/* ===== CSS Variables & Theme ===== */
:root {
    --bg-dark: #0a0a0f;
    --bg-darker: #050508;
    --accent-cyan: #00f5ff;
    --accent-pink: #ff00ff;
    --accent-gold: #ffd700;
    --accent-teal: #00e5cc;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.6);
    --glass-bg: rgba(10, 10, 20, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glow-cyan: 0 0 20px rgba(0, 245, 255, 0.5), 0 0 40px rgba(0, 245, 255, 0.3);
    --glow-pink: 0 0 20px rgba(255, 0, 255, 0.5), 0 0 40px rgba(255, 0, 255, 0.3);
}

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

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

.hidden {
    display: none !important;
}

/* ===== Intro Screen ===== */
#intro-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    z-index: 1000;
    overflow: hidden;
}

.intro-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 3rem;
}

.logo-container {
    position: relative;
    margin-bottom: 2rem;
}

.logo-text {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(4rem, 15vw, 8rem);
    font-weight: 900;
    letter-spacing: 0.3em;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink), var(--accent-gold));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease infinite;
}

.logo-i {
    font-size: 0.935em;
    vertical-align: baseline;
    background: inherit;
    background-size: inherit;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 0 30px rgba(0, 245, 255, 0.4));
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.tagline {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    letter-spacing: 0.5em;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-top: 0.5rem;
}

.description {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 3rem;
    line-height: 1.6;
}

.glow-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1.2rem 3rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--bg-dark);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-teal));
    border: none;
    border-radius: 60px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--glow-cyan);
}

.glow-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-gold));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.glow-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(0, 245, 255, 0.6), 0 0 80px rgba(0, 245, 255, 0.4);
}

.glow-button:hover::before {
    opacity: 1;
}

.glow-button .btn-icon,
.glow-button .btn-text {
    position: relative;
    z-index: 1;
}

.btn-icon {
    font-size: 1.5rem;
}

.permission-note {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.6;
}

.layout-indicator {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    opacity: 0.5;
    font-family: 'Rajdhani', monospace;
}

/* Intro Background Particles */
.intro-bg-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

/* ===== Main App ===== */
#app {
    position: fixed;
    inset: 0;
    background: var(--bg-darker);
}

#particle-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

/* ===== Camera Preview ===== */
#camera-preview-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 256px;
    height: 144px;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 245, 255, 0.2);
    z-index: 100;
    background: var(--bg-dark);
}

#camera-feed {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
}

#overlay-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.preview-label {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 3px 8px;
    font-size: 0.7rem;
    font-weight: 700;
    background: #ff0040;
    color: white;
    border-radius: 4px;
    animation: livePulse 1.5s ease-in-out infinite;
}

@keyframes livePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ===== Status Indicator ===== */
#status-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    backdrop-filter: blur(10px);
    z-index: 100;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-gold);
    animation: statusPulse 1s ease-in-out infinite;
}

.status-dot.active {
    background: var(--accent-cyan);
}

.status-dot.detecting {
    background: #00ff88;
}

.status-dot.warning {
    background: #ff8800;
}

@keyframes statusPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.status-text {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* ===== Mode Controls ===== */
#mode-controls {
    position: fixed;
    top: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.mode-btn.active {
    color: var(--bg-dark);
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
}

.mode-btn.active[data-mode="repel"] {
    background: var(--accent-pink);
    border-color: var(--accent-pink);
    box-shadow: var(--glow-pink);
}

.mode-btn.active[data-mode="rain"] {
    background: #4a9eff;
    border-color: #4a9eff;
    box-shadow: 0 0 20px rgba(74, 158, 255, 0.5), 0 0 40px rgba(74, 158, 255, 0.3);
}

.mode-btn.active[data-mode="snow"] {
    background: #e8e8e8;
    border-color: #ffffff;
    color: #1a1a2e;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5), 0 0 40px rgba(255, 255, 255, 0.3);
}

