/* ==========================================================================
   Deep Trance Soundscape - CSS stylesheet
   ========================================================================== */

:root {
    --bg-dark: #060713;
    --panel-bg: rgba(11, 12, 30, 0.55);
    --panel-border: rgba(255, 255, 255, 0.06);
    --panel-border-glowing: rgba(139, 92, 246, 0.25);
    
    /* Harmonious Color System */
    --color-cyan: #00f2fe;
    --color-cyan-rgb: 0, 242, 254;
    --color-violet: #8b5cf6;
    --color-violet-rgb: 139, 92, 246;
    --color-indigo: #4f46e5;
    --color-rose: #f43f5e;
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --font-primary: 'Outfit', 'Noto Sans SC', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    
    /* Interactive variables updated dynamically via JS */
    --breath-scale: 1.0;
    --breath-opacity: 0.6;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-primary);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

/* ==========================================================================
   Background Animated Starfield & Glows
   ========================================================================== */
.bg-glow-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    mix-blend-mode: screen;
}

.orb-1 {
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--color-indigo) 0%, transparent 70%);
    top: -10vw;
    left: -10vw;
    animation: floatOrb 30s infinite alternate;
}

.orb-2 {
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--color-violet) 0%, transparent 70%);
    bottom: -15vw;
    right: -10vw;
    animation: floatOrb 45s infinite alternate-reverse;
}

.orb-3 {
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--color-cyan) 0%, transparent 70%);
    top: 30vh;
    left: 50vw;
    transform: translate(-50%, -50%);
    opacity: 0.1;
    animation: pulseOrb 20s infinite alternate;
}

.stars-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(1px 1px at 20px 30px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 150px 50px, rgba(255,255,255,0.7), rgba(0,0,0,0)),
        radial-gradient(2px 2px at 80px 220px, rgba(255,255,255,0.8), rgba(0,0,0,0)),
        radial-gradient(1px 1px at 300px 180px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 240px 320px, rgba(255,255,255,0.6), rgba(0,0,0,0));
    background-repeat: repeat;
    background-size: 400px 400px;
    opacity: 0.35;
    animation: slowScroll 180s linear infinite;
}

@keyframes floatOrb {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(5vw) scale(1.1); }
}

@keyframes pulseOrb {
    0% { opacity: 0.08; transform: translate(-50%, -50%) scale(0.9); }
    100% { opacity: 0.14; transform: translate(-50%, -50%) scale(1.1); }
}

@keyframes slowScroll {
    from { background-position: 0 0; }
    to { background-position: 0 400px; }
}

/* ==========================================================================
   Layout Containers & App Wrapper
   ========================================================================== */
.app-container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 1;
}

/* Floating Back Button */
.back-home-btn {
    position: fixed;
    top: 24px;
    left: 24px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(15, 17, 39, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 100;
    backdrop-filter: blur(15px);
    transition: var(--transition-smooth);
}

.back-home-btn:hover {
    color: var(--color-cyan);
    background: rgba(15, 17, 39, 0.7);
    border-color: rgba(0, 242, 254, 0.25);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
    transform: translateX(-2px);
}

.home-icon-svg {
    width: 22px;
    height: 22px;
}

/* Header */
.app-header {
    text-align: center;
    padding: 10px 0;
}

.header-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-cyan);
    background: rgba(0, 242, 254, 0.08);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid rgba(0, 242, 254, 0.15);
    margin-bottom: 12px;
}

.header-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 6px;
}

.header-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.welcome-banner {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--color-violet);
    font-weight: 500;
    letter-spacing: 0.5px;
    background: rgba(139, 92, 246, 0.05);
    padding: 4px 16px;
    border-radius: 8px;
    display: inline-block;
    border: 1px solid rgba(139, 92, 246, 0.08);
    animation: fadeIn 0.8s ease forwards;
}

.hidden {
    display: none !important;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Workspace Cards (Glassmorphism Panels)
   ========================================================================== */
.player-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 20px;
}

.glass-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 24px;
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: border-color 0.4s ease;
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.1);
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 14px;
}

.panel-icon {
    width: 20px;
    height: 20px;
    color: var(--color-cyan);
}

.panel-title {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* ==========================================================================
   Mixer Sliders & Controls
   ========================================================================== */
.mixer-sliders {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mixer-control-group {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 16px;
    transition: var(--transition-smooth);
}

.mixer-control-group:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.06);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.slider-label-block {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.slider-name {
    font-size: 0.95rem;
    font-weight: 500;
}

.slider-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.slider-val {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-cyan);
    background: rgba(0, 242, 254, 0.08);
    padding: 2px 8px;
    border-radius: 6px;
    border: 1px solid rgba(0, 242, 254, 0.12);
}

/* Custom Range Input */
.hud-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    outline: none;
    transition: background 0.3s;
}

.hud-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
}

.hud-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-cyan);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.7);
    margin-top: -6px;
    transition: var(--transition-smooth);
}

