/* ============================================
   SOPRANO TTS DEMO - NEURAL OBSERVATORY THEME
   ============================================ */

/* Design Tokens */
:root {
    /* Colors - Space & Neural */
    --color-void: #050810;
    --color-deep: #0a0f1a;
    --color-surface: rgba(15, 23, 42, 0.85);
    --color-surface-elevated: rgba(30, 41, 59, 0.9);
    --color-glass-border: rgba(255, 255, 255, 0.08);

    /* Gradient Spectrum */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-primary-vivid: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    --gradient-glow: linear-gradient(135deg, rgba(59, 130, 246, 0.4) 0%, rgba(139, 92, 246, 0.4) 100%);

    /* Accent Colors */
    --color-blue: #3b82f6;
    --color-violet: #8b5cf6;
    --color-cyan: #22d3ee;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Text */
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    /* Typography */
    --font-display: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --font-mono: 'Space Mono', monospace;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow-blue: 0 0 40px rgba(59, 130, 246, 0.3);
    --shadow-glow-violet: 0 0 40px rgba(139, 92, 246, 0.3);

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-base: 250ms;
    --duration-slow: 400ms;
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-void);
    color: var(--color-text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   AMBIENT BACKGROUND
   ============================================ */
.ambient-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: orb-float 20s ease-in-out infinite;
}

.orb--primary {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.35) 0%, transparent 70%);
    top: -15%;
    right: -10%;
    animation-delay: 0s;
}

.orb--secondary {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
    bottom: -10%;
    left: -10%;
    animation-delay: -7s;
}

.orb--tertiary {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.2) 0%, transparent 70%);
    top: 40%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: -14s;
}

@keyframes orb-float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -40px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(40px, 30px) scale(1.02);
    }
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ============================================
   APP SHELL
   ============================================ */
.app-shell {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    animation: shell-enter 0.8s var(--ease-out) both;
}

@keyframes shell-enter {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   HERO HEADER
   ============================================ */
.hero {
    text-align: center;
    margin-bottom: var(--space-10);
}

.hero__brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

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

.logo__icon {
    width: 40px;
    height: 40px;
    filter: drop-shadow(0 0 12px rgba(139, 92, 246, 0.5));
}

.logo__text {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero__tagline {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================
   DEVICE SELECTION
   ============================================ */
.device-section {
    margin-bottom: var(--space-8);
}

.device-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.device-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--color-surface);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-out);
    text-align: left;
    color: var(--color-text-primary);
    font-family: inherit;
}

.device-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background: var(--gradient-primary);
    opacity: 0;
    z-index: -1;
    transition: opacity var(--duration-base) var(--ease-out);
}

.device-card:hover {
    background: var(--color-surface-elevated);
    transform: translateY(-2px);
}

.device-card:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
}

.device-card[aria-checked="true"] {
    border-color: transparent;
    background: rgba(59, 130, 246, 0.1);
}

.device-card[aria-checked="true"]::before {
    opacity: 1;
}

.device-card[aria-checked="true"] .device-card__check {
    opacity: 1;
    transform: scale(1);
}

.device-card[aria-disabled="true"] {
    opacity: 0.4;
    cursor: not-allowed;
}

.device-card[aria-disabled="true"]:hover {
    transform: none;
}

.device-card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-surface-elevated);
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.device-card__icon svg {
    width: 28px;
    height: 28px;
}

.device-card[aria-checked="true"] .device-card__icon {
    background: var(--gradient-primary);
    color: white;
}

.device-card__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.device-card__name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
}

.device-card__sub {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.device-card__speed {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    color: white;
    width: fit-content;
    margin-top: var(--space-1);
}

.device-card__check {
    width: 24px;
    height: 24px;
    color: var(--color-success);
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--duration-base) var(--ease-bounce);
}

/* GPU Banner */
.gpu-banner {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.gpu-banner--available {
    border-color: rgba(16, 185, 129, 0.3);
    background: rgba(16, 185, 129, 0.08);
}

.gpu-banner--unavailable {
    border-color: rgba(245, 158, 11, 0.3);
    background: rgba(245, 158, 11, 0.08);
}

.gpu-banner__icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.gpu-banner--available .gpu-banner__icon {
    color: var(--color-success);
}

.gpu-banner--unavailable .gpu-banner__icon {
    color: var(--color-warning);
}

.gpu-banner__content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.gpu-banner__content strong {
    color: var(--color-text-primary);
}

