/* ============================================================
   Hugging Trace Viewer — Premium Dark Mode Design
   ============================================================ */

/* --- Design Tokens --- */
:root {
    /* Color Palette */
    --bg-primary: #0b0e14;
    --bg-secondary: #111621;
    --bg-tertiary: #161b27;
    --bg-card: rgba(22, 27, 39, 0.7);
    --bg-card-hover: rgba(30, 37, 55, 0.85);
    --bg-glass: rgba(22, 27, 39, 0.55);
    --bg-glass-border: rgba(255, 255, 255, 0.06);

    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --text-link: #79c0ff;

    --accent-primary: #f5a623;
    --accent-secondary: #ff7b00;
    --accent-gradient: linear-gradient(135deg, #f5a623 0%, #ff7b00 100%);
    --accent-glow: rgba(245, 166, 35, 0.15);

    --perfetto-blue: #4285f4;
    --perfetto-gradient: linear-gradient(135deg, #4285f4 0%, #8b5cf6 100%);

    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;

    --border-default: rgba(255, 255, 255, 0.08);
    --border-subtle: rgba(255, 255, 255, 0.04);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::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-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background ambient glow */
body::before {
    content: '';
    position: fixed;
    top: -30%;
    left: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(
        ellipse at center,
        rgba(245, 166, 35, 0.04) 0%,
        transparent 70%
    );
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -30%;
    right: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(
        ellipse at center,
        rgba(66, 133, 244, 0.03) 0%,
        transparent 70%
    );
    pointer-events: none;
    z-index: 0;
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--accent-primary); }

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--accent-primary);
}

.hidden { display: none !important; }

/* --- Glass Card --- */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--bg-glass-border);
    border-radius: var(--radius-lg);
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* --- Header --- */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-default);
}

.header-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-emoji {
    font-size: 28px;
    line-height: 1;
}

.logo-text h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    font-weight: 400;
    margin-top: 1px;
}

.header-link {
    color: var(--text-tertiary);
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.header-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px 48px;
    position: relative;
    z-index: 1;
}

/* --- Source Section --- */
.source-section {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 50vh;
    padding-top: 8vh;
}

.source-card {
    width: 100%;
    max-width: 620px;
    padding: 40px;
    text-align: center;
}

.source-title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.source-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

/* Tabs */
.input-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    background: rgba(245, 166, 35, 0.12);
    color: var(--accent-primary);
}

/* Input */
.input-row {
    display: flex;
    gap: 10px;
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast);
    overflow: hidden;
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-prefix {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text-tertiary);
    padding: 0 2px 0 14px;
    user-select: none;
    white-space: nowrap;
    flex-shrink: 0;
}

#source-input {
    width: 100%;
    padding: 12px 14px 12px 4px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    outline: none;
}

#source-input::placeholder {
    color: var(--text-tertiary);
}

.input-hint {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-top: 10px;
    text-align: left;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #111;
    box-shadow: 0 2px 12px rgba(245, 166, 35, 0.25);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(245, 166, 35, 0.35);
}
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-perfetto {
    background: var(--perfetto-gradient);
    color: white;
    box-shadow: 0 2px 12px rgba(66, 133, 244, 0.3);
}
.btn-perfetto:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(66, 133, 244, 0.4);
}

.btn-sm {
    padding: 7px 14px;
    font-size: 0.8rem;
}

.btn-icon {
    padding: 8px;
    min-width: 36px;
    min-height: 36px;
}

/* --- Traces Section --- */
.traces-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
    flex-wrap: wrap;
}

.traces-info {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.traces-info h2 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.trace-count {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    font-weight: 500;
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 10px;
    border-radius: 100px;
}

.traces-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 0 12px;
    transition: border-color var(--transition-fast);
    color: var(--text-tertiary);
}

.search-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

#search-input {
    padding: 9px 0;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    outline: none;
    width: 180px;
}

#search-input::placeholder { color: var(--text-tertiary); }

/* --- Breadcrumb Navigation Bar --- */
.breadcrumb-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.nav-buttons {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

.btn-nav {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-tertiary);
    padding: 5px 7px;
    min-width: 28px;
    min-height: 28px;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.btn-nav:hover:not(:disabled) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-default);
}

.btn-nav:disabled {
    opacity: 0.25;
    cursor: not-allowed;
}

.breadcrumb-path {
    display: flex;
    align-items: center;
    gap: 0;
    flex-wrap: wrap;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    overflow: hidden;
    min-width: 0;
}

.breadcrumb-item {
    color: var(--text-link);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.breadcrumb-item:hover {
    color: var(--accent-primary);
    background: rgba(245, 166, 35, 0.08);
}

