/* ══════════════════════════════════════════════
   Design System: The Architectural Horizon
   Shared theme for all Financial Tools
   ══════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
    /* Primary — Deep Navy (Stability) */
    --primary: #19355c;
    --primary-container: #324c75;
    --on-primary: #ffffff;
    --on-primary-container: #ffffff;
    --primary-10: rgba(25, 53, 92, 0.10);
    --primary-06: rgba(25, 53, 92, 0.06);
    --primary-03: rgba(25, 53, 92, 0.03);

    /* Secondary — Growth Green */
    --secondary: #1a7d45;
    --secondary-container: #b8e6c8;
    --on-secondary: #ffffff;

    /* Tertiary */
    --tertiary: #6b5778;
    --tertiary-container: #f2daff;

    /* Error */
    --error: #ba1a1a;
    --error-container: #ffdad6;

    /* Warning */
    --warning: #7d6000;
    --warning-container: #ffe08a;

    /* Surface Hierarchy (Nested Depth) */
    --surface: #f7f9fb;
    --surface-container-low: #f2f4f6;
    --surface-container: #eceef0;
    --surface-container-high: #e6e8ea;
    --surface-container-highest: #e0e2e4;
    --surface-container-lowest: #ffffff;

    /* On Surface */
    --on-surface: #191c1e;
    --on-surface-variant: #42474e;

    /* Outline */
    --outline: #72777f;
    --outline-variant: #c3c6d4;
    --ghost-border: rgba(195, 198, 212, 0.15);

    /* Elevation — Ambient Shadows */
    --shadow-ambient: 0 20px 40px rgba(25, 28, 30, 0.06);
    --shadow-sm: 0 2px 8px rgba(25, 28, 30, 0.04);
    --shadow-md: 0 8px 24px rgba(25, 28, 30, 0.08);

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.625rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;

    /* Typography */
    --font-display: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Public Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ── Dark Mode Tokens ── */
[data-theme="dark"] {
    --primary: #8eafd4;
    --primary-container: #2b4a6e;
    --on-primary: #0a1929;
    --on-primary-container: #e2e3e7;
    --primary-10: rgba(142, 175, 212, 0.12);
    --primary-06: rgba(142, 175, 212, 0.06);
    --primary-03: rgba(142, 175, 212, 0.03);

    --secondary: #6dd897;
    --secondary-container: #1a4d2e;
    --on-secondary: #0a1929;

    --tertiary: #cbb0d9;
    --tertiary-container: #4a3856;

    --error: #ffb4ab;
    --error-container: #690005;

    --warning: #f0c94a;
    --warning-container: #4d3c00;

    --surface: #111418;
    --surface-container-low: #191c20;
    --surface-container: #1e2126;
    --surface-container-high: #272a2f;
    --surface-container-highest: #313539;
    --surface-container-lowest: #0c0e12;

    --on-surface: #e2e3e7;
    --on-surface-variant: #c1c5cd;

    --outline: #8b9099;
    --outline-variant: #42474e;
    --ghost-border: rgba(66, 71, 78, 0.3);

    --shadow-ambient: 0 20px 40px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: var(--font-body);
    background: var(--surface);
    color: var(--on-surface);
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Header — Signature gradient ── */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
    color: var(--on-primary);
    padding: 26px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.header-left h1 {
    font-family: var(--font-display);
    font-size: 1.625rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}
.header-left p {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    opacity: 0.6;
    margin-top: 3px;
    font-weight: 400;
}

[data-theme="dark"] .header {
    background: linear-gradient(135deg, #0f1f33 0%, #1a3352 100%);
    color: #ffffff;
}
[data-theme="dark"] .header h1,
[data-theme="dark"] .header p {
    color: #ffffff;
}

/* ── Theme Toggle ── */
.theme-toggle {
    background: rgba(255,255,255,0.12);
    border: 1.5px solid rgba(255,255,255,0.2);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.theme-toggle:hover { background: rgba(255,255,255,0.2); }

