/* ==========================================================================
   Link Cycler - Swiss Control Panel Design System
   A precision interface for URL cycling
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=DM+Sans:wght@400;500;600;700&display=swap');

/* ==========================================================================
   CSS Custom Properties - Design Tokens
   ========================================================================== */

:root {
    /* Typography */
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing Scale (4px base) */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    /* Two-ring focus indicator with solid colors for WCAG 3:1 contrast */
    --shadow-focus: 0 0 0 2px var(--color-bg-surface), 0 0 0 4px var(--color-primary);
}

/* Light Theme (Default) */
:root, [data-theme="light"] {
    /* Background Layers */
    --color-bg-base: #FAFAFA;
    --color-bg-surface: #FFFFFF;
    --color-bg-elevated: #FFFFFF;
    --color-bg-inset: #F4F4F5;

    /* Text Hierarchy */
    --color-text-primary: #18181B;
    --color-text-secondary: #52525B;
    --color-text-tertiary: #A1A1AA;
    --color-text-inverse: #FFFFFF;

    /* Borders */
    --color-border-default: #E4E4E7;
    --color-border-subtle: #F4F4F5;
    --color-border-strong: #D4D4D8;

    /* Accent Colors */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-alpha: rgba(37, 99, 235, 0.15);

    --color-success: #16A34A;
    --color-success-hover: #15803D;
    --color-success-bg: #F0FDF4;
    --color-success-alpha: rgba(22, 163, 74, 0.15);

    --color-danger: #DC2626;
    --color-danger-hover: #B91C1C;
    --color-danger-bg: #FEF2F2;
    --color-danger-alpha: rgba(220, 38, 38, 0.15);

    --color-warning: #D97706;
    --color-warning-bg: #FFFBEB;

    /* Status Banner */
    --color-banner-bg: #EFF6FF;
    --color-banner-border: #BFDBFE;
    --color-banner-text: #1E40AF;

    /* Interactive States */
    --color-hover-overlay: rgba(0, 0, 0, 0.04);
    --color-active-overlay: rgba(0, 0, 0, 0.08);
}

/* Dark Theme */
[data-theme="dark"] {
    /* Background Layers */
    --color-bg-base: #09090B;
    --color-bg-surface: #18181B;
    --color-bg-elevated: #27272A;
    --color-bg-inset: #0F0F12;

    /* Text Hierarchy */
    --color-text-primary: #FAFAFA;
    --color-text-secondary: #A1A1AA;
    --color-text-tertiary: #71717A;
    --color-text-inverse: #09090B;

    /* Borders */
    --color-border-default: #27272A;
    --color-border-subtle: #1F1F23;
    --color-border-strong: #3F3F46;

    /* Accent Colors (adjusted for dark) */
    --color-primary: #3B82F6;
    --color-primary-hover: #60A5FA;
    --color-primary-alpha: rgba(59, 130, 246, 0.2);

    --color-success: #22C55E;
    --color-success-hover: #4ADE80;
    --color-success-bg: rgba(22, 197, 94, 0.1);
    --color-success-alpha: rgba(34, 197, 94, 0.2);

    --color-danger: #EF4444;
    --color-danger-hover: #F87171;
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    --color-danger-alpha: rgba(239, 68, 68, 0.2);

    --color-warning: #F59E0B;
    --color-warning-bg: rgba(245, 158, 11, 0.1);

    /* Status Banner */
    --color-banner-bg: rgba(59, 130, 246, 0.1);
    --color-banner-border: rgba(59, 130, 246, 0.3);
    --color-banner-text: #93C5FD;

    /* Interactive States */
    --color-hover-overlay: rgba(255, 255, 255, 0.04);
    --color-active-overlay: rgba(255, 255, 255, 0.08);

    /* Shadows (more subtle in dark mode) */
    --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 8px 24px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-base);
    min-height: 100vh;
}

/* ==========================================================================
   App Container & Layout
   ========================================================================== */

.app-container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-4);
    min-height: 100vh;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border-default);
}

.app-title {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

.app-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.app-main {
    min-height: calc(100vh - 200px);
}

/* ==========================================================================
   Theme Toggle
   ========================================================================== */

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    background: var(--color-bg-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background: var(--color-hover-overlay);
    color: var(--color-text-primary);
    border-color: var(--color-border-strong);
}

.theme-toggle:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   Status Banner
   ========================================================================== */

.status-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-6);
    background: var(--color-banner-bg);
    border: 1px solid var(--color-banner-border);
    border-radius: var(--radius-md);
}

