/* ==========================================================================
   TTV STUDIO • PROFESSIONAL AI VIDEO GENERATION DESIGN SYSTEM
   ========================================================================== */

:root {
    /* Palette: Obsidian, Deep Slate, Indigo & Electric Cyan */
    --bg-base: #08090d;
    --bg-surface: #0f121d;
    --bg-surface-elevated: #151928;
    --bg-card: #141827;
    --bg-card-hover: #1b2136;
    --bg-input: #0c0f1a;

    --border-subtle: rgba(255, 255, 255, 0.07);
    --border-card: #20273d;
    --border-card-hover: #3b4568;
    --border-focus: #6366f1;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --brand-primary: #6366f1;
    --brand-primary-hover: #4f46e5;
    --brand-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --brand-glow: rgba(99, 102, 241, 0.35);

    --accent-cyan: #06b6d4;
    --accent-violet: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --sidebar-width: 260px;
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Global */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Base App Shell */
.app-layout {
    display: flex;
    min-height: 100vh;
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.12), transparent),
        radial-gradient(circle at 90% 90%, rgba(6, 182, 212, 0.05), transparent);
}

/* ==========================================================================
   1. SIDEBAR COMPONENT
   ========================================================================== */
.app-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 50;
    transition: transform var(--transition-smooth);
}

.sidebar-header {
    padding: 20px 20px 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.brand-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon-box {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(6, 182, 212, 0.25));
    border: 1px solid rgba(99, 102, 241, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #a5b4fc;
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.2);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* Nav Section */
.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

.nav-section-label {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    padding: 14px 10px 6px 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
    width: 100%;
}

.nav-item:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.12);
    border-color: rgba(99, 102, 241, 0.35);
    color: #e0e7ff;
    font-weight: 600;
}

.nav-item.active svg {
    color: #818cf8;
}

.nav-badge {
    margin-left: auto;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--radius-full);
    background: var(--bg-card-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

.nav-tag {
    margin-left: auto;
    font-size: 0.68rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.nav-tag.accent {
    background: rgba(6, 182, 212, 0.18);
    color: #38bdf8;
    border-color: rgba(6, 182, 212, 0.3);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-subtle);
}

.engine-status-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 10px 14px;
}

.engine-status-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 2px;
}

.status-indicator-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
}

.status-indicator-dot.online {
    background: var(--accent-success);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.engine-status-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.engine-details {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* ==========================================================================
   MOBILE BAR & RESPONSIVE DRAWER
   ========================================================================== */
.mobile-topbar {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 58px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    padding: 0 16px;
    align-items: center;
    justify-content: space-between;
    z-index: 40;
}

.mobile-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.05rem;
}

.brand-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--brand-primary);
    border-radius: 50%;
}

.status-pill {
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.status-ready {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    z-index: 45;
}

/* ==========================================================================
   MAIN CONTENT SHELL & ROUTER VIEWS
   ========================================================================== */
.app-main-content {
    flex: 1;
    min-width: 0;
    height: 100vh;
    overflow-y: auto;
    padding: 28px 36px 60px 36px;
}

.view-panel {
    display: none;
    animation: fadeIn 0.25s ease forwards;
}

.view-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-container {
    max-width: 1400px;
    margin: 0 auto;
}

.page-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 16px;
    flex-wrap: wrap;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 0.92rem;
    color: var(--text-secondary);
}

/* Generic Studio Card */
.studio-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.card-section-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.card-section-title svg {
    color: var(--brand-primary);
}

/* ==========================================================================
   2. MAIN GENERATION WORKSPACE (VIEW 1)
   ========================================================================== */
.workspace-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.95fr;
    gap: 28px;
    max-width: 1540px;
    margin: 0 auto;
    align-items: start;
}

.workspace-header {
    margin-bottom: 20px;
}

.quick-preset-chips {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
    flex-wrap: wrap;
}

.chip-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.preset-chip {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.78rem;
    padding: 5px 12px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.preset-chip:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.4);
    color: #c7d2fe;
}

/* Prompt Card & Hero Textarea */
.prompt-card {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.prompt-box-wrapper {
    background: var(--bg-input);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.prompt-box-wrapper:focus-within {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.prompt-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.field-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    letter-spacing: 0.02em;
}

.counter-badge {
    font-size: 0.72rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.hero-prompt-textarea {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.05rem;
    line-height: 1.6;
    resize: vertical;
    min-height: 100px;
}