.mode-btn.active[data-mode="party"] {
    background: linear-gradient(135deg, #ff0080, #ff8c00, #ffff00, #00ff00, #00bfff, #8b00ff);
    background-size: 400% 400%;
    animation: partyGradient 2s ease infinite;
    border-color: #ff0080;
    color: #1a1a2e;
    box-shadow: 0 0 20px rgba(255, 0, 128, 0.5), 0 0 40px rgba(255, 140, 0, 0.3);
}

@keyframes partyGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.mode-btn.active[data-mode="galactic"] {
    background: linear-gradient(135deg, #1a0033, #4d0099, #9933ff);
    border-color: #9933ff;
    box-shadow: 0 0 20px rgba(153, 51, 255, 0.5), 0 0 40px rgba(77, 0, 153, 0.3);
}

.mode-btn.active[data-mode="matrix"] {
    background: #003300;
    border-color: #00ff00;
    color: #00ff00;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.5), 0 0 40px rgba(0, 255, 0, 0.3);
    text-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
}

.mode-icon {
    font-size: 1.2rem;
}

.theme-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    margin-top: 10px;
}

.theme-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#theme-select {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 6px 10px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

#theme-select:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-pink);
}

#theme-select:focus {
    border-color: var(--accent-pink);
    box-shadow: 0 0 0 2px rgba(255, 0, 255, 0.2);
}

#theme-select option {
    background: var(--bg-dark);
    color: var(--text-primary);
    padding: 8px;
}

/* ===== Fist Action Selector ===== */
.fist-action-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    margin-top: 10px;
}

.fist-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#fist-action {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 6px 10px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

#fist-action:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-cyan);
}

#fist-action:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 2px rgba(0, 245, 255, 0.2);
}

#fist-action option {
    background: var(--bg-dark);
    color: var(--text-primary);
    padding: 8px;
}

/* ===== Shortcuts Panel ===== */
#shortcuts-panel {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    z-index: 100;
}


.shortcut-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

kbd {
    display: inline-block;
    padding: 4px 10px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-cyan);
    background: rgba(0, 245, 255, 0.1);
    border: 1px solid rgba(0, 245, 255, 0.3);
    border-radius: 6px;
    min-width: 50px;
    text-align: center;
}

.gesture-hint {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.75rem;
    background: rgba(255, 0, 255, 0.1);
    border: 1px solid rgba(255, 0, 255, 0.3);
    border-radius: 6px;
    min-width: 50px;
    text-align: center;
}

/* ===== Particle Count ===== */
#particle-count {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 10px 16px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    backdrop-filter: blur(10px);
    z-index: 100;
}

#active-particles {
    color: var(--accent-cyan);
    font-weight: 700;
}

/* ===== Reset Link ===== */
.settings-link {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    color: var(--text-secondary);
    opacity: 0.6;
    text-decoration: none;
    transition: opacity 0.2s ease;
    z-index: 100;
}

.settings-link:hover {
    opacity: 1;
    color: var(--accent-cyan);
}

/* ===== Settings Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(20px);
    min-width: 300px;
    max-width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--accent-pink);
}

.modal-body {
    padding: 20px;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-label {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.setting-row select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--glass-border);
    text-align: center;
}

.reset-link {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.6;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.reset-link:hover {
    opacity: 1;
    color: var(--accent-pink);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .logo-text {
        font-size: 3rem;
        letter-spacing: 0.2em;
    }

    .description {
        font-size: 1rem;
        padding: 0 1rem;
    }

    .glow-button {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    #camera-preview-container {
        width: 180px;
        height: 101px;
    }

    #shortcuts-panel {
        display: none;
    }

    .mode-label {
        display: none;
    }

    .mode-btn {
        padding: 12px 16px;
    }
}

/* ===== Loading Animation ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(5, 5, 8, 0.95);
    z-index: 500;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: 1.5rem;
    font-size: 1rem;
    color: var(--text-secondary);
}