/* ==========================================================================
   AlphaCorr — CimPACK File Converter Portal
   Hand-written CSS, no frameworks.
   ========================================================================== */

:root {
    /* Brand */
    --brand:        #1e40af;
    --brand-light:  #3b82f6;
    --brand-bg:     #eff6ff;

    /* Grays */
    --gray-900: #111827;
    --gray-700: #374151;
    --gray-500: #6b7280;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50:  #f9fafb;
    --white:    #ffffff;

    /* Status */
    --success:  #16a34a;
    --success-bg: #f0fdf4;
    --danger:   #dc2626;
    --danger-bg: #fef2f2;
    --warning:  #d97706;

    /* Layout */
    --container-max: 1100px;
    --radius: 6px;
    --radius-lg: 10px;
}

/* ---------- Reset & base ---------- */

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

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gray-50);
}

a { color: var(--brand); }
a:hover { color: var(--brand-light); }

h1, h2, h3, h4 {
    color: var(--gray-900);
    line-height: 1.3;
}

img { max-width: 100%; }

/* ---------- Nav ---------- */

.nav {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 0 24px;
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 56px;
    gap: 24px;
}

.nav-brand {
    text-decoration: none;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.nav-brand-name {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--brand);
}

.nav-brand-tag {
    font-size: 0.8rem;
    color: var(--gray-500);
    font-weight: 400;
}

.nav-links {
    display: flex;
    gap: 20px;
    margin-left: auto;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-size: 0.925rem;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--brand);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: 16px;
}

.nav-username {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ---------- Container ---------- */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 32px 24px;
}

/* ---------- Buttons ---------- */

.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 0.925rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background 0.15s, border-color 0.15s;
    line-height: 1.4;
}

.btn-primary {
    background: var(--brand);
    color: var(--white);
    border-color: var(--brand);
}

.btn-primary:hover {
    background: var(--brand-light);
    border-color: var(--brand-light);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--brand);
    border-color: var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--brand);
    background: var(--brand-bg);
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.825rem;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ---------- Cards ---------- */

.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.card h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
}

.card p {
    margin: 0;
    color: var(--gray-500);
    font-size: 0.925rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

/* ---------- Hero (landing) ---------- */

.hero {
    text-align: center;
    padding: 48px 0 40px;
    max-width: 720px;
    margin: 0 auto;
}

.hero-free {
    font-size: 3rem;
    font-weight: 800;
    color: var(--brand);
    margin: 0 0 4px;
    letter-spacing: -0.03em;
}

.hero h1 {
    font-size: 2.25rem;
    margin: 0 0 16px;
    letter-spacing: -0.02em;
    color: var(--gray-500);
    font-weight: 400;
}

.hero-sub {
    font-size: 1.1rem;
    color: var(--gray-700);
    margin: 0 0 28px;
    line-height: 1.7;
}

.hero-context {
    max-width: 720px;
    margin: -16px auto 32px;
    text-align: center;
}

.hero-context p {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ---------- Why section ---------- */

.why-section {
    max-width: 680px;
    margin: 0 auto 32px;
    text-align: center;
    padding: 32px 24px;
}

.why-section h2 {
    margin: 0 0 12px;
    font-size: 1.35rem;
}

.why-section p {
    margin: 0;
    font-size: 1.05rem;
    color: var(--gray-700);
    line-height: 1.8;
}

/* ---------- Features section ---------- */

.features {
    padding: 24px 0 40px;
}

/* ---------- Early access ---------- */

.early-access {
    background: var(--brand-bg);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-lg);
    padding: 32px 36px;
    margin: 8px 0 32px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.early-access h2 {
    margin: 0 0 12px;
    font-size: 1.25rem;
}

.free-headline {
    font-size: 1.75rem !important;
    letter-spacing: -0.02em;
}

.free-catch {
    font-weight: 400;
    color: var(--gray-500);
    font-size: 1.25rem;
}

.early-access p {
    margin: 0 0 12px;
    font-size: 0.925rem;
    color: var(--gray-700);
    line-height: 1.7;
}

.early-access p:last-child {
    margin-bottom: 0;
}

.early-access-note {
    font-size: 0.85rem !important;
    color: var(--gray-500) !important;
    font-style: italic;
}

/* ---------- How it works ---------- */

.how-it-works {
    padding: 40px 0;
}

.how-it-works h2 {
    text-align: center;
    margin: 0 0 28px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    text-align: center;
}

.step {
    padding: 20px;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--brand);
    color: var(--white);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.step h4 {
    margin: 0 0 6px;
}