.hero-prompt-textarea::placeholder {
    color: #475569;
}

/* Controls Grid */
.generation-controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Form Inputs & Selects */
.select-wrapper {
    position: relative;
}

select, input[type="text"], input[type="number"], input[type="password"] {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-card);
    color: var(--text-primary);
    padding: 11px 14px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: all var(--transition-fast);
}

select {
    appearance: none;
    padding-right: 36px;
    cursor: pointer;
}

.select-arrow {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    font-size: 0.65rem;
    color: var(--text-muted);
}

select:focus, input:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Duration Slider */
.slider-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.value-badge {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-cyan);
    font-family: var(--font-mono);
}

.custom-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    accent-color: var(--brand-primary);
}

.custom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--brand-primary);
    border: 2px solid #fff;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.8);
    cursor: pointer;
    transition: transform 0.1s;
}

.custom-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 0.68rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    padding: 2px 2px 0 2px;
}

/* Aspect Ratio Segmented Group */
.aspect-ratio-toggle-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.aspect-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    padding: 10px 8px;
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
}

.aspect-btn:hover {
    border-color: var(--border-card-hover);
    color: var(--text-primary);
}

.aspect-btn.active {
    background: rgba(99, 102, 241, 0.12);
    border-color: var(--brand-primary);
    color: #e0e7ff;
    font-weight: 600;
}

.aspect-box {
    border: 1.5px solid currentColor;
    border-radius: 3px;
    display: inline-block;
    opacity: 0.8;
}

.aspect-16-9 { width: 22px; height: 13px; }
.aspect-9-16 { width: 13px; height: 22px; }
.aspect-1-1 { width: 16px; height: 16px; }

/* Advanced Collapsible Accordion */
.advanced-accordion {
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.advanced-summary {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.advanced-summary:hover {
    color: var(--text-primary);
}

.summary-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.accordion-chevron {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.advanced-accordion[open] .accordion-chevron {
    transform: rotate(90deg);
}

.advanced-content-grid {
    padding: 16px;
    border-top: 1px solid var(--border-subtle);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.seed-input-wrapper {
    display: flex;
    gap: 6px;
}

.icon-btn-inline {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    padding: 0 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn-inline:hover {
    color: var(--text-primary);
    border-color: var(--brand-primary);
}

/* Custom Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    grid-column: span 2;
    padding: 4px 0;
}

.toggle-text-block {
    display: flex;
    flex-direction: column;
}

.toggle-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toggle-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.switch-wrap {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    min-width: 44px;
}

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

.slider-round {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-full);
    transition: 0.3s;
}

.slider-round::before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.switch-wrap input:checked + .slider-round {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.switch-wrap input:checked + .slider-round::before {
    transform: translateX(20px);
    background-color: #fff;
}

/* Primary Generate Button */
.form-action-row {
    margin-top: 4px;
}

.primary-generate-btn {
    width: 100%;
    padding: 16px 28px;
    background: var(--brand-gradient);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 24px var(--brand-glow);
    transition: all var(--transition-smooth);
}

.primary-generate-btn:hover:not(:disabled) {
    box-shadow: 0 6px 32px rgba(99, 102, 241, 0.6);
    transform: translateY(-2px);
}

.primary-generate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.primary-generate-btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    box-shadow: none;
}

/* ==========================================================================
   4. GENERATION STATUS (PROGRESS CARD)
   ========================================================================== */
.progress-card {
    margin-top: 24px;
    border-color: rgba(99, 102, 241, 0.3);
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, var(--bg-card) 100%);
    animation: slideDown 0.3s ease forwards;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.progress-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.stage-info-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.status-pulse-spinner {
    width: 20px;
    height: 20px;
    border: 2.5px solid rgba(99, 102, 241, 0.25);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.progress-main-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}

.progress-sub-title {
    font-size: 0.82rem;
    color: var(--accent-cyan);
    font-weight: 500;
}

.progress-stats {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.progress-percentage {
    font-size: 1.25rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.progress-timer {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.progress-track-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 18px;
}

.progress-track-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--brand-primary), var(--accent-cyan));
    border-radius: var(--radius-full);
    transition: width 0.35s ease;
    box-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
}

/* 4-Step Stepper */
.stage-stepper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.stepper-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
    opacity: 0.45;
    transition: all var(--transition-fast);
}

.step-indicator {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
}

.step-label {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.stepper-step.active {
    opacity: 1;
}

.stepper-step.active .step-indicator {
    background: var(--brand-primary);
    border-color: var(--brand-primary);
    color: #fff;
    box-shadow: 0 0 12px var(--brand-glow);
}

.stepper-step.active .step-label {
    color: var(--accent-cyan);
    font-weight: 600;
}