.breadcrumb-current {
    color: var(--text-primary);
    cursor: default;
    font-weight: 500;
}

.breadcrumb-current:hover {
    color: var(--text-primary);
    background: transparent;
}

.breadcrumb-root {
    color: var(--accent-primary);
    font-weight: 500;
}

.breadcrumb-sep {
    color: var(--text-tertiary);
    margin: 0 1px;
    opacity: 0.5;
    user-select: none;
}

/* --- Trace List --- */
.trace-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.trace-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: default;
}

.trace-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-default);
    transform: translateX(4px);
}

.trace-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.trace-icon.file {
    background: rgba(66, 133, 244, 0.1);
    color: var(--perfetto-blue);
}

.trace-icon.directory {
    background: rgba(245, 166, 35, 0.1);
    color: var(--accent-primary);
}

.trace-details {
    flex: 1;
    min-width: 0;
}

.trace-name {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.trace-meta {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    margin-top: 2px;
    display: flex;
    gap: 12px;
}

.trace-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.9rem;
    max-width: 400px;
    margin: 0 auto;
}

/* Error state */
.error-state {
    text-align: center;
    padding: 40px 20px;
    background: rgba(248, 81, 73, 0.06);
    border: 1px solid rgba(248, 81, 73, 0.15);
    border-radius: var(--radius-md);
}

.error-state h3 {
    color: var(--danger);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.error-state p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* --- Loading Overlay --- */
.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(11, 14, 20, 0.8);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.loading-card {
    padding: 40px 48px;
    text-align: center;
    min-width: 320px;
}

.loader-ring {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.08);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
    margin: 0 auto 20px;
}

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

.loading-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.loading-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* Progress Bar */
.progress-container {
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 100px;
    transition: width 200ms ease-out;
    width: 0%;
}

.progress-text {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
    min-width: 48px;
    text-align: right;
}

/* --- Perfetto Overlay --- */
.perfetto-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.perfetto-card {
    padding: 40px 48px;
    text-align: center;
    min-width: 380px;
}

.perfetto-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.perfetto-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.perfetto-card > p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 24px;
}

.perfetto-steps {
    text-align: left;
    margin-bottom: 24px;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
}

.step:last-child { border-bottom: none; }

.step-indicator {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 12px;
    transition: all var(--transition-base);
}

.step-indicator.pending {
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid var(--text-tertiary);
}

.step-indicator.active {
    background: rgba(245, 166, 35, 0.15);
    border: 2px solid var(--accent-primary);
    animation: pulse-ring 1.5s ease-in-out infinite;
}

.step-indicator.done {
    background: rgba(63, 185, 80, 0.15);
    border: 2px solid var(--success);
}

.step-indicator.done::after {
    content: '✓';
    color: var(--success);
    font-weight: 700;
}

.step-indicator.error {
    background: rgba(248, 81, 73, 0.15);
    border: 2px solid var(--danger);
}

.step-indicator.error::after {
    content: '✗';
    color: var(--danger);
    font-weight: 700;
}

.step.active-step span:last-child { color: var(--text-primary); }
.step.done-step span:last-child { color: var(--success); }

@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 0 0 rgba(245, 166, 35, 0.3); }
    50% { box-shadow: 0 0 0 6px rgba(245, 166, 35, 0); }
}

.perfetto-card .btn {
    width: 100%;
    margin-top: 8px;
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    z-index: 500;
    opacity: 0;
    transition: all var(--transition-base);
    pointer-events: none;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* --- Footer --- */
.app-footer {
    text-align: center;
    padding: 20px;
    color: var(--text-tertiary);
    font-size: 0.82rem;
    border-top: 1px solid var(--border-subtle);
    position: relative;
    z-index: 1;
}

.app-footer a {
    color: var(--text-secondary);
}
.app-footer a:hover {
    color: var(--accent-primary);
}

/* --- Responsive --- */
@media (max-width: 640px) {
    .header-content { padding: 12px 16px; }
    .main-content { padding: 20px 16px 40px; }
    .source-card { padding: 28px 20px; }
    .source-title { font-size: 1.3rem; }

    .input-row { flex-direction: column; }
    .btn { width: 100%; }

    .traces-header { flex-direction: column; align-items: stretch; }
    .traces-actions { flex-direction: column; }
    #search-input { width: 100%; }

    .trace-item { flex-direction: column; align-items: stretch; gap: 10px; }
    .trace-actions { justify-content: flex-end; }

    .perfetto-card, .loading-card { min-width: 0; padding: 28px 20px; margin: 0 16px; }
}