/* SPZ Reader — TechTools dark theme, mobile-first */
:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #141419;
    --card-bg: #1a1a24;
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --ok: #22c55e;
    --warn: #f59e0b;
    --err: #ef4444;
    --plate-blue: #003399;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --transition-base: 0.3s ease;
    --tt-topnav-h: 64px; /* seeded; tt-navbar.js publishes the exact value */
}

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

/* The hidden attribute must ALWAYS win — classes below set display:flex, which
   would otherwise silently defeat [hidden] (the computed-display gotcha). */
[hidden] { display: none !important; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: clip; /* never overflow-x:hidden — it breaks position:sticky */
}

.app { max-width: 860px; margin: 0 auto; padding: var(--spacing-md); }

/* ============ hero ============ */
.hero { text-align: center; padding: var(--spacing-lg) var(--spacing-sm) var(--spacing-md); }
.hero h1 {
    font-size: 1.75rem; font-weight: 800; letter-spacing: -0.02em;
    display: flex; align-items: center; justify-content: center; gap: 0.6rem;
}
.hero h1 i { color: var(--accent-primary); }
.hero-sub { color: var(--text-secondary); max-width: 46rem; margin: 0.6rem auto 0; font-size: 0.95rem; line-height: 1.55; }

/* ============ cards / states ============ */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* ---- upload ---- */
.dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.22);
    border-radius: var(--radius-lg);
    padding: 2.2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-base), background var(--transition-base);
}
.dropzone:hover, .dropzone:focus-visible, .dropzone.is-over {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.07);
    outline: none;
}
.dz-icon { font-size: 2.2rem; color: var(--accent-primary); margin-bottom: 0.7rem; }
.dz-line { font-size: 1.05rem; font-weight: 600; }
.dz-browse { color: var(--accent-primary); text-decoration: underline; }
.dz-hint { color: var(--text-muted); font-size: 0.82rem; margin-top: 0.5rem; }

.picked { margin-top: var(--spacing-lg); text-align: center; }
.picked-img {
    max-width: 100%; max-height: 320px;
    border-radius: var(--radius-md); border: 1px solid var(--border-color);
}
.picked-meta { margin: 0.6rem 0 1rem; color: var(--text-secondary); font-size: 0.85rem; display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.picked-name { max-width: 60vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.picked-actions { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; }
.upload-error { color: var(--err); margin-top: var(--spacing-md); font-size: 0.9rem; }

/* ---- buttons (≥44px targets) ---- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    min-height: 44px; padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--secondary-bg);
    color: var(--text-primary);
    font: inherit; font-weight: 600; font-size: 0.95rem;
    cursor: pointer;
    transition: filter var(--transition-base), transform 0.1s ease;
}
.btn:hover { filter: brightness(1.2); }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent-gradient); border-color: transparent; }
.btn-lg { padding: 0.8rem 1.6rem; font-size: 1rem; }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ---- working ---- */
#stateWork { text-align: center; }
.work-visual { position: relative; display: inline-block; max-width: 100%; margin-bottom: var(--spacing-md); }
.work-thumb {
    max-width: 100%; max-height: 260px;
    border-radius: var(--radius-md); border: 1px solid var(--border-color);
    filter: saturate(0.85) brightness(0.9);
}
.work-scan {
    position: absolute; left: 0; right: 0; height: 3px; top: 0;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
    animation: scan 2.4s ease-in-out infinite;
    border-radius: 2px;
}
@keyframes scan { 0%, 100% { top: 4%; } 50% { top: 92%; } }
.work-status { font-size: 1.05rem; font-weight: 600; display: flex; gap: 0.5rem; justify-content: center; align-items: center; }
.work-status i { color: var(--accent-primary); }
.work-elapsed { color: var(--text-secondary); margin-top: 0.4rem; font-variant-numeric: tabular-nums; }
.work-note { color: var(--text-muted); font-size: 0.85rem; max-width: 34rem; margin: 0.8rem auto 1rem; line-height: 1.5; }

/* ---- result ---- */
.result-title { font-size: 1.15rem; margin-bottom: var(--spacing-lg); display: flex; align-items: center; gap: 0.5rem; }
.result-title i { color: var(--ok); }
.result-grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-lg); }
.result-label {
    display: block; color: var(--text-muted); font-size: 0.78rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.55rem;
}

/* EU-style plate */
.plate {
    display: inline-flex; align-items: stretch;
    background: #f5f6f7; border: 3px solid #16181d; border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
    max-width: 100%;
}
.plate-band {
    background: var(--plate-blue); color: #fff;
    display: flex; align-items: flex-end; justify-content: center;
    font-size: 0.7rem; font-weight: 700; padding: 0.3rem 0.45rem;
    letter-spacing: 0.03em;
}
.plate-text {
    color: #101216;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-weight: 700; font-size: clamp(1.5rem, 7vw, 2.3rem);
    letter-spacing: 0.08em;
    padding: 0.35rem 0.9rem 0.3rem;
    white-space: nowrap;
}
.plate-warn { color: var(--warn); font-size: 0.85rem; margin-top: 0.6rem; display: flex; gap: 0.45rem; align-items: baseline; }