.status-banner-text {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-banner-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.status-banner-text::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.9); }
}

.btn-banner {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--space-1) var(--space-3);
    background: transparent;
    border: 1px solid var(--color-banner-border);
    border-radius: var(--radius-sm);
    color: var(--color-banner-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-banner:hover {
    background: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] .btn-banner:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   Page Header
   ========================================================================== */

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.page-header-info {
    flex: 1;
}

.page-title {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.page-subtitle {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    padding: var(--space-2) var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.btn:disabled,
.btn.btn-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Primary Button */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

/* Secondary Button */
.btn-secondary {
    background: var(--color-bg-surface);
    color: var(--color-text-primary);
    border-color: var(--color-border-default);
}

.btn-secondary:hover {
    background: var(--color-bg-inset);
    border-color: var(--color-border-strong);
}

/* Success Button */
.btn-success {
    background: var(--color-success);
    color: var(--color-text-inverse);
    border-color: var(--color-success);
}

.btn-success:hover {
    background: var(--color-success-hover);
    border-color: var(--color-success-hover);
}

/* Danger Button */
.btn-danger {
    background: var(--color-danger);
    color: var(--color-text-inverse);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
    padding: var(--space-2);
}

.btn-ghost:hover {
    background: var(--color-hover-overlay);
    color: var(--color-text-primary);
}

.btn-ghost.btn-danger-hover:hover {
    background: var(--color-danger-alpha);
    color: var(--color-danger);
}

/* Icon Button */
.btn-icon {
    padding: var(--space-2);
    min-width: 32px;
    min-height: 32px;
}

/* Large Button */
.btn-lg {
    padding: var(--space-3) var(--space-5);
    font-size: 0.9375rem;
}

/* ==========================================================================
   Link List
   ========================================================================== */

.link-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.link-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.link-item:hover {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-sm);
}

.link-item-inactive {
    opacity: 0.5;
}

.link-item-inactive .link-item-name,
.link-item-inactive .link-item-url {
    text-decoration: line-through;
    text-decoration-color: var(--color-text-tertiary);
}

/* Drag Handle */
.drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--color-text-tertiary);
    cursor: grab;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.drag-handle:hover {
    color: var(--color-text-secondary);
    background: var(--color-hover-overlay);
}

.drag-handle:active {
    cursor: grabbing;
}

/* Sortable States */
.sortable-ghost {
    opacity: 0.4;
    background: var(--color-primary-alpha);
    border-color: var(--color-primary);
}

.sortable-chosen {
    box-shadow: var(--shadow-lg);
}

.sortable-drag {
    opacity: 1;
}

/* Checkbox */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-custom {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    background: var(--color-bg-surface);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.checkbox:checked + .checkbox-custom {
    background: var(--color-success);
    border-color: var(--color-success);
}

.checkbox:checked + .checkbox-custom::after {
    content: '';
    width: 10px;
    height: 10px;
    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='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

.checkbox:focus-visible + .checkbox-custom {
    box-shadow: var(--shadow-focus);
}

/* Link Content */
.link-item-content {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.link-item-name {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.link-item-url {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Duration Badge */
.link-item-duration {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-1) var(--space-2);
    background: var(--color-bg-inset);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

/* Actions */
.link-item-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-shrink: 0;
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12) var(--space-6);
    text-align: center;
}

.empty-state-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-6);
    background: var(--color-bg-inset);
    border-radius: 50%;
    color: var(--color-text-tertiary);
}

.empty-state-icon svg {
    width: 40px;
    height: 40px;
}

.empty-state-title {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.empty-state-text {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

/* ==========================================================================
   Page Actions
   ========================================================================== */

.page-actions {
    display: flex;
    justify-content: center;
    padding-top: var(--space-4);
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal-backdrop {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    width: 100%;
    max-width: 440px;
    max-height: calc(100vh - var(--space-8));
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border-default);
}

.modal-title {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-tertiary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-hover-overlay);
    color: var(--color-text-primary);
}

.modal-body {
    padding: var(--space-5);
    overflow-y: auto;
}

.modal-body p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.modal-list {
    margin: var(--space-4) 0;
    padding-left: var(--space-5);
    color: var(--color-text-secondary);
}

.modal-list li {
    margin-bottom: var(--space-2);
}

.modal-list strong {
    color: var(--color-text-primary);
    font-weight: 500;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border-default);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.form-input {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-text-tertiary);
}

.form-input:hover {
    border-color: var(--color-border-strong);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.form-input.invalid,
.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--color-danger);
}

.form-input.invalid:focus {
    box-shadow: 0 0 0 3px var(--color-danger-alpha);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-top: var(--space-1);
}

