/* ============================================
   1040ES Calculator — Design System
   Dark mode, glassmorphism, Inter font
   ============================================ */

:root {
    /* Color palette */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(30, 41, 59, 0.8);
    --bg-input: rgba(15, 23, 42, 0.6);
    --bg-input-focus: rgba(15, 23, 42, 0.8);
    --border-card: rgba(99, 102, 241, 0.15);
    --border-card-hover: rgba(99, 102, 241, 0.35);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;

    --accent: #818cf8;
    --accent-bright: #a5b4fc;
    --accent-glow: rgba(99, 102, 241, 0.25);

    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.1);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.1);

    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
    --gradient-surface: linear-gradient(145deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);

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

    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border-card);
    --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--border-card-hover);
    --shadow-glow: 0 0 30px var(--accent-glow);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

:root.light-theme {
    /* Color palette - Light Mode (Slate standard) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --bg-input: rgba(255, 255, 255, 0.5);
    --bg-input-focus: rgba(255, 255, 255, 0.9);
    --border-card: rgba(99, 102, 241, 0.2);
    --border-card-hover: rgba(99, 102, 241, 0.4);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-dim: #64748b;

    --gradient-surface: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(241, 245, 249, 1) 100%);
    
    --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.05), 0 0 0 1px var(--border-card);
    --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--border-card-hover);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Subtle animated background grid */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   Layout
   ============================================ */

.app-container {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

/* ============================================
   Header
   ============================================ */

.app-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    position: relative;
}

.header-actions {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    gap: var(--space-sm);
    z-index: 50;
}

.action-link {
    color: var(--text-secondary);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    background: transparent;
    border: 1px solid transparent;
    cursor: pointer;
}

.action-link:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
    background: var(--bg-card);
    border-color: var(--border-card);
}

.header-glow {
    position: absolute;
    top: -60px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 200px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
    animation: pulse-glow 4s ease-in-out infinite alternate;
}

@keyframes pulse-glow {
    from { opacity: 0.5; transform: translateX(-50%) scale(0.95); }
    to   { opacity: 1;   transform: translateX(-50%) scale(1.05); }
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.app-header .accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
    margin-top: var(--space-xs);
}

.disclaimer-banner {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(248, 113, 113, 0.3);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: var(--space-md);
    display: inline-block;
    line-height: 1.4;
}

/* ============================================
   Cards / Glass Panels
   ============================================ */

.card {
    background: var(--gradient-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    overflow: visible;
    transition:
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.card:hover {
    border-color: var(--border-card-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.card-icon {
    font-size: 1.2rem;
}

/* ============================================
   Form Grid
   ============================================ */

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.card-full {
    grid-column: 1 / -1;
}

@media (max-width: 700px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Form Fields
   ============================================ */

.field {
    margin-bottom: var(--space-md);
}

.field:last-child {
    margin-bottom: 0;
}

.field-row {
    display: flex;
    gap: var(--space-md);
}

.field-row .field {
    flex: 1;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

input[type="number"],
select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: var(--bg-input);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 400;
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        background var(--transition-fast);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
}

input[type="number"]:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--bg-input-focus);
}

select option {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

input[type="number"]::placeholder {
    color: var(--text-dim);
}

/* Remove number input spinners */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type="number"] {
    -moz-appearance: textfield;
}

/* Dollar prefix */
.input-prefix {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix span {
    position: absolute;
    left: 0.75rem;
    color: var(--text-dim);
    font-weight: 500;
    pointer-events: none;
    z-index: 1;
}

.input-prefix input {
    padding-left: 1.75rem;
}

/* Select dropdown arrow */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
    cursor: pointer;
}

/* Global Tooltip Element (escapes all backdrop-filter containing blocks) */
.global-tooltip {
    position: fixed;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 400;
    line-height: 1.5;
    white-space: normal;
    width: 400px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-card);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: 10000;
    pointer-events: none;
}

