:root {
    /* Precise Spatial Palette */
    --bg-main: #02040a;
    --glass-base: rgba(255, 255, 255, 0.035);
    --glass-edge: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.15);
    
    --accent-primary: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.4);
    
    --text-pure: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* Structural System */
    --p-page: 1.5rem;
    --gap-section: 3rem;
    --radius-player: 32px;
    --radius-card: 24px;
    --spring: cubic-bezier(0.3, 1.5, 0.5, 1);
}

[data-theme="light"] {
    --bg-main: #f8fafc;
    --glass-base: rgba(255, 255, 255, 0.7);
    --glass-edge: rgba(0, 0, 0, 0.05);
    --glass-highlight: rgba(255, 255, 255, 0.8);
    --text-pure: #0f172a;
    --text-muted: #64748b;
    --accent-primary: #0284c7;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Outfit', 'Inter', system-ui, sans-serif;
    background: var(--bg-main);
    color: var(--text-pure);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    overflow-x: hidden;
}

#app {
    width: 100%;
    max-width: 440px;
    padding: 0 var(--p-page);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: var(--gap-section);
}

/* --- UI Primitives --- */
.glass-panel {
    background: var(--glass-base);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-edge);
}

/* --- Top Bar & Nav Buttons --- */
.top-bar {
    position: absolute;
    top: 0; left: 0; right: 0;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 50;
}

.nav-btn, .theme-toggle {
    width: 44px;
    height: 44px;
    background: var(--glass-base);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-edge);
    border-radius: 14px;
    color: var(--text-pure);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-btn:active, .theme-toggle:active { transform: scale(0.92); }
.nav-btn svg, .theme-toggle svg { width: 22px; height: 22px; stroke: currentColor; }

/* --- Main Menu Modal (Centered) --- */
.side-menu {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--p-page);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.menu-content {
    background: var(--bg-main);
    border: 1px solid var(--glass-edge);
    border-radius: var(--radius-card);
    width: 100%;
    max-width: 440px;
    max-height: 80vh;
    padding: 1.5rem; /* Reduced to allow inner control */
    position: relative;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.4s var(--spring);
    z-index: 1;
    overflow: hidden; 
}

.menu-inner {
    overflow-y: auto;
    flex: 1;
    padding-right: 0.5rem; /* Space for scrollbar */
    margin-right: -0.5rem; /* Offset to keep alignment but move scrollbar track */
}

/* Custom Scrollbar for Luxury Minimal feel */
.menu-inner::-webkit-scrollbar,
.modal-inner::-webkit-scrollbar,
.tracks-list::-webkit-scrollbar {
    width: 5px;
}

.menu-inner::-webkit-scrollbar-track,
.modal-inner::-webkit-scrollbar-track,
.tracks-list::-webkit-scrollbar-track {
    background: transparent;
}

.menu-inner::-webkit-scrollbar-thumb,
.modal-inner::-webkit-scrollbar-thumb,
.tracks-list::-webkit-scrollbar-thumb {
    background: var(--glass-edge);
    border-radius: 10px;
}

.side-menu:not(.hidden) .menu-content { transform: translateY(0) scale(1); }


.menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.menu-header h2 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.close-icon {
    background: none;
    border: none;
    color: var(--text-pure);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
}

.menu-section {
    margin-bottom: 2.5rem;
}

.menu-section h3 {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.menu-list {
    list-style: none;
}

.menu-list li {
    padding: 1rem;
    border-radius: 16px;
    margin-bottom: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.02);
}

.menu-list li:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent-primary);
}

/* --- Settings Styling --- */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 16px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.glass-select {
    display: none !important;
}

/* --- Premium Custom Select Dropdowns --- */
.custom-select {
    position: relative;
    user-select: none;
    font-family: inherit;
    min-width: 140px;
}

.custom-select-trigger {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-base);
    border: 1px solid var(--glass-edge);
    color: var(--text-pure);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s var(--spring);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.custom-select-trigger:hover {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .custom-select-trigger:hover {
    background: rgba(0, 0, 0, 0.04);
}

.custom-select-trigger .chevron {
    width: 14px;
    height: 14px;
    transition: transform 0.4s var(--spring);
    opacity: 0.6;
    stroke: currentColor;
    fill: none;
    stroke-width: 2.5;
    margin-left: 0.75rem;
}

