/* ── Design System ──────────────────────────────────────────── */

:root {
    --bg-primary:    #0a0e1a;
    --bg-secondary:  #111827;
    --bg-card:       #1a2235;
    --bg-card-hover: #1e2840;
    --bg-input:      #0f1629;

    --border:        #2a3452;
    --border-hover:  #3b4a70;

    --text-primary:  #f1f5f9;
    --text-secondary:#8899b4;
    --text-muted:    #5a6a85;

    --accent-blue:   #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green:  #10b981;
    --accent-red:    #ef4444;
    --accent-amber:  #f59e0b;
    --accent-cyan:   #06b6d4;

    --font-sans:     'Inter', -apple-system, sans-serif;
    --font-mono:     'JetBrains Mono', monospace;

    --radius-sm:     6px;
    --radius-md:     10px;
    --radius-lg:     16px;
    --radius-xl:     20px;

    --shadow-card:   0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow:   0 0 20px rgba(59, 130, 246, 0.15);
}

/* ── Reset & Base ──────────────────────────────────────────── */

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ── Header ────────────────────────────────────────────────── */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(12px);
}

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

.brand-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.brand-title {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.brand-version {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

.header-actions {
    display: flex;
    gap: 8px;
}

/* ── Main Content ──────────────────────────────────────────── */

.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

/* ── Cards ─────────────────────────────────────────────────── */

.input-card, .mistakes-card, .rewrite-card, .loading-card, .error-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-card);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.card-header h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
}

.card-header h2 .material-symbols-outlined {
    font-size: 22px;
    color: var(--accent-blue);
}

/* ── Input Section ─────────────────────────────────────────── */

.input-fields {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.optional {
    font-weight: 400;
    text-transform: none;
    color: var(--text-muted);
}

.field-row {
    display: flex;
    gap: 16px;
}

.flex-1 { flex: 1; }

textarea, input[type="text"] {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-primary);
    resize: vertical;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    width: 100%;
}

textarea:focus, input[type="text"]:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

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

.field-footer {
    display: flex;
    justify-content: flex-end;
}

.char-count {
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* ── Buttons ───────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-sans);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn .material-symbols-outlined { font-size: 18px; }

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 15px;
}

.btn-success {
    background: var(--accent-green);
    color: white;
}
.btn-success:hover {
    background: #0d9668;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-outline:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 16px;
}
.btn-ghost:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

/* ── Badges ────────────────────────────────────────────────── */

.badge {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
}

.badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

.badge-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
}

/* ── Loading ───────────────────────────────────────────────── */

.loading-section { margin-top: 32px; }

.loading-card {
    text-align: center;
    padding: 48px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 0.8s linear infinite;
}

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

.loading-sub {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ── Overall Score ─────────────────────────────────────────── */

.overall-score-card {
    display: flex;
    align-items: center;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    margin-top: 32px;
    box-shadow: var(--shadow-card);
}

.overall-score-ring {
    position: relative;
    width: 100px;
    height: 100px;
    flex-shrink: 0;
}

.overall-score-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 8;
}

.score-ring-fill {
    fill: none;
    stroke: var(--accent-blue);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 327;
    stroke-dashoffset: 327;
    transition: stroke-dashoffset 1.5s ease-out, stroke 0.5s;
}

.overall-score-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 800;
}

.overall-score-info h2 {
    font-size: 20px;
    font-weight: 700;
}

.score-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Score colors */
.score-excellent .score-ring-fill { stroke: var(--accent-green); }
.score-good .score-ring-fill { stroke: var(--accent-blue); }
.score-fair .score-ring-fill { stroke: var(--accent-amber); }
.score-poor .score-ring-fill { stroke: var(--accent-red); }

.score-excellent .overall-score-value { color: var(--accent-green); }
.score-good .overall-score-value { color: var(--accent-blue); }
.score-fair .overall-score-value { color: var(--accent-amber); }
.score-poor .overall-score-value { color: var(--accent-red); }

/* ── Score Cards Grid ──────────────────────────────────────── */

.scores-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-top: 24px;
}

.score-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: border-color 0.2s, transform 0.2s;
    box-shadow: var(--shadow-card);
}

.score-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.score-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.score-card-header .material-symbols-outlined {
    font-size: 20px;
    color: var(--accent-blue);
}

.score-card-header h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.score-value-wrap {
    display: flex;
    align-items: baseline;
    gap: 2px;
    margin-bottom: 10px;
}

.score-num {
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
}

.score-max {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

.score-reasoning {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ── Mistakes ──────────────────────────────────────────────── */

.mistakes-card { margin-top: 24px; }

.mistakes-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mistake-item {
    display: flex;
    gap: 14px;
    padding: 16px;
    background: var(--bg-input);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--accent-red);
}

.mistake-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: rgba(239, 68, 68, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mistake-icon .material-symbols-outlined {
    font-size: 18px;
    color: var(--accent-red);
}

.mistake-content { flex: 1; }

.mistake-type {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent-red);
    margin-bottom: 4px;
}

.mistake-text {
    font-size: 13px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    background: rgba(239, 68, 68, 0.08);
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 6px;
}

.mistake-suggestion {
    font-size: 13px;
    color: var(--accent-green);
}

.mistake-suggestion::before {
    content: "💡 ";
}

/* ── Rewrite Comparison ────────────────────────────────────── */

.rewrite-card { margin-top: 24px; }

.token-savings {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-green);
}

.token-savings .material-symbols-outlined { font-size: 18px; }

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.comparison-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.dot-red { background: var(--accent-red); }
.dot-green { background: var(--accent-green); }

.token-badge {
    font-size: 11px;
    font-weight: 500;
    background: var(--bg-input);
    padding: 2px 8px;
    border-radius: 999px;
    color: var(--text-muted);
    margin-left: auto;
}

.comparison-text {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 300px;
    overflow-y: auto;
    color: var(--text-primary);
}

.rewrite-actions {
    display: flex;
    gap: 12px;
}

/* ── Error ─────────────────────────────────────────────────── */

.error-section { margin-top: 32px; }

.error-card {
    text-align: center;
    padding: 40px;
}

.error-card .material-symbols-outlined {
    font-size: 48px;
    color: var(--accent-red);
    margin-bottom: 12px;
}

.error-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.error-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

/* ── Toast ─────────────────────────────────────────────────── */

.toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid var(--accent-green);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    font-size: 14px;
    font-weight: 500;
    z-index: 100;
    animation: toastIn 0.3s ease-out;
}

.toast .material-symbols-outlined {
    color: var(--accent-green);
}

@keyframes toastIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ── Utilities ─────────────────────────────────────────────── */

.hidden { display: none !important; }

.results-section { animation: fadeIn 0.4s ease-out; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 900px) {
    .scores-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 680px) {
    .header { padding: 12px 16px; }
    .main-content { padding: 16px 12px 48px; }
    .scores-grid { grid-template-columns: repeat(2, 1fr); }
    .comparison-grid { grid-template-columns: 1fr; }
    .field-row { flex-direction: column; }
    .overall-score-card { flex-direction: column; text-align: center; }
    .rewrite-actions { flex-direction: column; }
}