);
    font-size: 16px;
    margin-bottom: 16px;
    font-weight: 600;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 8px;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.setting-row label {
    font-size: 14px;
    color: var(--text-secondary);
}

.setting-row input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

#close-params {
    width: 100%;
    margin-top: 16px;
    padding: 10px;
    background: var(--bg-glass-light);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background 0.2s;
}

#close-params:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hud-bottom {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
}

.hand-status-bar {
    display: flex;
    gap: 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 10px 20px;
    border-radius: 14px;
}

.hand-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.hand-indicator .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #555;
    transition: background 0.3s, box-shadow 0.3s;
}

.hand-indicator.on {
    color: var(--accent);
}

.hand-indicator.on .dot {
    background: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
    animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.4);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(0, 230, 118, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(0, 230, 118, 0);
    }
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
    .loader-title {
        font-size: 32px;
    }

    .instructions-card {
        padding: 24px;
    }
}