.custom-select.open .custom-select-trigger .chevron {
    transform: rotate(180deg);
    color: var(--accent-primary);
    opacity: 1;
}

.custom-select-options {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--bg-main);
    border: 1px solid var(--glass-edge);
    border-radius: 16px;
    z-index: 1000;
    overflow-y: auto;
    max-height: 220px;
    padding: 0.4rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.97);
    transition: transform 0.3s var(--spring), opacity 0.3s ease, visibility 0.3s ease;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.custom-select.open .custom-select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.custom-select-option {
    padding: 0.6rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.custom-select-option:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-pure);
}

[data-theme="light"] .custom-select-option:hover {
    background: rgba(0, 0, 0, 0.04);
}

.custom-select-option.selected {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-primary);
    font-weight: 700;
}

[data-theme="light"] .custom-select-option.selected {
    background: rgba(2, 132, 199, 0.1);
}

.timer-setting-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
}

.timer-setting-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
}

#custom-timer-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: fadeIn 0.3s ease;
}

#custom-timer-container.hidden {
    display: none;
}

.btn-icon {
    background: var(--accent-primary);
    color: var(--bg-main);
    border: none;
    border-radius: 8px;
    width: 32px;
    height: 32px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 800;
}

.btn-premium {
    background: var(--accent-primary);
    color: var(--bg-main);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s var(--spring);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
    filter: brightness(1.1);
}

.btn-premium:active {
    transform: translateY(0) scale(0.95);
}

/* Switch UI */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--glass-edge);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider { background-color: var(--accent-primary); }
input:checked + .slider:before { transform: translateX(20px); }

.menu-footer {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* --- Hero Section Perfected --- */
.hero {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.timer-container {
    position: relative;
    width: clamp(280px, 80vw, 320px);
    height: clamp(280px, 80vw, 320px);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    overflow: visible; /* Allow play button and glow to spill out */
}

.timer-glass {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    /* Luxury circular glass background */
    background: radial-gradient(circle, var(--glass-base) 0%, rgba(255, 255, 255, 0.01) 100%);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-edge);
    z-index: 0;
    clip-path: circle(50%); /* Robust fix for square backdrop-filter artifacts */
}

.timer-visual {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    overflow: visible; /* Allow glow to spill past circles without clipping */
}

.timer-bg {
    fill: none;
    stroke: var(--glass-edge);
    stroke-width: 2.5;
}

.timer-progress {
    fill: none;
    stroke: var(--accent-primary);
    stroke-width: 3.5;
    stroke-linecap: round;
    filter: drop-shadow(0 0 12px var(--accent-glow));
    transition: stroke-dashoffset 1s linear;
}

.timer-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    inset: 0;
    padding-top: 15px; /* Adjust to center the whole group visually */
}

#time-left {
    font-size: 5.5rem;
    font-weight: 800;
    letter-spacing: -4px;
    font-variant-numeric: tabular-nums;
    line-height: 0.8;
    position: relative;
    top: -5px;
}

.timer-unit {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 10px;
}

/* --- Timer Adjust Buttons (Inside Circle) --- */
.timer-adjust-inline {
    display: flex;
    gap: 1.5rem;
    position: relative;
    z-index: 10;
    margin-top: 15px;
}

.timer-adjust-inline button {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-edge);
    color: var(--text-muted);
    font-size: 1.1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    pointer-events: auto;
    transition: all 0.3s var(--spring);
    backdrop-filter: blur(8px);
}

.timer-adjust-inline button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-pure);
    transform: scale(1.1);
    border-color: var(--accent-primary);
}

.timer-adjust-inline button:active {
    transform: scale(0.9);
}

.main-cta {
    position: absolute;
    bottom: -32px;
    width: 80px;
    height: 80px;
    background: var(--text-pure);
    border-radius: 50%;
    border: 8px solid var(--bg-main);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    z-index: 10;
    transition: transform 0.3s var(--spring), box-shadow 0.3s ease, background 0.3s ease;
}

.main-cta:hover {
    box-shadow: 0 16px 40px rgba(56, 189, 248, 0.2);
}

.main-cta:active {
    transform: scale(0.92);
}

.icon-play {
    width: 0; height: 0;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    border-left: 22px solid var(--bg-main);
    margin-left: 6px;
    transition: all 0.2s ease;
}