.stepper-step.done {
    opacity: 0.9;
}

.stepper-step.done .step-indicator {
    background: var(--accent-success);
    border-color: var(--accent-success);
    color: #fff;
}

.stepper-step.done .step-label {
    color: var(--accent-success);
}

/* ==========================================================================
   3. VIDEO PREVIEW COLUMN
   ========================================================================== */
.preview-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.preview-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.video-format-pill {
    font-size: 0.72rem;
    font-weight: 600;
    font-family: var(--font-mono);
    padding: 3px 9px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

/* Player Container */
.player-container {
    width: 100%;
    min-height: 380px;
    background: #040508;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-player-state {
    padding: 36px 24px;
    text-align: center;
    max-width: 380px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.empty-state-graphic {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px dashed var(--border-card);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: 4px;
}

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

.empty-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Generating Loading Overlay */
.generating-player-overlay {
    position: absolute;
    inset: 0;
    background: rgba(8, 9, 13, 0.92);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    z-index: 10;
}

.video-loading-orb {
    position: relative;
    width: 64px;
    height: 64px;
}

.orb-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid transparent;
    border-top-color: var(--brand-primary);
    border-right-color: var(--accent-cyan);
    animation: spin 1.2s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

.orb-core {
    position: absolute;
    inset: 12px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--brand-primary), transparent 70%);
    box-shadow: 0 0 20px var(--brand-glow);
    animation: pulseGlow 1.5s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
    from { transform: scale(0.8); opacity: 0.5; }
    to { transform: scale(1.15); opacity: 1; }
}

.loading-overlay-text {
    font-size: 0.88rem;
    font-weight: 600;
    color: #e2e8f0;
    letter-spacing: 0.01em;
}

/* Active Player */
.active-player-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.active-player-wrapper video {
    width: 100%;
    max-height: 480px;
    border-radius: var(--radius-md);
    outline: none;
    background: #000;
}

/* Action Toolbar */
.preview-action-toolbar {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 8px;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    border: 1px solid var(--border-card);
    transition: all var(--transition-fast);
}

.download-btn {
    background: linear-gradient(135deg, var(--brand-primary), var(--accent-violet));
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.download-btn:hover {
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.5);
    transform: translateY(-1px);
}

.secondary-btn {
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
}

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

/* Scene Breakdown Accordion */
.scene-breakdown-card {
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.scene-breakdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.scene-title {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary);
}

.scene-count-badge {
    font-size: 0.72rem;
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.scenes-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.scene-item-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--brand-primary);
    border-radius: 6px;
    padding: 10px 12px;
}

.scene-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}

.scene-heading {
    font-size: 0.82rem;
    font-weight: 600;
    color: #e2e8f0;
}

.scene-motion-tag {
    font-size: 0.68rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    padding: 2px 6px;
    border-radius: 4px;
}

.scene-narrative {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ==========================================================================
   5. HISTORY VIEW (VIEW 2)
   ========================================================================== */
.history-filter-bar {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search-input {
    min-width: 240px;
    padding: 8px 14px;
}

.danger-outline-btn {
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
    cursor: pointer;
}

.danger-outline-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.history-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-smooth);
}

.history-card:hover {
    border-color: var(--border-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

.history-thumb-box {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    position: relative;
    overflow: hidden;
}

.history-thumb-box video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.history-card-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.history-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.history-model-tag {
    font-size: 0.7rem;
    font-weight: 600;
    color: #a5b4fc;
    background: rgba(99, 102, 241, 0.15);
    padding: 2px 8px;
    border-radius: 4px;
}

.history-date {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.history-prompt {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.history-specs-row {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.spec-badge {
    font-size: 0.68rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    padding: 2px 7px;
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
}

.history-actions-row {
    margin-top: auto;
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 6px;
    padding-top: 8px;
    border-top: 1px solid var(--border-subtle);
}

.empty-history-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

/* ==========================================================================
   6. MODELS VIEW (VIEW 3)
   ========================================================================== */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 24px;
}

.model-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.featured-model {
    border-color: rgba(99, 102, 241, 0.4);
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, var(--bg-card) 100%);
}

.model-badge {
    align-self: flex-start;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
}

.model-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.model-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.model-specs {
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
}

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

.spec-val {
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.model-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 8px;
}

.badge {
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-info {
    background: rgba(6, 182, 212, 0.15);
    color: #38bdf8;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.78rem;
}

/* ==========================================================================
   7. TRAINING & FINE-TUNING VIEW (VIEW 4)
   ========================================================================== */
.training-dashboard-layout {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: 28px;
    align-items: start;
}

