/* Italian B Test Converter — Oxford Manuscript Design */

/* ── Fonts ─────────────────────────────────────────────────────────────────── */
/* Loaded via <link> in HTML:
   Playfair Display (display serif) — headings
   DM Mono (monospace) — accents, labels
   Source Serif 4 (text serif) — body copy
*/

/* ── Design Tokens ──────────────────────────────────────────────────────────── */
:root {
    /* Palette — Ink, Parchment, Vermillion, Sage */
    --ink-900:   #0e0b07;
    --ink-800:   #1c1713;
    --ink-700:   #2e2820;
    --ink-600:   #433c32;
    --ink-500:   #6b6254;
    --ink-400:   #958c7f;
    --ink-300:   #bdb3a8;
    --ink-200:   #ddd8d0;
    --ink-100:   #f0ebe4;
    --ink-50:    #f8f5f0;

    --parchment: #faf7f2;

    --vermillion:       #c0392b;
    --vermillion-dark:  #962d22;
    --vermillion-light: #e05c4b;
    --vermillion-muted: rgba(192, 57, 43, 0.12);

    --sage:       #4a7c59;
    --sage-dark:  #3a6146;
    --sage-light: #6a9e78;
    --sage-muted: rgba(74, 124, 89, 0.12);

    --gold:       #c9922a;
    --gold-light: #e8b84b;

    /* Semantic aliases */
    --color-bg:             var(--ink-900);
    --color-bg-secondary:   var(--ink-800);
    --color-surface:        var(--ink-700);
    --color-surface-hover:  var(--ink-600);
    --color-border:         var(--ink-600);
    --color-border-light:   var(--ink-500);
    --color-text:           var(--ink-100);
    --color-text-secondary: var(--ink-300);
    --color-text-muted:     var(--ink-400);

    --color-primary:        var(--vermillion);
    --color-primary-dark:   var(--vermillion-dark);
    --color-primary-light:  var(--vermillion-light);
    --color-success:        var(--sage);
    --color-success-dark:   var(--sage-dark);
    --color-error:          #e05c4b;
    --color-warning:        var(--gold);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--vermillion) 0%, #a52d1e 100%);
    --gradient-success: linear-gradient(135deg, var(--sage) 0%, var(--sage-dark) 100%);
    --gradient-header:  linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
    --gradient-rule:    linear-gradient(90deg, transparent, var(--gold), var(--vermillion), transparent);

    /* Surface treatment */
    --surface-bg:     rgba(30, 25, 18, 0.85);
    --surface-border: rgba(189, 179, 168, 0.12);
    --surface-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);

    /* Spacing */
    --spacing-xs:  0.25rem;
    --spacing-sm:  0.5rem;
    --spacing-md:  1rem;
    --spacing-lg:  1.5rem;
    --spacing-xl:  2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4.5rem;

    /* Border Radius — conservative, editorial */
    --radius-sm: 0.2rem;
    --radius-md: 0.4rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast:   120ms ease;
    --transition-normal: 240ms ease;
    --transition-slow:   400ms ease;

    /* Typography */
    --font-display: 'Playfair Display', 'Georgia', serif;
    --font-body:    'Source Serif 4', 'Georgia', serif;
    --font-mono:    'DM Mono', 'Courier New', monospace;

    --font-size-xs:  0.75rem;
    --font-size-sm:  0.875rem;
    --font-size-base: 1rem;
    --font-size-lg:  1.125rem;
    --font-size-xl:  1.375rem;
    --font-size-2xl: 1.875rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3.25rem;
}

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

/* ── Base ───────────────────────────────────────────────────────────────────── */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    /* Subtle paper grain texture via CSS noise */
    background-image:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23noise)' opacity='0.025'/%3E%3C/svg%3E"),
        radial-gradient(ellipse at 60% 0%, rgba(192, 57, 43, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse at 20% 100%, rgba(74, 124, 89, 0.05) 0%, transparent 50%);
}

/* ── App Shell ──────────────────────────────────────────────────────────────── */
.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 760px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-2xl);
}

/* ── Header ─────────────────────────────────────────────────────────────────── */
.header {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    text-align: center;
    position: relative;
    animation: revealDown 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* decorative rule above title */
.header::before {
    content: '';
    display: block;
    width: 80px;
    height: 1px;
    background: var(--gradient-rule);
    margin: 0 auto var(--spacing-lg);
    opacity: 0.6;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

/* Replace emoji icon with a typographic ornament */
.logo-icon {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--vermillion);
    letter-spacing: 0.15em;
    opacity: 0.85;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    font-style: italic;
    letter-spacing: -0.01em;
    line-height: 1.15;
    /* Warm off-white, not stark white */
    color: var(--ink-100);
}

/* thin rule after title */
.header::after {
    content: '';
    display: block;
    width: 200px;
    height: 1px;
    background: var(--gradient-rule);
    margin: var(--spacing-lg) auto 0;
    opacity: 0.4;
}

.subtitle {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-400);
    margin-top: var(--spacing-sm);
}

/* ── Main ───────────────────────────────────────────────────────────────────── */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* ── Cards ──────────────────────────────────────────────────────────────────── */
.card {
    background: var(--surface-bg);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-2xl);
    box-shadow: var(--surface-shadow);
    position: relative;
    animation: revealUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
    /* Left accent rule */
    border-left: 3px solid var(--vermillion);
    backdrop-filter: blur(12px);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(201, 146, 42, 0.25), transparent);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card h2 {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 700;
    font-style: italic;
    margin-bottom: var(--spacing-lg);
    color: var(--ink-100);
    letter-spacing: -0.01em;
}