.hud-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(0, 242, 254, 1);
}

.mixer-actions {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
}

.btn-secondary {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-secondary:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   Visualizer & Breathing Guide
   ========================================================================== */
.panel-visuals {
    display: flex;
    flex-direction: column;
}

.visuals-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-grow: 1;
}

/* Canvas Visualizer container */
.visualizer-container {
    height: 120px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

#visualizer-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Breathing Mandala circles container */
.breathing-mandala-container {
    flex-grow: 1;
    min-height: 250px;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.03) 0%, transparent 70%);
    border: 1px solid rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.mandala-glow {
    position: absolute;
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, rgba(139, 92, 246, 0.08) 50%, transparent 100%);
    filter: blur(10px);
    transform: scale(var(--breath-scale));
    opacity: var(--breath-opacity);
    pointer-events: none;
    transition: transform 0.1s linear, opacity 0.1s linear;
}

.mandala-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px dashed rgba(0, 242, 254, 0.15);
    pointer-events: none;
    transform: scale(var(--breath-scale));
    transition: transform 0.1s linear;
}

.mandala-ring.outer {
    width: 180px;
    height: 180px;
    border: 1px dashed rgba(139, 92, 246, 0.15);
    animation: rotateRing 30s linear infinite;
}

.mandala-ring.inner {
    width: 140px;
    height: 140px;
    border: 1.5px solid rgba(0, 242, 254, 0.06);
    border-style: double;
    animation: rotateRingRev 20s linear infinite;
}

.mandala-core {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.6) 0%, rgba(0, 242, 254, 0.25) 100%);
    box-shadow: 0 0 25px rgba(139, 92, 246, 0.5), inset 0 0 10px rgba(255, 255, 255, 0.4);
    pointer-events: none;
    transform: scale(var(--breath-scale));
    transition: transform 0.1s linear;
    z-index: 2;
}

.breathing-prompt {
    position: absolute;
    bottom: 24px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-cyan);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
    letter-spacing: 1px;
    z-index: 3;
    transition: opacity 0.5s ease;
}

@keyframes rotateRing {
    from { transform: scale(var(--breath-scale)) rotate(0deg); }
    to { transform: scale(var(--breath-scale)) rotate(360deg); }
}

@keyframes rotateRingRev {
    from { transform: scale(var(--breath-scale)) rotate(360deg); }
    to { transform: scale(var(--breath-scale)) rotate(0deg); }
}

/* ==========================================================================
   Bottom Session HUD control panel
   ========================================================================== */
.session-hud-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    margin-top: 10px;
}

.hud-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.timer-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hud-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hud-select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    font-family: var(--font-primary);
    font-size: 0.85rem;
    padding: 6px 12px;
    border-radius: 8px;
    outline: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.hud-select:hover {
    border-color: rgba(255, 255, 255, 0.25);
    background: rgba(255, 255, 255, 0.08);
}

.hud-select option {
    background: #0f1025;
    color: #fff;
}

.timer-countdown {
    font-family: var(--font-primary);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-cyan);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
    min-width: 80px;
}

/* Play/Start Session button styling */
.btn-session-play {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--color-indigo) 0%, var(--color-violet) 50%, var(--color-cyan) 100%);
    border: none;
    border-radius: 12px;
    color: #fff;
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.5px;
    padding: 12px 28px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
    transition: var(--transition-smooth);
    min-width: 250px;
}

.btn-session-play:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 242, 254, 0.4);
}

.btn-session-play:active {
    transform: translateY(0);
}

/* Glowing active border when session is running */
.session-active-border {
    border-color: var(--panel-border-glowing) !important;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.15), 0 10px 30px rgba(0, 0, 0, 0.35) !important;
}

.play-icon, .pause-icon {
    display: flex;
    align-items: center;
}

.play-icon svg, .pause-icon svg {
    width: 18px;
    height: 18px;
}

.hud-right {
    display: flex;
    align-items: center;
}

.headphone-tip {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: help;
}

.tip-icon {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
}

.headphone-tip:hover {
    color: var(--color-cyan);
    border-color: rgba(0, 242, 254, 0.15);
    background: rgba(0, 242, 254, 0.03);
}

.headphone-tip:hover .tip-icon {
    color: var(--color-cyan);
}

/* ==========================================================================
   Responsive Viewports
   ========================================================================== */
@media (max-width: 900px) {
    body {
        padding: 16px;
    }
    
    .player-grid {
        grid-template-columns: 1fr;
    }
    
    .session-hud-bar {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
        padding: 20px;
    }
    
    .hud-left {
        justify-content: space-between;
    }
    
    .hud-center {
        display: flex;
        justify-content: center;
    }
    
    .btn-session-play {
        width: 100%;
    }
    
    .hud-right {
        justify-content: center;
    }
}

@media (max-width: 500px) {
    .header-title {
        font-size: 1.8rem;
    }
    
    .back-home-btn {
        top: 12px;
        left: 12px;
        width: 40px;
        height: 40px;
        border-radius: 8px;
    }
    
    .home-icon-svg {
        width: 18px;
        height: 18px;
    }
    
    body {
        padding-top: 60px;
    }
}