/* ==========================================================================
   MusicStreaming — Dark Theme
   CSS Custom Properties + Responsive Breakpoints
   ========================================================================== */

/* --------------------------------------------------------------------------
   Color Palette
   -------------------------------------------------------------------------- */
:root {
    /* Primary accent */
    --color-primary: #7fd46f;
    --color-primary-hover: #97e184;
    --color-primary-active: #66b85a;
    --color-primary-muted: rgba(127, 212, 111, 0.22);

    /* Backgrounds */
    --color-background: #11151f;
    --color-surface: #1a212f;
    --color-surface-hover: #242d3d;
    --color-surface-raised: #2b3649;
    --color-surface-overlay: rgba(9, 12, 20, 0.72);

    /* Text */
    --color-text: #edf1f8;
    --color-text-secondary: #b4bfd3;
    --color-text-muted: #8090ab;
    --color-text-on-primary: #ffffff;

    /* Borders */
    --color-border: #33435d;
    --color-border-hover: #46607f;
    --color-border-strong: #5f7899;

    /* Semantic */
    --color-success: #47d788;
    --color-warning: #f2c563;
    --color-error: #ff7d7d;
    --color-info: #74c7f7;

    /* Player */
    --color-player-bg: #1f2735;
    --color-player-progress: var(--color-primary);
    --color-player-progress-bg: #4a576f;
    --color-player-buffer: #5b6b85;
    --color-panel-gradient-start: #2d394d;
    --color-panel-gradient-end: #1f2838;
    --color-control-gradient-start: #3a465c;
    --color-control-gradient-end: #2a3448;

    /* Scrollbar */
    --color-scrollbar: #4a5e7a;
    --color-scrollbar-hover: #6280a3;

    /* --------------------------------------------------------------------------
       Spacing
       -------------------------------------------------------------------------- */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* --------------------------------------------------------------------------
       Typography
       -------------------------------------------------------------------------- */
    --font-family: 'Trebuchet MS', Tahoma, Verdana, 'Segoe UI', sans-serif;
    --font-family-display: 'Verdana', Tahoma, 'Segoe UI', sans-serif;
    --font-family-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --line-height: 1.5;
    --line-height-tight: 1.25;

    /* --------------------------------------------------------------------------
       Border Radius
       -------------------------------------------------------------------------- */
    --radius-sm: 0.2rem;
    --radius-md: 0.38rem;
    --radius-lg: 0.55rem;
    --radius-xl: 0.8rem;
    --radius-full: 9999px;

    /* --------------------------------------------------------------------------
       Shadows
       -------------------------------------------------------------------------- */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.6);

    /* --------------------------------------------------------------------------
       Transitions
       -------------------------------------------------------------------------- */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* --------------------------------------------------------------------------
       Z-Index Layers
       -------------------------------------------------------------------------- */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-player: 500;
    --z-toast: 600;

    /* --------------------------------------------------------------------------
       Layout
       -------------------------------------------------------------------------- */
    --header-height: 3.2rem;
    --mini-player-height: 4.15rem;
    --sidebar-width: 15rem;
    --sidebar-width-collapsed: 3.5rem;
    --content-max-width: 80rem;
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    color-scheme: dark;
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-background);
    background-image: radial-gradient(circle at 18% -14%, rgba(116, 199, 247, 0.12), transparent 45%),
        radial-gradient(circle at 82% -10%, rgba(127, 212, 111, 0.1), transparent 40%),
        linear-gradient(180deg, #1a2231 0%, #11151f 55%, #0d1119 100%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Scrollbar (Webkit + Firefox)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-scrollbar-hover);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-scrollbar) transparent;
}

/* --------------------------------------------------------------------------
   Typography Utilities
   -------------------------------------------------------------------------- */
.text-ellipsis {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.text-secondary {
    color: var(--color-text-secondary);
}

.text-muted {
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Focus Styles (Accessibility)
   -------------------------------------------------------------------------- */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Button Resets & Base
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: var(--line-height-tight);
    cursor: pointer;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
    user-select: none;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-on-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
}

.btn-primary:active:not(:disabled) {
    background-color: var(--color-primary-active);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-surface-hover);
    color: var(--color-text);
}

.btn-icon {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-icon:hover:not(:disabled) {
    background-color: var(--color-surface-hover);
    color: var(--color-text);
}

.action-btn {
    width: 2rem;
    height: 2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.action-btn:hover:not(:disabled),
.action-btn:focus-visible:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-border);
    color: var(--color-text);
}

.action-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.action-btn svg {
    width: 1rem;
    height: 1rem;
}

/* --------------------------------------------------------------------------
   Library Context Menus - shared
   -------------------------------------------------------------------------- */
.track-context-menu {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.track-context-menu-popover {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    z-index: var(--z-dropdown);
    min-width: 15rem;
    padding: 0.4rem;
    border: 1px solid var(--color-border, rgba(255, 255, 255, 0.12));
    border-radius: 0.85rem;
    background: var(--color-surface-elevated, rgba(16, 22, 33, 0.96));
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.28);
}

.track-context-menu-item,
.track-context-submenu-item {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.7rem 0.85rem;
    border: none;
    border-radius: 0.65rem;
    background: transparent;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
}

.track-context-menu-item:hover,
.track-context-submenu-item:hover {
    background: rgba(255, 255, 255, 0.07);
}

.track-context-menu-item:disabled,
.track-context-submenu-item:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.track-context-submenu {
    margin: 0.35rem 0 0.5rem;
    padding: 0.35rem;
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.04);
}

.track-context-submenu-divider {
    height: 1px;
    margin: 0.35rem 0;
    background: var(--color-border, rgba(255, 255, 255, 0.12));
}

.track-context-submenu-item-accent {
    color: var(--color-primary, #7bd3ff);
}

.track-context-menu-hint,
.track-context-status {
    display: block;
    padding: 0.55rem 0.85rem;
    font-size: 0.875rem;
}

.track-context-menu-hint {
    color: var(--color-text-muted, rgba(255, 255, 255, 0.7));
}

.track-context-status-success {
    color: var(--color-success, #79d18c);
}

.track-context-status-error {
    color: var(--color-error, #ff9c9c);
}

.track-context-chevron {
    flex: 0 0 auto;
    width: 1rem;
    height: 1rem;
}

@media (max-width: 720px) {
    .track-context-menu-popover {
        min-width: min(15rem, 80vw);
    }
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints (mobile-first)
   -------------------------------------------------------------------------- */

/* Tablet: 768px+ */
@media (min-width: 768px) {
    :root {
        --header-height: 4rem;
    }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
    :root {
        --sidebar-width: 16rem;
    }
}

/* Large Desktop: 1440px+ */
@media (min-width: 1440px) {
    :root {
        --content-max-width: 90rem;
    }
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* --------------------------------------------------------------------------
   Marquee Animation (for long track titles)
   -------------------------------------------------------------------------- */
@keyframes marquee {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-100%);
    }
}

.marquee-container {
    overflow: hidden;
    white-space: nowrap;
}

.marquee-text {
    display: inline-block;
    animation: marquee 12s linear infinite;
    animation-play-state: paused;
}

.marquee-container:hover .marquee-text {
    animation-play-state: running;
}