.result-meta { color: var(--text-muted); font-size: 0.78rem; margin-top: var(--spacing-lg); }
.result-actions { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-md); flex-wrap: wrap; }

/* ---- error ---- */
.state-error { border-color: rgba(239, 68, 68, 0.4); text-align: center; }
.error-line { color: var(--err); font-weight: 600; margin-bottom: var(--spacing-md); display: flex; gap: 0.5rem; justify-content: center; align-items: baseline; }

/* ============ facts ============ */
.facts { display: grid; grid-template-columns: 1fr; gap: var(--spacing-md); margin-bottom: var(--spacing-xl); }
.fact {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}
.fact i { color: var(--accent-primary); font-size: 1.3rem; margin-bottom: 0.6rem; }
.fact h3 { font-size: 0.95rem; margin-bottom: 0.35rem; }
.fact p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.5; }

/* ============ toasts ============ */
.toasts { position: fixed; bottom: 1rem; right: 1rem; z-index: calc(var(--tt-z-toast, 1100) + 10); display: flex; flex-direction: column; gap: 0.5rem; }
.toast {
    background: var(--card-bg); border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 0.7rem 1rem; font-size: 0.9rem;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
    animation: toast-in 0.25s ease;
}
.toast.ok { border-left-color: var(--ok); }
.toast.err { border-left-color: var(--err); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ============ desktop ============ */
@media (min-width: 768px) {
    .app { padding: var(--spacing-xl); }
    .hero h1 { font-size: 2.2rem; }
    .result-grid { grid-template-columns: auto 1fr; gap: var(--spacing-xl); align-items: start; }
    .facts { grid-template-columns: repeat(3, 1fr); }
}

/* Disable heavy animation on small devices */
@media (max-width: 768px) {
    .work-scan { animation-duration: 3.2s; }
}

/* ============ dropzone action buttons ============ */
.dz-actions { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; margin-top: var(--spacing-lg); }

/* ============ public API section ============ */
.api-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}
.api-title { font-size: 1.15rem; display: flex; align-items: center; gap: 0.5rem; margin-bottom: var(--spacing-md); }
.api-title i { color: var(--accent-primary); }
.api-intro { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.55; margin-bottom: var(--spacing-lg); }

.api-key-panel {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}
.key-line { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: var(--spacing-md); }
.key-line:last-child { margin-bottom: 0; }
.key-box {
    display: flex; align-items: center; gap: var(--spacing-md); flex-wrap: wrap;
    background: rgba(99, 102, 241, 0.08);
    border: 1px dashed var(--accent-primary);
    border-radius: var(--radius-md);
    padding: 0.7rem 1rem; margin-bottom: var(--spacing-md);
}
.key-value {
    font-family: 'JetBrains Mono', monospace; font-size: 0.85rem;
    word-break: break-all; flex: 1; min-width: 200px;
}
.key-meta { color: var(--text-muted); font-size: 0.82rem; margin-bottom: var(--spacing-md); }
.key-meta b { color: var(--text-primary); }
.key-warn { color: var(--warn); font-size: 0.82rem; margin-bottom: var(--spacing-md); }

.api-docs h4 { margin: var(--spacing-lg) 0 var(--spacing-sm); font-size: 0.92rem; display: flex; align-items: center; gap: 0.5rem; }
.api-step {
    display: inline-flex; align-items: center; justify-content: center;
    width: 22px; height: 22px; border-radius: 50%; flex: none;
    background: var(--accent-gradient); font-size: 0.75rem; font-weight: 700;
}
.api-async, .api-note { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.5; }
.api-note code, .api-errors code {
    background: var(--secondary-bg); border: 1px solid var(--border-color);
    border-radius: 4px; padding: 0.1rem 0.35rem;
    font-family: 'JetBrains Mono', monospace; font-size: 0.78rem;
}
.api-code {
    background: #0d0d14; border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    overflow-x: auto;
}
.api-code code { font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; line-height: 1.55; color: #c9d1e3; white-space: pre; }
.api-errors { list-style: none; }
.api-errors li { color: var(--text-secondary); font-size: 0.88rem; padding: 0.2rem 0; }

/* Phones are camera-first: promote "Take a photo" to the primary action and
   put it first; the file-picker button steps back. (Desktop keeps upload-first.) */
@media (pointer: coarse) {
    #btnCamera { order: -1; background: var(--accent-gradient); border-color: transparent; }
    #btnBrowse { background: var(--secondary-bg); border-color: var(--border-color); }
}

/* scrollIntoView targets clear the sticky navbar */
.state, .picked { scroll-margin-top: calc(var(--tt-topnav-h, 64px) + 12px); }

/* OCR progress bar (working state) */
.work-track {
    width: min(420px, 90%); height: 8px; margin: 0.8rem auto 0;
    background: var(--secondary-bg); border: 1px solid var(--border-color);
    border-radius: 999px; overflow: hidden;
}
.work-bar {
    height: 100%; width: 0;
    background: var(--accent-gradient);
    border-radius: 999px;
    transition: width 0.25s ease;
}