.state-focused .main-cta {
    background: var(--accent-primary);
}

.state-focused .icon-play {
    width: 20px; height: 20px;
    background: var(--bg-main);
    border: none; margin: 0;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 19h4V5H6v14zm8-14v14h4V5h-4z'/%3E%3C/svg%3E") center/contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 19h4V5H6v14zm8-14v14h4V5h-4z'/%3E%3C/svg%3E") center/contain no-repeat;
}

/* --- Player Card Evolution --- */
.track-info {
    width: fit-content;
    max-width: 100%;
    padding: 0.6rem 1.25rem;
    border-radius: 100px;
    overflow: hidden;
    transition: all 0.5s var(--spring);
    z-index: 40;
    margin-bottom: 2rem;
    margin-top: auto; 
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.track-info.expanded {
    width: 100%;
    padding: 2rem 1.5rem;
    border-radius: var(--radius-player);
    cursor: default;
    box-shadow: none;
}

/* Ensure hero doesn't get squeezed */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

@media (max-height: 700px) {
    .hero {
        min-height: 300px;
        transform: scale(0.9);
    }
    .track-info {
        padding: 1.5rem 1rem;
        margin-bottom: 1rem;
    }
}

.player-content {
    display: flex;
    flex-direction: row;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
    transition: all 0.4s ease;
}

.track-info.expanded .player-content {
    flex-direction: column;
    gap: 0;
}

.category-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.6rem;
    font-weight: 800;
    color: var(--accent-primary);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    background: rgba(56, 189, 248, 0.1);
    padding: 0.4rem 0.8rem;
    border-radius: 100px;
    margin-bottom: 0;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(56, 189, 248, 0.1);
    white-space: nowrap;
}

.track-info.expanded .category-pill {
    font-size: 0.65rem;
    padding: 0.5rem 1.25rem;
    margin-bottom: 1rem;
    letter-spacing: 2px;
}

.category-pill:hover {
    background: rgba(56, 189, 248, 0.2);
    transform: translateY(-2px);
}

.category-pill .chevron {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}


#current-track-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0;
    color: var(--text-pure);
    letter-spacing: -0.2px;
    white-space: nowrap;
    transition: all 0.3s ease;
}

.track-info.expanded #current-track-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
    white-space: normal;
}

.player-status-line {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 0;
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    opacity: 0;
    max-height: 0;
    visibility: hidden;
    overflow: hidden;
    transition: all 0.4s ease;
}

.track-info.expanded .player-status-line {
    opacity: 0.8;
    max-height: 20px;
    margin-bottom: 1.5rem;
    visibility: visible;
}

.player-status-line span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.player-status-line .dot {
    width: 3px;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 50%;
    opacity: 0.5;
}

.player-controls-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
    opacity: 0;
    max-height: 0;
    visibility: hidden;
    overflow: hidden;
    transition: all 0.4s ease;
}

.track-info.expanded .player-controls-row {
    opacity: 1;
    max-height: 100px;
    visibility: visible;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s var(--spring);
    padding: 0.5rem;
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.control-btn.main-ctrl svg {
    width: 28px;
    height: 28px;
    color: var(--text-pure);
}

.control-btn:hover {
    color: var(--text-pure);
    transform: scale(1.1);
}

.control-btn:active {
    transform: scale(0.9);
}

.control-btn.active {
    color: var(--accent-primary);
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.control-btn.mode-1, .control-btn.mode-2 {
    position: relative;
    transform: scale(1.1); /* Slightly larger when active */
}

.control-btn.mode-1::after, .control-btn.mode-2::after {
    content: 'C'; /* Category */
    position: absolute;
    top: -2px;
    right: -2px;
    font-size: 0.5rem;
    font-weight: 800;
    background: var(--accent-primary);
    color: var(--bg-main);
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--bg-main);
}

.control-btn.mode-2::after {
    content: 'G'; /* Global/All */
}

/* Specific overrides for repeat button for better clarity */
#repeat-btn.mode-1::after { content: '1'; }
#repeat-btn.mode-2::after { content: 'A'; }


/* --- Soundscapes Grid Optimized --- */
.categories-section {
    width: 100%;
}

.categories-section h3 {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2.5px;
    margin-bottom: 1.25rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    width: 100%;
}

.category-card {
    padding: 1.5rem 1rem;
    border-radius: var(--radius-card);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s var(--spring);
}