.gpu-banner__content span {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   INPUT SECTION
   ============================================ */
.input-section {
    margin-bottom: var(--space-8);
}

.textarea-wrap {
    position: relative;
    margin-bottom: var(--space-4);
}

textarea {
    width: 100%;
    min-height: 120px;
    padding: var(--space-4);
    padding-bottom: var(--space-8);
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    transition: all var(--duration-base) var(--ease-out);
}

textarea::placeholder {
    color: var(--color-text-muted);
}

textarea:focus {
    outline: none;
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.textarea-meta {
    position: absolute;
    bottom: var(--space-3);
    right: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.char-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Sample Texts */
.sample-texts {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.sample-texts__label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.sample-btn {
    padding: var(--space-1) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.sample-btn:hover {
    background: var(--color-surface-elevated);
    color: var(--color-text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

.sample-btn:active {
    transform: scale(0.97);
}

/* Controls */
.controls {
    display: flex;
    gap: var(--space-3);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--duration-base) var(--ease-out);
}

.btn__icon {
    width: 18px;
    height: 18px;
}

.btn--primary {
    flex: 1;
    position: relative;
    background: var(--gradient-primary);
    color: white;
    overflow: hidden;
}

.btn--primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--duration-fast);
}

.btn--primary:hover:not(:disabled)::before {
    opacity: 1;
}

.btn--primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
}

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

.btn--primary.btn--generating {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }
    50% {
        box-shadow: 0 0 0 15px rgba(59, 130, 246, 0);
    }
}

.btn--secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-glass-border);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--color-surface-elevated);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn__loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

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

/* ============================================
   OUTPUT SECTION
   ============================================ */
.output-section {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

/* Visualizer Panel */
.visualizer-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

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

.visualizer-panel__title {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

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

.status-indicator--idle .status-dot {
    background: var(--color-text-muted);
}

.status-indicator--running .status-dot {
    background: var(--color-success);
    animation: dot-pulse 1.5s ease-in-out infinite;
}

.status-indicator--error .status-dot {
    background: var(--color-error);
}

@keyframes dot-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.status-text {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.visualizer-container {
    position: relative;
    height: 160px;
    background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.03) 100%);
}

.visualizer-container canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.visualizer-bars {
    opacity: 0.7;
    mix-blend-mode: screen;
}

/* Metrics Panel */
.metrics-panel {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.metrics-panel__title {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.metric {
    padding: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
}

.metric--highlight {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-color: rgba(139, 92, 246, 0.2);
}

.metric__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2);
}

.metric__label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.metric__info {
    width: 16px;
    height: 16px;
    padding: 0;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: help;
    position: relative;
}

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

.metric__info::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    right: 0;
    width: 200px;
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-align: left;
    line-height: 1.4;
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: all var(--duration-fast) var(--ease-out);
    z-index: 10;
    pointer-events: none;
}

.metric__info:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.metric__value {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
}

.metric__number {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric__number--large {
    font-size: 2.25rem;
}

.metric__unit {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.metric__bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    margin-top: var(--space-3);
    overflow: hidden;
}

.metric__bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-out);
    width: 0%;
}

.metric__context {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

.metric--status {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.model-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.model-status__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-muted);
}

.model-status--loading .model-status__dot {
    background: var(--color-warning);
    animation: dot-pulse 1s ease-in-out infinite;
}

.model-status--ready .model-status__dot {
    background: var(--color-success);
}

.model-status__text {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    margin-top: auto;
    padding-top: var(--space-8);
    text-align: center;
}

.footer p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .app-shell {
        padding: var(--space-6) var(--space-4);
    }

    .logo__text {
        font-size: 2rem;
    }

    .device-cards {
        grid-template-columns: 1fr;
    }

    .output-section {
        grid-template-columns: 1fr;
    }

    .metrics-panel {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .metric:last-child {
        grid-column: span 2;
    }
}

@media (max-width: 480px) {
    .hero__brand {
        flex-direction: column;
        gap: var(--space-3);
    }

    .controls {
        flex-direction: column;
    }

    .btn--primary {
        width: 100%;
    }

    .sample-texts {
        flex-direction: column;
        align-items: flex-start;
    }

    .sample-btn {
        width: 100%;
        text-align: center;
    }

    .metrics-panel {
        grid-template-columns: 1fr;
    }

    .metric:last-child {
        grid-column: span 1;
    }

    .metric__number {
        font-size: 1.5rem;
    }

    .metric__number--large {
        font-size: 1.75rem;
    }
}