/* ── Fields — No box borders, bottom-weighted focus ── */
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.field-wrap {
    position: relative; display: flex; align-items: center;
}
.field-wrap .pre {
    position: absolute; left: 14px; color: var(--outline);
    font-size: 0.9375rem; font-weight: 600; pointer-events: none;
    z-index: 1;
}
.field-wrap .suf {
    position: absolute; right: 14px; color: var(--outline);
    font-size: 0.9375rem; font-weight: 600; pointer-events: none;
    z-index: 1;
}
.field input[type="number"],
.field input[type="date"],
.field input[type="text"],
.field select {
    width: 100%;
    border: none;
    border-bottom: 2px solid transparent;
    border-radius: var(--radius-md) var(--radius-md) 2px 2px;
    padding: 12px 14px;
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--on-surface);
    background: var(--surface-container-high);
    transition: border-color 0.25s, background-color 0.25s, box-shadow 0.25s;
}
.field input:focus, .field select:focus {
    outline: none;
    border-bottom-color: var(--primary);
    background: var(--surface-container-lowest);
    box-shadow: 0 1px 0 0 var(--primary);
}
.field.has-pre input { padding-left: 30px; }
.field.has-suf input { padding-right: 38px; }

[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="date"],
[data-theme="dark"] select {
    background: var(--surface-container);
    color: var(--on-surface);
    border-color: var(--outline-variant);
}
[data-theme="dark"] input:focus {
    border-color: var(--primary) !important;
}

/* ── Summary Cards — Tonal layering ── */
.summary-section { padding: 28px 40px 0; max-width: 1400px; margin: 0 auto; }
.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.card {
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    padding: 22px 26px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.25s;
    position: relative;
    overflow: hidden;
    border: none;
}
.card:hover { box-shadow: var(--shadow-md); }
.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-container));
    opacity: 0.35;
}
.card.green::before  { background: linear-gradient(90deg, var(--secondary), var(--secondary-container)); opacity: 0.7; }
.card.red::before    { background: var(--error); opacity: 0.6; }
.card.amber::before  { background: linear-gradient(90deg, var(--warning), var(--warning-container)); opacity: 0.7; }
.card.purple::before { background: var(--tertiary); opacity: 0.6; }

.card.featured {
    background: var(--primary-container);
    box-shadow: var(--shadow-md);
}
.card.featured::before {
    background: linear-gradient(90deg, var(--primary), var(--tertiary));
    opacity: 0.9;
    height: 4px;
}
.card.featured .card-label { color: var(--on-primary-container); opacity: 0.8; }
.card.featured .card-value { color: var(--on-primary-container); }
.card.featured .card-sub   { color: var(--on-primary-container); opacity: 0.75; }
[data-theme="dark"] .card.featured { background: color-mix(in srgb, var(--primary) 18%, var(--surface-container-low)); }
[data-theme="dark"] .card { background: var(--surface-container-low); }

.card-label {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}
.card-value {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
}
.card-sub {
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--on-surface-variant);
    margin-top: 8px;
    font-weight: 500;
}

/* ── Tabs ── */
.main-content { padding: 28px 40px 48px; max-width: 1400px; margin: 0 auto; }

.tabs-container {
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.tabs-header {
    display: flex;
    background: var(--surface-container-low);
}
.tab-btn {
    padding: 16px 28px;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    background: transparent;
    border: none;
    cursor: pointer;
    border-bottom: 2.5px solid transparent;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: var(--surface-container-lowest);
}
.tab-btn:hover:not(.active) { color: var(--on-surface); }

.tab-content { display: none; }
.tab-content.active { display: block; }

[data-theme="dark"] .tabs-header { background: var(--surface-container-low); }
[data-theme="dark"] .tab-btn.active { color: var(--primary); }

/* ── Modal — Glassmorphism overlay ── */
.modal-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(25, 28, 30, 0.35);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal {
    background: var(--surface-container-lowest);
    border-radius: var(--radius-2xl);
    padding: 32px 36px;
    max-width: 640px;
    width: 92%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-ambient), var(--shadow-md);
}
.modal-head {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px;
}
.modal-head h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--on-surface);
}
.modal-close {
    background: var(--surface-container-high);
    border: none;
    width: 32px; height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    display: flex; align-items: center; justify-content: center;
    color: var(--on-surface-variant);
    transition: background 0.15s;
}
.modal-close:hover { background: var(--surface-container-highest); }