.category-card:active { transform: scale(0.96); }

.category-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.25rem; }
.category-card p { font-size: 0.7rem; color: var(--text-muted); }

/* --- Timer Adjust Center --- */
.timer-adjust {
    position: absolute;
    bottom: -5rem;
    display: flex;
    gap: 0.75rem;
}

.timer-adjust button {
    width: 60px;
    height: 36px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--glass-edge);
    color: var(--text-muted);
    border-radius: 100px;
    font-size: 1.2rem;
    font-weight: 300;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s var(--spring);
}
.timer-adjust button:hover {
    background: rgba(255,255,255,0.06);
    color: var(--text-pure);
}
.timer-adjust button:active {
    transform: scale(0.9);
}

.scroll-indicator {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
    margin-top: 3rem;
    animation: pulseScroll 2.5s infinite ease-in-out;
}

@keyframes pulseScroll {
    0%, 100% { opacity: 0.2; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 0.8; transform: scaleY(1); transform-origin: top; }
}

/* --- Category Modal --- */
#modal-container {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--p-page);
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.modal-content {
    background: var(--bg-main);
    border: 1px solid var(--glass-edge);
    border-radius: var(--radius-card);
    width: 100%;
    max-width: 440px;
    max-height: 80vh;
    padding: 1.5rem;
    position: relative;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.4s var(--spring);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.modal-inner {
    overflow-y: auto;
    flex: 1;
    padding-right: 0.5rem;
}

#modal-container:not(.hidden) .modal-content {
    transform: translateY(0) scale(1);
}

#close-modal {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--glass-base);
    border: 1px solid var(--glass-edge);
    color: var(--text-pure);
    padding: 0.4rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
}

#modal-title {
    font-size: 1.25rem;
    font-weight: 800;
}

.tracks-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.track-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 16px;
    cursor: pointer;
    transition: background 0.2s;
}

.track-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.track-item-img {
    width: 60px;
    height: 45px;
    border-radius: 8px;
    object-fit: cover;
}

.track-item-info {
    flex: 1;
}

.track-item-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.track-item-artist {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.track-item-duration {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    margin-left: auto;
    padding-left: 0.5rem;
    white-space: nowrap;
}

/* --- End Session Screen --- */
#end-screen {
    position: fixed;
    inset: 0;
    z-index: 4000;
    background: rgba(2, 4, 10, 0.85);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--p-page);
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

[data-theme="light"] #end-screen {
    background: rgba(248, 250, 252, 0.85);
}

.end-content {
    text-align: center;
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transform: translateY(30px);
    transition: transform 0.6s var(--spring);
}

#end-screen:not(.hidden) .end-content {
    transform: translateY(0);
}

.end-content .emoji {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
    animation: floatEmoji 4s infinite ease-in-out;
}

@keyframes floatEmoji {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.end-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

.end-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.recommendations {
    width: 100%;
    text-align: left;
    margin-bottom: 3rem;
}

.recommendations h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    margin-bottom: 1rem;
    text-align: center;
}

.rec-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.rec-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-edge);
    border-radius: 16px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: all 0.3s var(--spring);
}

.rec-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(5px);
}

.rec-card img {
    width: 60px;
    height: 45px;
    border-radius: 8px;
    object-fit: cover;
}

.rec-card-info {
    flex: 1;
    text-align: left;
}

.rec-card strong {
    font-size: 1rem;
    display: block;
}

.rec-card small {
    color: var(--accent-primary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

#close-end-screen {
    background: var(--text-pure);
    color: var(--bg-main);
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 100px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s var(--spring);
}

#close-end-screen:hover {
    transform: scale(1.05);
}
#close-end-screen:active {
    transform: scale(0.95);
}

/* --- Global State Management --- */
.state-focused .categories-section, 
.state-focused .timer-adjust,
.state-focused .scroll-indicator {
    opacity: 0;
    pointer-events: none;
    transform: translateY(30px);
}

.state-focused .track-info {
    opacity: 0.4;
    transform: translateY(10px) scale(0.98);
}

.state-focused .track-info:hover {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.hidden { 
    opacity: 0 !important; 
    pointer-events: none !important; 
    visibility: hidden;
}

@media (max-height: 750px) {
    #app { gap: 2rem; padding-top: 3rem; }
    .timer-container { width: 240px; height: 240px; }
    #time-left { font-size: 4rem; }
}

