/* ── Shared Styles ────────────────────────────────────────────────────
   Generic styles used across all calculators in the suite.
   Each calculator loads this first, then its own styles.css for overrides.
   ──────────────────────────────────────────────────────────────────── */

/* ── Theme Custom Properties ─────────────────────────────────────── */

:root, [data-theme="green"] {
    --color-primary: #5ba83a;
    --color-gradient-dark: #3d7f2a;
    --color-accent: #7ec462;
    --color-light-tint: #f2f9ef;
    --color-investment-tint: #eff7ec;
    --color-primary-rgb: 91, 168, 58;
    --color-dark-rgb: 61, 127, 42;
}

[data-theme="blue"] {
    --color-primary: #3b82f6;
    --color-gradient-dark: #1e5fb3;
    --color-accent: #5b9bd5;
    --color-light-tint: #f0f5ff;
    --color-investment-tint: #eef4fc;
    --color-primary-rgb: 59, 130, 246;
    --color-dark-rgb: 30, 95, 179;
}

[data-theme="purple"] {
    --color-primary: #667eea;
    --color-gradient-dark: #764ba2;
    --color-accent: #6f42c1;
    --color-light-tint: #f0f0ff;
    --color-investment-tint: #f0ecf5;
    --color-primary-rgb: 102, 126, 234;
    --color-dark-rgb: 118, 75, 162;
}

/* ── Surface / Neutral Custom Properties (light defaults) ────────── */

:root {
    --surface-bg: #ffffff;
    --surface-card: #f8f9fa;
    --surface-elevated: #ffffff;
    --surface-hover: #f0f0f0;
    --surface-subtle: #fafafa;
    --text-primary: #333333;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --text-disabled: #adb5bd;
    --border-light: #e9ecef;
    --border-medium: #dee2e6;
    --border-input: #e9ecef;
    --input-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --alert-warning-bg: #fff3cd;
    --alert-warning-text: #856404;
    --alert-success-bg: #d4edda;
    --alert-success-text: #155724;
    --alert-info-bg: #d1ecf1;
    --alert-info-text: #0c5460;
    --badge-traditional-bg: #fff3cd;
    --badge-traditional-text: #856404;
    --badge-roth-bg: #d4edda;
    --badge-roth-text: #155724;
    --badge-info-bg: #d1ecf1;
    --badge-info-text: #0c5460;
    --badge-neutral-bg: #e2e3e5;
    --badge-neutral-text: #495057;
    --badge-sell-bg: #f8d7da;
    --badge-sell-text: #721c24;
    --error-line-bg: #fff0f0;
    --chart-border-color: #ffffff;
    --velocity-fastest-bg: #f0fff4;
    --assumption-bg: #f8f9fa;
    --assumption-text: #495057;
    --limitation-bg: #fff8e1;
    --limitation-text: #5c4a00;
}

/* ── Dark Theme ────────────────────────────────────────────────────── */

[data-theme="dark"] {
    --color-primary: #569cd6;
    --color-gradient-dark: #264f78;
    --color-accent: #9cdcfe;
    --color-light-tint: #2d2d2d;
    --color-investment-tint: #2d2d2d;
    --color-primary-rgb: 86, 156, 214;
    --color-dark-rgb: 38, 79, 120;

    --surface-bg: #1e1e1e;
    --surface-card: #252526;
    --surface-elevated: #2d2d2d;
    --surface-hover: #2a2d2e;
    --surface-subtle: #252526;
    --text-primary: #cccccc;
    --text-secondary: #9d9d9d;
    --text-muted: #858585;
    --text-disabled: #5a5a5a;
    --border-light: #3c3c3c;
    --border-medium: #474747;
    --border-input: #3c3c3c;
    --input-bg: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.6);
    --alert-warning-bg: #352a05;
    --alert-warning-text: #cca700;
    --alert-success-bg: #1b3a1b;
    --alert-success-text: #6a9955;
    --alert-info-bg: #1a2e3d;
    --alert-info-text: #9cdcfe;
    --badge-traditional-bg: #352a05;
    --badge-traditional-text: #cca700;
    --badge-roth-bg: #1b3a1b;
    --badge-roth-text: #6a9955;
    --badge-info-bg: #1a2e3d;
    --badge-info-text: #9cdcfe;
    --badge-neutral-bg: #3c3c3c;
    --badge-neutral-text: #cccccc;
    --badge-sell-bg: #3d1a1a;
    --badge-sell-text: #f48771;
    --error-line-bg: #3d1a1a;
    --chart-border-color: #252526;
    --velocity-fastest-bg: #1b3a1b;
    --assumption-bg: #2d2d2d;
    --assumption-text: #9d9d9d;
    --limitation-bg: #352a05;
    --limitation-text: #cca700;
}

[data-theme="dark"] body {
    background: #1e1e1e;
}

[data-theme="dark"] .container {
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] header {
    background: #323233;
    border-bottom: 1px solid #474747;
}

[data-theme="dark"] .back-link {
    color: #9d9d9d;
}

[data-theme="dark"] .back-link:hover {
    color: #cccccc;
}

[data-theme="dark"] .theme-toggle-btn {
    background: rgba(255, 255, 255, 0.07);
    color: #cccccc;
    border-color: #474747;
}