.modal-section { margin-bottom: 28px; }
.modal-section h3 {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 16px;
    padding: 10px 0;
    background: linear-gradient(90deg, var(--surface-container-low), transparent 80%);
    margin-left: -36px; margin-right: -36px;
    padding-left: 36px;
}
.modal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.modal-grid.three-col { grid-template-columns: 1fr 1fr 1fr; }

[data-theme="dark"] .modal { background: var(--surface-container); }
[data-theme="dark"] .modal-overlay { background: rgba(0,0,0,0.6); }

/* ── Primary Button — Signature gradient ── */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-container));
    color: var(--on-primary);
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(25, 53, 92, 0.2);
}
.btn-primary:hover { opacity: 0.92; box-shadow: 0 6px 16px rgba(25, 53, 92, 0.3); }

.modal-save {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--primary-container));
    color: var(--on-primary);
    border: none;
    padding: 14px;
    border-radius: var(--radius-lg);
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 700;
    cursor: pointer;
    margin-top: 8px;
    transition: opacity 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(25, 53, 92, 0.2);
}
.modal-save:hover { opacity: 0.92; box-shadow: 0 6px 16px rgba(25, 53, 92, 0.3); }

/* ── Help Link ── */
.help-link {
    color: rgba(255,255,255,0.6);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s;
}
.help-link:hover { color: rgba(255,255,255,0.9); text-decoration: underline; }

[data-theme="dark"] .help-link { color: rgba(255,255,255,0.65); }
[data-theme="dark"] .help-link:hover { color: rgba(255,255,255,0.9); }

/* ── Help Modal Content ── */
.help-section { margin-bottom: 24px; }
.help-section:last-child { margin-bottom: 0; }
.help-section h3 {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    margin-left: 0; margin-right: 0;
    padding-left: 0;
    text-transform: none;
    letter-spacing: normal;
}
.help-section h3 .help-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}
.help-section p, .help-section li {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--on-surface-variant);
    line-height: 1.65;
}
.help-section ul {
    padding-left: 20px;
    margin-top: 6px;
}
.help-section li { margin-bottom: 4px; }
.help-section li strong {
    color: var(--on-surface);
    font-weight: 600;
}
.help-divider {
    border: none;
    height: 1px;
    background: var(--surface-container-high);
    margin: 20px 0;
}
.help-tip {
    background: var(--primary-06);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--on-surface-variant);
    line-height: 1.6;
}
.help-tip strong { color: var(--primary); }

/* ── Utility ── */
.pos { color: var(--secondary); }
.neg { color: var(--error); }

/* ── Responsive ── */
@media (max-width: 900px) {
    .summary-grid { grid-template-columns: repeat(2, 1fr); }
    .header { padding: 22px 24px; }
    .summary-section { padding: 20px 24px 0; }
    .main-content { padding: 20px 24px 40px; }
}

@media (max-width: 520px) {
    .summary-grid { grid-template-columns: 1fr; }

    .header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
        padding: 16px 16px;
    }
    .header-left h1 { font-size: 1.25rem; }
    .header-left p { font-size: 0.75rem; }
    .theme-toggle { width: 34px; height: 34px; font-size: 1rem; }

    .summary-section { padding: 16px 16px 0; }
    .summary-grid { gap: 12px; }
    .card { padding: 16px 18px; }
    .card .value { font-size: 1.5rem; }

    .main-content { padding: 16px 16px 32px; }
    .tabs-header button { padding: 12px 14px; font-size: 0.75rem; }

    .modal { padding: 20px 18px; width: 96%; border-radius: var(--radius-lg); }
    .modal-head h2 { font-size: 1.125rem; }
    .modal-grid, .modal-grid.three-col { grid-template-columns: 1fr; }
}