.step p {
    margin: 0;
    color: var(--gray-500);
    font-size: 0.925rem;
}

/* ---------- CTA bottom ---------- */

.cta-bottom {
    text-align: center;
    padding: 48px 24px;
    margin: 24px 0 0;
    background: var(--brand-bg);
    border-radius: var(--radius-lg);
}

.cta-bottom h2 {
    margin: 0 0 8px;
}

.cta-bottom p {
    color: var(--gray-500);
    margin: 0 0 24px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Page header ---------- */

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h1 {
    margin: 0;
}

/* ---------- Data table ---------- */

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 10px 14px;
    text-align: left;
    font-size: 0.9rem;
}

.data-table thead {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.data-table th {
    font-weight: 600;
    color: var(--gray-900);
}

.data-table tbody tr {
    border-bottom: 1px solid var(--gray-100);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

/* ---------- Badges ---------- */

.badge {
    display: inline-block;
    padding: 2px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 12px;
    text-transform: capitalize;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-failed {
    background: var(--danger-bg);
    color: var(--danger);
}

.badge-pending {
    background: var(--gray-100);
    color: var(--gray-500);
}

/* ---------- Empty state ---------- */

.empty-state {
    text-align: center;
    padding: 64px 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.empty-state h2 {
    margin: 0 0 8px;
    color: var(--gray-700);
}

.empty-state p {
    color: var(--gray-500);
    margin: 0 0 20px;
}

/* ---------- Forms ---------- */

.form-page {
    display: flex;
    justify-content: center;
    padding: 16px 0;
}

.form-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 520px;
}

.form-card h1 {
    margin: 0 0 4px;
    font-size: 1.5rem;
}

.form-subtitle {
    color: var(--gray-500);
    margin: 0 0 24px;
    font-size: 0.925rem;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-900);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"],
.form-group select {
    width: 100%;
    padding: 9px 12px;
    font-size: 0.925rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-900);
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--brand-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-group input[type="file"] {
    font-size: 0.9rem;
    color: var(--gray-700);
}

.form-hint {
    display: block;
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--gray-500);
}

.form-check label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-weight: 400;
    font-size: 0.9rem;
    cursor: pointer;
}

.form-check input[type="checkbox"] {
    margin-top: 4px;
}

.form-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--gray-500);
}

.required {
    color: var(--danger);
}

/* ---------- Alerts ---------- */

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.alert ul {
    margin: 0;
    padding-left: 18px;
}

.alert-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid #bbf7d0;
}

/* ---------- Footer ---------- */

.footer {
    border-top: 1px solid var(--gray-200);
    padding: 24px 24px 20px;
    margin-top: auto;
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}

.footer-contact {
    margin: 0 0 4px;
    font-size: 0.85rem;
    color: var(--gray-700);
}

.footer-copy {
    margin: 10px 0 0;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* ---------- Preview ---------- */

.preview-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
    border-bottom: 2px solid var(--gray-200);
}

.preview-tab {
    padding: 10px 24px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
}

.preview-tab.active {
    color: var(--brand);
    border-bottom-color: var(--brand);
}

.preview-tab:hover {
    color: var(--brand-light);
}

.preview-panel {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    min-height: 400px;
}

.svg-container {
    padding: 24px;
    text-align: center;
    overflow: auto;
}

.svg-container img {
    max-width: 100%;
    max-height: 600px;
    height: auto;
}

#three-canvas {
    width: 100%;
    height: 600px;
}

.viewer-controls {
    text-align: center;
    padding: 8px;
    border-top: 1px solid var(--gray-100);
}

.preview-legend {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding: 16px;
    font-size: 0.85rem;
    color: var(--gray-700);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-swatch {
    display: inline-block;
    width: 20px;
    height: 3px;
    border-radius: 1px;
}

/* ---------- Balance box ---------- */

.balance-box {
    display: flex;
    gap: 20px;
    justify-content: center;
    padding: 12px 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.balance-box strong {
    color: var(--gray-900);
}

/* ---------- Tip ---------- */

.tip {
    margin-top: 16px;
    padding: 12px 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--gray-700);
    line-height: 1.6;
}

/* ---------- Disclaimer ---------- */

.disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--gray-500);
    margin: 48px auto 0;
    max-width: 600px;
    line-height: 1.6;
}

/* ---------- Utilities ---------- */

.text-muted {
    color: var(--gray-500);
    font-size: 0.85rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
    .nav-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
        gap: 8px;
    }

    .nav-links {
        order: 3;
        width: 100%;
        margin-left: 0;
        gap: 16px;
    }

    .nav-user {
        margin-left: auto;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .form-card {
        padding: 24px;
    }

    .data-table {
        font-size: 0.825rem;
    }

    .data-table th,
    .data-table td {
        padding: 8px 10px;
    }
}