/* ==========================================================================
   Mend — Applesauce Design System (Blue/Teal personality)
   Dual theme: dark (default) + warm/light
   ========================================================================== */

/* --- Theme Variables --- */
:root, body[data-theme="dark"] {
    --bg: #111117;
    --bg-secondary: #1a1a24;
    --text: #e4e4ec;
    --text-muted: #8888a0;
    --card-bg: rgba(24, 24, 36, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --accent-soft: rgba(56, 189, 248, 0.12);
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --info: #94a3b8;
    --font-heading: 'DM Serif Display', serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Space Mono', monospace;
    --radius: 14px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --noise: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}

body[data-theme="warm"] {
    --bg: #F2F0EB;
    --bg-secondary: #E8E5DE;
    --text: #2A2118;
    --text-muted: #6B6560;
    --card-bg: rgba(255, 255, 255, 0.65);
    --card-border: rgba(0, 0, 0, 0.08);
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --accent-soft: rgba(2, 132, 199, 0.1);
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #64748b;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

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

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: var(--noise);
    background-repeat: repeat;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.5;
}

h1, h2, h3 { font-family: var(--font-heading); font-weight: 400; line-height: 1.2; }
h1 { font-size: 2rem; }
h2 { font-size: 1.35rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
.text-muted { color: var(--text-muted); font-size: 0.875rem; }
.text-success { color: var(--success); font-weight: 600; }
.text-danger { color: var(--danger); font-weight: 600; }

/* --- Layout --- */
.container { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* --- Navigation --- */
.app-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text);
    letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 12px; }

.btn-icon {
    background: none;
    border: 1px solid var(--card-border);
    color: var(--text);
    width: 38px;
    height: 38px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.1rem;
    display: grid;
    place-items: center;
    transition: background 0.2s, border-color 0.2s;
}
.btn-icon:hover { background: var(--accent-soft); border-color: var(--accent); }

/* --- Cards (glassmorphism) --- */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.4s ease both;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.25);
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent-soft); }

.btn-lg { padding: 14px 32px; font-size: 1.05rem; width: 100%; margin-top: 16px; }

/* --- Hero --- */
.hero {
    text-align: center;
    padding: 48px 0 28px;
}
.hero h1 { margin-bottom: 12px; }
.tagline { color: var(--text-muted); font-size: 1.05rem; max-width: 480px; margin: 0 auto; }

/* --- Upload Zone --- */
.upload-card { padding: 0; overflow: hidden; }
.upload-card form { padding: 24px; }

.upload-zone {
    border: 2px dashed var(--card-border);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.upload-icon { font-size: 2.5rem; margin-bottom: 12px; }

.photo-preview {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    flex-wrap: wrap;
}
.preview-thumb {
    width: 96px;
    height: 96px;
    object-fit: cover;
    border-radius: 10px;
    border: 2px solid var(--card-border);
}

.form-group { margin-top: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.9rem; font-weight: 500; }
.form-group input[type="text"] {
    width: 100%;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--card-border);
    background: var(--bg-secondary);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.95rem;
}
.form-group input[type="text"]::placeholder { color: var(--text-muted); }
.form-group input[type="text"]:focus { outline: none; border-color: var(--accent); }

/* --- Progress Steps --- */
.progress-steps { display: flex; flex-direction: column; gap: 16px; }

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--text-muted);
    opacity: 0.4;
    transition: opacity 0.4s, color 0.4s;
}
.step.active { opacity: 1; color: var(--accent); }
.step.active .step-icon { transform: scale(1.15); }
.step-icon { font-size: 1.2rem; transition: transform 0.3s; }

/* --- Result Header --- */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
}
.item-id h1 { margin-bottom: 4px; font-size: 1.6rem; }
.category { color: var(--text-muted); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; }
.confidence-badge {
    display: inline-block;
    margin-top: 8px;
    padding: 2px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--accent-soft);
    color: var(--accent);
}

/* --- Verdict Badge --- */
.verdict-badge {
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    white-space: nowrap;
    flex-shrink: 0;
}
.verdict-fix { background: rgba(52, 211, 153, 0.15); color: var(--success); border: 1px solid var(--success); }
.verdict-sell_parts { background: rgba(251, 191, 36, 0.15); color: var(--warning); border: 1px solid var(--warning); }
.verdict-replace { background: rgba(248, 113, 113, 0.15); color: var(--danger); border: 1px solid var(--danger); }
.verdict-needs_inspection { background: rgba(148, 163, 184, 0.12); color: var(--info); border: 1px solid var(--info); }

/* --- Economics Table --- */
.economics-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.economics-table th {
    text-align: left;
    padding: 8px 12px;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--card-border);
}
.economics-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--card-border);
}
.economics-table tr:last-child td { border-bottom: none; }

/* --- Expandable Panel --- */
.expandable-panel .panel-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}
.expandable-panel.expanded .panel-content { max-height: 2000px; }
.panel-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    user-select: none;
}
.toggle-icon {
    font-size: 0.85rem;
    transition: transform 0.25s;
    margin-left: auto;
}
.expandable-panel.expanded .toggle-icon { transform: rotate(90deg); }

/* --- Part Card --- */
.part-card {
    padding: 16px 0;
    border-bottom: 1px solid var(--card-border);
}
.part-card:last-child { border-bottom: none; }
.price-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
    font-size: 0.875rem;
    font-family: var(--font-mono);
}
.recommendation {
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
}

/* --- Difficulty Rating --- */
.difficulty-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
}
.wrench { opacity: 0.25; font-size: 1.2rem; }
.wrench.active { opacity: 1; }
.difficulty-rating .text-muted { margin-left: 12px; }

/* --- Warnings --- */
.warnings { margin-top: 12px; }
.warning-text { color: var(--warning); font-size: 0.9rem; margin-bottom: 6px; }

/* --- Known Issue Card --- */
.known-issue-card {
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid var(--warning);
}
.known-issue-card p { font-size: 0.9rem; }

/* --- Share Section --- */
.share-section {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* --- Footer --- */
.app-footer {
    text-align: center;
    padding: 32px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--card-border);
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.footer-links a { color: var(--text-muted); font-size: 0.875rem; }
.footer-links a:hover { color: var(--accent); }

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.card:nth-child(2) { animation-delay: 0.08s; }
.card:nth-child(3) { animation-delay: 0.16s; }
.card:nth-child(4) { animation-delay: 0.24s; }

/* --- Responsive --- */
@media (max-width: 600px) {
    .hero { padding: 32px 0 20px; }
    .hero h1 { font-size: 1.6rem; }
    .tagline { font-size: 0.95rem; }
    .result-header { flex-direction: column; }
    .verdict-badge { align-self: flex-start; }
    .economics-table { font-size: 0.82rem; }
    .economics-table th, .economics-table td { padding: 8px 6px; }
    .upload-zone { padding: 36px 16px; }
    .card { padding: 18px; }
    .app-nav { padding: 12px 16px; }
    .share-section { flex-direction: column; }
    .share-section .btn { width: 100%; }
}