[data-theme="dark"] .theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* ── Reset ────────────────────────────────────────────────────────── */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gradient-dark) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--surface-bg);
    border-radius: 16px;
    box-shadow: 0 20px 60px var(--shadow-color);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gradient-dark) 100%);
    color: white;
    padding: 30px;
    text-align: center;
    position: relative;
}

.header-nav {
    text-align: left;
    margin-bottom: 10px;
}

.back-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: white;
}

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.subtitle {
    opacity: 0.9;
    font-size: 1rem;
}

.content {
    display: grid;
    grid-template-columns: 450px 1fr;
    gap: 30px;
    padding: 30px;
}

.input-section, .results-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ── Cards ────────────────────────────────────────────────────────── */

.card {
    background: var(--surface-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-light);
}

.card h2 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--color-primary);
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

/* ── Forms ────────────────────────────────────────────────────────── */

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.tooltip {
    display: inline-block;
    margin-left: 5px;
    color: var(--color-primary);
    cursor: help;
    font-weight: bold;
}

input[type="number"], select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-input);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    background: var(--input-bg);
    color: var(--text-primary);
}

input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--color-primary);
}

input[type="checkbox"], input[type="radio"] {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
}

.radio-group, .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-option, .checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px;
    background: var(--surface-elevated);
    border-radius: 6px;
    transition: background 0.2s;
}

.radio-option:hover {
    background: var(--surface-hover);
}

.radio-option label {
    margin-bottom: 0;
    cursor: pointer;
    font-weight: 500;
}

/* ── Buttons ──────────────────────────────────────────────────────── */

.btn {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gradient-dark) 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    width: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(var(--color-primary-rgb), 0.4);
}

.btn:active {
    transform: translateY(0);
}

/* ── Flat Button Variant ──────────────────────────────────────────── */

.btn-flat {
    background: var(--color-primary);
    background-image: none;
}

/* ── Summary Grid ─────────────────────────────────────────────────── */

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.summary-item {
    background: var(--surface-elevated);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.summary-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.summary-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-primary);
}

.summary-value.large {
    font-size: 2rem;
}

/* ── Alerts ───────────────────────────────────────────────────────── */

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-weight: 500;
}

.alert-warning {
    background: var(--alert-warning-bg);
    color: var(--alert-warning-text);
    border-left: 4px solid #ffc107;
}

.alert-success {
    background: var(--alert-success-bg);
    color: var(--alert-success-text);
    border-left: 4px solid #28a745;
}

.alert-info {
    background: var(--alert-info-bg);
    color: var(--alert-info-text);
    border-left: 4px solid #17a2b8;
}

/* ── Charts ───────────────────────────────────────────────────────── */

.chart-container {
    position: relative;
    width: 100%;
    max-height: 400px;
}

/* ── Assumptions & Limitations ───────────────────────────────────── */

.assumptions-section {
    padding: 0 30px 30px;
}

.assumptions-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

@media (max-width: 768px) {
    .assumptions-list {
        grid-template-columns: 1fr;
    }
}

.assumption-item {
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.9rem;
    line-height: 1.5;
    border-left: 3px solid;
}

.assumption-assumption {
    background: var(--assumption-bg);
    border-left-color: var(--text-disabled);
    color: var(--assumption-text);
}

.assumption-limitation {
    background: var(--limitation-bg);
    border-left-color: #ffc107;
    color: var(--limitation-text);
}

/* ── Footer ───────────────────────────────────────────────────────── */

footer {
    text-align: center;
    padding: 20px;
    background: var(--surface-card);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ── Theme Toggle Button & Popover ───────────────────────────────── */

.theme-toggle-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    letter-spacing: 0.3px;
}

.theme-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.theme-popover {
    position: absolute;
    top: 36px;
    right: 12px;
    background: var(--surface-bg);
    border: 1px solid var(--border-light);
    border-radius: 10px;
    box-shadow: 0 8px 24px var(--shadow-color);
    z-index: 1000;
    min-width: 140px;
    overflow: hidden;
    display: none;
}

.theme-popover.open {
    display: block;
}

.theme-popover-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.15s;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.theme-popover-item:hover {
    background: var(--surface-hover);
}

.theme-popover-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid transparent;
}

.theme-popover-item[data-theme="green"] .theme-popover-dot { background: #5ba83a; }
.theme-popover-item[data-theme="blue"] .theme-popover-dot { background: #3b82f6; }
.theme-popover-item[data-theme="purple"] .theme-popover-dot { background: #667eea; }
.theme-popover-item[data-theme="dark"] .theme-popover-dot { background: #569cd6; border-color: #858585; }

.theme-popover-check {
    margin-left: auto;
    font-size: 0.85rem;
    opacity: 0;
}

.theme-popover-item.active .theme-popover-check {
    opacity: 1;
}

/* ── Responsive ───────────────────────────────────────────────────── */

@media (max-width: 1024px) {
    .content {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
}

@media print {
    body {
        background: var(--surface-bg);
    }

    .btn {
        display: none;
    }
}