.form-error {
    font-size: 0.75rem;
    color: var(--color-danger);
    margin-top: var(--space-1);
}

.form-warning {
    font-size: 0.75rem;
    color: var(--color-warning);
    margin-top: var(--space-1);
}

/* Validation States (Blazor) */
.valid.modified:not([type=checkbox]) {
    border-color: var(--color-success);
}

.invalid {
    border-color: var(--color-danger);
}

.validation-message {
    font-size: 0.75rem;
    color: var(--color-danger);
    margin-top: var(--space-1);
}

/* ==========================================================================
   Player Page
   ========================================================================== */

.player-container {
    max-width: 560px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-4);
}

.player-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border-default);
}

.player-header-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.player-header-label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
}

.player-header-cycle {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* Now Playing */
.player-now-playing {
    text-align: center;
    margin-bottom: var(--space-8);
}

.player-current-name {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    word-break: break-word;
}

.player-current-url {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    word-break: break-all;
}

/* Player Controls */
.player-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.btn-control {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    padding: 0;
}

.btn-control-main {
    width: 64px;
    height: 64px;
}

.btn-control-main svg {
    width: 24px;
    height: 24px;
}

/* Progress Bar */
.player-progress {
    margin-bottom: var(--space-8);
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background: var(--color-bg-inset);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-2);
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    transition: width 1s linear;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* Playlist */
.player-playlist {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.player-playlist-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-default);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.player-playlist-items {
    max-height: 240px;
    overflow-y: auto;
}

.player-playlist-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: none;
    border-bottom: 1px solid var(--color-border-subtle);
    background: transparent;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.player-playlist-item:last-child {
    border-bottom: none;
}

.player-playlist-item:hover {
    background: var(--color-hover-overlay);
}

.player-playlist-item-active {
    background: var(--color-primary-alpha);
}

.player-playlist-item-active:hover {
    background: var(--color-primary-alpha);
}

.player-playlist-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-border-strong);
    flex-shrink: 0;
}

.player-playlist-item-active .player-playlist-indicator {
    background: var(--color-primary);
    animation: pulse 2s infinite;
}

.player-playlist-name {
    flex: 1;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-playlist-duration {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    flex-shrink: 0;
}

/* Player Error States */
.player-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    padding: var(--space-12) var(--space-6);
    text-align: center;
}

.player-error-message {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

/* Player Error/Warning Banners */
.player-error-banner,
.player-warning-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-6);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.player-error-banner {
    background: var(--color-danger-bg);
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
}

.player-warning-banner {
    background: var(--color-warning-bg);
    border: 1px solid var(--color-warning);
    color: var(--color-warning);
}

.player-error-banner p,
.player-warning-banner p {
    margin: 0;
    flex: 1;
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: 0.8125rem;
}

/* ==========================================================================
   Loading State
   ========================================================================== */

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ==========================================================================
   Blazor Error UI
   ========================================================================== */

#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-4);
    background: var(--color-danger);
    color: white;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    text-align: center;
    z-index: 9999;
}

#blazor-error-ui .reload,
#blazor-error-ui .dismiss {
    color: white;
    margin-left: var(--space-4);
    cursor: pointer;
    text-decoration: underline;
}

.blazor-error-boundary {
    background: var(--color-danger-bg);
    padding: var(--space-4);
    border: 1px solid var(--color-danger);
    border-radius: var(--radius-md);
    color: var(--color-danger);
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

/* ==========================================================================
   Scrollbar Styling (for modern browsers)
   ========================================================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: 4px;
}

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

/* ==========================================================================
   Selection
   ========================================================================== */

::selection {
    background: var(--color-primary-alpha);
    color: var(--color-text-primary);
}

/* ==========================================================================
   Focus Visible
   ========================================================================== */

:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* ==========================================================================
   Auth Guard
   ========================================================================== */

.auth-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.auth-dialog {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    width: 100%;
    max-width: 320px;
    box-shadow: var(--shadow-lg);
}

.auth-dialog h2 {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-6) 0;
    text-align: center;
}

.auth-dialog form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.auth-dialog .form-input {
    text-align: center;
    font-size: 1rem;
    letter-spacing: 0.1em;
}

.auth-dialog .btn {
    width: 100%;
}

.auth-error {
    color: var(--color-error);
    font-size: 0.875rem;
    text-align: center;
    margin-top: calc(-1 * var(--space-2));
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .app-header,
    .btn,
    .status-banner,
    .modal-backdrop {
        display: none !important;
    }
}