.training-config-col, .training-metrics-col {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.training-status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    font-size: 0.8rem;
    font-weight: 600;
}

.dataset-dropzone {
    border: 2px dashed var(--border-card-hover);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    background: var(--bg-input);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.dataset-dropzone:hover {
    border-color: var(--brand-primary);
    background: rgba(99, 102, 241, 0.05);
}

.dropzone-prompt {
    font-size: 0.88rem;
    color: var(--text-primary);
}

.dropzone-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.dataset-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 14px;
}

.stat-pill {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 10px 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-size: 0.92rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.stat-lbl {
    font-size: 0.68rem;
    color: var(--text-muted);
}

.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 14px;
}

.form-grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.training-btn-row {
    margin-top: 6px;
}

.metrics-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.terminal-log-window {
    background: #040508;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 160px;
}

.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent-cyan); }
.highlight-green { color: var(--accent-success); font-weight: 700; }

.benchmarks-table {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.benchmark-row {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1.2fr;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
}

.bm-val {
    font-family: var(--font-mono);
    font-weight: 600;
}

.bm-target {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.checkpoints-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.checkpoint-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.ckpt-meta {
    display: flex;
    flex-direction: column;
}

.ckpt-name {
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.ckpt-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* ==========================================================================
   8. RL FEEDBACK STUDIO (VIEW 5)
   ========================================================================== */
.iteration-badge {
    display: flex;
    align-items: center;
}

.badge-accent {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.4);
}

.rl-comparison-workspace {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.rl-prompt-bar {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.prompt-bar-tag {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--brand-primary);
}

.prompt-bar-text {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-style: italic;
}

.candidates-comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.candidate-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: all var(--transition-fast);
}

.candidate-card.selected {
    border-color: var(--accent-success);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

.candidate-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.candidate-tag {
    font-size: 0.78rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
}

.tag-a { background: rgba(99, 102, 241, 0.2); color: #a5b4fc; }
.tag-b { background: rgba(6, 182, 212, 0.2); color: #38bdf8; }

.reward-pill {
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-success);
    background: rgba(16, 185, 129, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.candidate-video-box {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.candidate-video-box video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.candidate-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 8px;
    font-size: 0.75rem;
    text-align: center;
}

.preference-vote-btn {
    width: 100%;
    padding: 12px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.preference-vote-btn:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--brand-primary);
}

.candidate-card.selected .preference-vote-btn {
    background: var(--accent-success);
    border-color: var(--accent-success);
    color: #fff;
}

.rl-summary-card {
    padding: 18px 24px;
}

.rl-summary-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.reward-weights-pills {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.weight-chip {
    font-size: 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
}

.feedback-history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feedback-item {
    display: grid;
    grid-template-columns: 80px 1.5fr 160px 140px;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.fb-time { font-family: var(--font-mono); color: var(--text-muted); }
.fb-prompt { color: var(--text-primary); }
.fb-reward { font-family: var(--font-mono); color: var(--accent-success); }

/* ==========================================================================
   9. SETTINGS VIEW (VIEW 6)
   ========================================================================== */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.provider-readout-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.readout-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.code-pill {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 8px;
    border-radius: 4px;
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
}

.toast {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-card-hover);
    color: var(--text-primary);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast.toast-success {
    border-left: 4px solid var(--accent-success);
}

.toast.toast-error {
    border-left: 4px solid var(--accent-danger);
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Button & Icon Utilities */
.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: var(--radius-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--brand-primary);
    color: #fff;
}

.btn-secondary {
    background: var(--bg-surface-elevated);
    border-color: var(--border-card);
    color: var(--text-primary);
}

.hidden {
    display: none !important;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1100px) {
    .workspace-layout {
        grid-template-columns: 1fr;
    }
    .training-dashboard-layout {
        grid-template-columns: 1fr;
    }
    .settings-grid {
        grid-template-columns: 1fr;
    }
    .candidates-comparison-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 820px) {
    .app-sidebar {
        position: fixed;
        transform: translateX(-100%);
        box-shadow: 10px 0 30px rgba(0, 0, 0, 0.6);
    }
    .app-sidebar.open {
        transform: translateX(0);
    }
    .sidebar-backdrop.active {
        display: block;
    }
    .mobile-topbar {
        display: flex;
    }
    .app-main-content {
        padding: 76px 16px 40px 16px;
    }
    .generation-controls-grid {
        grid-template-columns: 1fr;
    }
    .preview-action-toolbar {
        grid-template-columns: 1fr 1fr;
    }
    .dataset-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}