/* --- PWA Installation Toast --- */
.install-toast {
    position: fixed;
    top: 2rem; /* Move to top for a more 'gentle' notification feel, or stay at bottom but float */
    left: 50%;
    transform: translateX(-50%) translateY(-150%);
    width: 90%;
    max-width: 380px;
    z-index: 10000;
    transition: all 0.8s var(--spring);
}

.install-toast:not(.hidden) {
    transform: translateX(-50%) translateY(0);
}

.install-toast .toast-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border: 1px solid var(--glass-edge);
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
}

.toast-icon img {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.toast-text {
    flex: 1;
}

.toast-text strong {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.1rem;
    letter-spacing: -0.5px;
}

.toast-text p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
}

.toast-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#toast-install-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 100px;
    background: var(--text-pure);
    color: var(--bg-main);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

#toast-install-btn:hover {
    transform: scale(1.05);
}

.install-toast .close-icon {
    font-size: 1.5rem;
    opacity: 0.5;
    cursor: pointer;
    background: none;
    border: none;
    color: white;
    padding: 0.25rem;
}

.install-toast .close-icon:hover {
    opacity: 1;
}

@media (max-width: 480px) {
    .install-toast {
        bottom: 1rem;
        width: 95%;
    }
    
    .toast-text p {
        display: none;
    }
}

/* --- Custom YouTube Track Manager Modal & UI --- */
#custom-tracks-modal {
    position: fixed;
    inset: 0;
    z-index: 3001;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--p-page);
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

#custom-tracks-modal:not(.hidden) .modal-content {
    transform: translateY(0) scale(1);
}

#close-custom-tracks {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--glass-base);
    border: 1px solid var(--glass-edge);
    color: var(--text-pure);
    padding: 0.4rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
}

.custom-track-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-edge);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

.glass-input {
    background: var(--glass-base);
    border: 1px solid var(--glass-edge);
    color: var(--text-pure);
    padding: 0.8rem 1rem;
    border-radius: 14px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
}

.glass-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
}

.btn-full {
    width: 100%;
    padding: 0.8rem !important;
    border-radius: 14px !important;
    font-size: 0.95rem !important;
}

.form-error {
    font-size: 0.75rem;
    color: #ef4444;
    font-weight: 600;
    margin-top: -0.25rem;
    animation: fadeIn 0.3s ease;
}

.custom-tracks-section h3 {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.saved-tracks-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.user-track-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-edge);
    border-radius: 16px;
    transition: all 0.2s ease;
}

.user-track-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--accent-primary);
}

.user-track-title {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.delete-track-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.4rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.delete-track-btn:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.delete-track-btn svg {
    width: 16px;
    height: 16px;
}

.track-badge-custom {
    font-size: 0.55rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-primary);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    border: 1px solid rgba(56, 189, 248, 0.1);
    margin-left: 0.5rem;
}

.custom-track-form select.glass-select {
    display: block !important;
    width: 100%;
    background: var(--glass-base);
    border: 1px solid var(--glass-edge);
    color: var(--text-pure);
    padding: 0.8rem 1rem;
    border-radius: 14px;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 14px;
    padding-right: 2.5rem;
}

[data-theme="light"] .custom-track-form select.glass-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    color: #0f172a;
}

[data-theme="light"] .custom-track-form select.glass-select option {
    background: #f8fafc;
    color: #0f172a;
}

.custom-track-form select.glass-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
}

.menu-divider {
    height: 1px;
    background: var(--glass-edge);
    margin: 1rem 0 !important;
    padding: 0 !important;
    cursor: default !important;
    pointer-events: none;
}

.add-custom-trigger-item {
    display: flex;
    align-items: center;
    color: var(--accent-primary) !important;
    font-weight: 700 !important;
    border: 1px dashed rgba(56, 189, 248, 0.3);
    background: rgba(56, 189, 248, 0.03) !important;
}

.add-custom-trigger-item:hover {
    background: rgba(56, 189, 248, 0.08) !important;
    border-color: var(--accent-primary);
}

.custom-track-note {
    margin-top: 1rem;
    font-size: 0.75rem;
    line-height: 1.45;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid var(--glass-edge);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
}

[data-theme="light"] .custom-track-note {
    background: rgba(0, 0, 0, 0.01);
    color: #475569;
}

.custom-track-note span {
    font-size: 0.85rem;
    line-height: 1.2;
}