/* ── Drop Zone ──────────────────────────────────────────────────────────────── */
.drop-zone {
    border: 1px dashed var(--ink-500);
    border-radius: var(--radius-md);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
}

/* Corner marks — editorial bracket feel */
.drop-zone::before,
.drop-zone::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border-color: var(--ink-500);
    border-style: solid;
    transition: border-color var(--transition-normal);
}
.drop-zone::before { top: 8px; left: 8px; border-width: 1px 0 0 1px; }
.drop-zone::after  { bottom: 8px; right: 8px; border-width: 0 1px 1px 0; }

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--vermillion-light);
    background: var(--vermillion-muted);
}
.drop-zone:hover::before,
.drop-zone.drag-over::before,
.drop-zone:hover::after,
.drop-zone.drag-over::after {
    border-color: var(--vermillion-light);
}

.drop-zone.has-file {
    border-color: var(--sage-light);
    border-style: solid;
    background: var(--sage-muted);
}
.drop-zone.has-file::before,
.drop-zone.has-file::after {
    border-color: var(--sage-light);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Replace emoji drop icon with typographic character */
.drop-icon {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-style: italic;
    color: var(--ink-500);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
    transition: color var(--transition-normal);
}
.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
    color: var(--vermillion-light);
}
.drop-zone.has-file .drop-icon {
    color: var(--sage-light);
}

.drop-text {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--ink-200);
}

.drop-subtext {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.file-types {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-500);
    margin-top: var(--spacing-sm);
}

.selected-file {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--sage-light);
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

/* ── Unit Selector ──────────────────────────────────────────────────────────── */
.unit-selector {
    margin-top: var(--spacing-lg);
}

.unit-selector label {
    display: block;
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--ink-400);
}

.unit-selector select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--ink-800);
    border: 1px solid var(--ink-600);
    border-radius: var(--radius-md);
    color: var(--ink-200);
    font-size: var(--font-size-sm);
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23958c7f' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 2.5rem;
}

.unit-selector select:hover,
.unit-selector select:focus {
    border-color: var(--vermillion);
    outline: none;
}

.help-text {
    font-size: var(--font-size-xs);
    font-family: var(--font-mono);
    color: var(--ink-500);
    margin-top: var(--spacing-xs);
}

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.8rem var(--spacing-xl);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    margin-top: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

/* Ink fill animation on hover */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.06);
    opacity: 0;
    transition: opacity var(--transition-fast);
}
.btn:hover:not(:disabled)::after {
    opacity: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 2px 12px rgba(192, 57, 43, 0.35);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 18px rgba(192, 57, 43, 0.5);
}

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

.btn-success {
    background: var(--gradient-success);
    color: #fff;
    box-shadow: 0 2px 12px rgba(74, 124, 89, 0.35);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 18px rgba(74, 124, 89, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--ink-300);
    border: 1px solid var(--ink-600);
    box-shadow: none;
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--ink-400);
    color: var(--ink-100);
    background: rgba(255, 255, 255, 0.04);
}

/* Icon inside button — no emoji, use text character or thin SVG */
.btn-icon {
    font-family: var(--font-mono);
    font-size: 1em;
    opacity: 0.8;
}

/* ── Progress Card ──────────────────────────────────────────────────────────── */
.progress-card {
    text-align: left;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: var(--ink-700);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 1.8s infinite;
}

.progress-percent {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--vermillion-light);
    min-width: 3rem;
    text-align: right;
}

.status-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.status-icon {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--vermillion);
    animation: rotateCW 1.2s linear infinite;
    display: inline-block;
    line-height: 1;
}

.status-message {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--ink-400);
    letter-spacing: 0.04em;
}

.detected-info {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-md);
}

.detected-info p {
    margin: var(--spacing-xs) 0;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--ink-400);
}

.detected-info strong {
    color: var(--ink-300);
    font-weight: 500;
}

/* ── Result Card ────────────────────────────────────────────────────────────── */
.result-card {
    text-align: left;
    border-left-color: var(--sage);
}

.result-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-icon {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.5rem;
    color: var(--sage-light);
    line-height: 1;
}

.result-details {
    padding: var(--spacing-md);
    background: rgba(74, 124, 89, 0.06);
    border: 1px solid rgba(74, 124, 89, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.result-details p {
    margin: var(--spacing-xs) 0;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--ink-400);
}

.result-details strong {
    color: var(--ink-200);
    font-weight: 500;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ── Error Card ─────────────────────────────────────────────────────────────── */
.error-card {
    text-align: left;
    border-left-color: var(--vermillion);
}

.error-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.error-icon {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.5rem;
    color: var(--vermillion-light);
    line-height: 1;
}

.error-message {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--vermillion-light);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(192, 57, 43, 0.08);
    border: 1px solid rgba(192, 57, 43, 0.2);
    border-radius: var(--radius-md);
    line-height: 1.6;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    color: var(--ink-600);
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ── Utilities ──────────────────────────────────────────────────────────────── */
.hidden {
    display: none !important;
}

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

@keyframes revealUp {
    from {
        opacity: 0;
        transform: translateY(14px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rotateCW {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

@keyframes shimmer {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes scaleIn {
    0%   { transform: scale(0.7); opacity: 0; }
    60%  { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes celebrate {
    0%   { transform: scale(0.5); opacity: 0; }
    60%  { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

/* ── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .app {
        padding: 0 var(--spacing-md) var(--spacing-xl);
    }

    .header {
        padding-top: var(--spacing-2xl);
    }

    .logo h1 {
        font-size: var(--font-size-2xl);
    }

    .card {
        padding: var(--spacing-lg);
    }

    .drop-zone {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
}