/* Base style for text that triggers the tooltip */
.info-tip, .tooltip-inline {
    cursor: help;
    display: inline-block;
    position: relative;
    font-size: 0.8rem;
}

/* ============================================
   Primary Button
   ============================================ */

.form-actions {
    text-align: center;
    margin-top: var(--space-xl);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.85rem 2.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast),
        filter var(--transition-fast);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.45);
    filter: brightness(1.08);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.btn-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

/* ============================================
   Results Section
   ============================================ */

.results-section {
    margin-top: var(--space-2xl);
    animation: fade-in-up 0.5s ease-out;
}

@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-xl);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

@media (max-width: 700px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
}

/* Result card (extends card) */
.result-card {
    background: var(--gradient-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    animation: fade-in-up 0.5s ease-out backwards;
}

.result-card:nth-child(1) { animation-delay: 0.05s; }
.result-card:nth-child(2) { animation-delay: 0.1s; }
.result-card:nth-child(3) { animation-delay: 0.15s; }
.result-card:nth-child(4) { animation-delay: 0.2s; }

.result-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-bright);
    margin-bottom: var(--space-md);
}

.card-wide {
    grid-column: 1 / -1;
}

/* ============================================
   Result Tables
   ============================================ */

.result-table {
    width: 100%;
    border-collapse: collapse;
}

.result-table td {
    padding: 0.5rem 0;
    font-size: 0.9rem;
    vertical-align: baseline;
}

.result-table tr {
    border-bottom: 1px solid rgba(99, 102, 241, 0.06);
}

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

.result-table .amount {
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    white-space: nowrap;
}

.result-table .dim {
    color: var(--text-dim);
    font-weight: 400;
}

.result-table .deduction {
    color: var(--danger);
}

.result-table .indent {
    padding-left: 1.2rem;
    color: var(--text-dim);
    font-size: 0.82rem;
}

.result-table .detail {
    display: block;
    font-size: 0.78rem;
    color: var(--text-dim);
    font-weight: 400;
}

.total-row {
    border-top: 1px solid rgba(99, 102, 241, 0.15) !important;
}

.total-row.highlight td {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    font-size: 0.95rem;
}

.total-row.highlight .amount {
    color: var(--accent-bright);
}

.sub-row td {
    padding-top: 0.15rem;
    padding-bottom: 0.15rem;
}

/* ============================================
   Safe Harbor Status
   ============================================ */

.harbor-status {
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
}

.harbor-pass .harbor-status {
    background: var(--success-bg);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.harbor-fail .harbor-status {
    background: var(--danger-bg);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.status-badge {
    display: inline-block;
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.status-badge.pass { color: var(--success); }
.status-badge.fail { color: var(--danger); }

.harbor-status p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.pass-text { color: var(--success) !important; }
.fail-text { color: var(--danger) !important; }

/* ============================================
   Quarterly Recommendation Cards
   ============================================ */

.quarterly-recommendation {
    margin-top: var(--space-lg);
}

.quarterly-recommendation h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    text-align: center;
}

.route-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

@media (max-width: 500px) {
    .route-cards {
        grid-template-columns: 1fr;
    }
}

.route-card {
    position: relative;
    text-align: center;
    padding: var(--space-lg) var(--space-md);
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.route-card.recommended {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
    background: rgba(99, 102, 241, 0.06);
}

.recommended-badge {
    position: absolute;
    top: -0.65rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: white;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.8rem;
    border-radius: 999px;
    white-space: nowrap;
}

.route-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.route-amount {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.route-card.recommended .route-amount {
    color: var(--accent-bright);
}

.route-detail {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-top: var(--space-xs);
}

/* ============================================
   Footer
   ============================================ */

.app-footer {
    text-align: center;
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(99, 102, 241, 0.08);
}

.app-footer p {
    font-size: 0.82rem;
    color: var(--text-dim);
    max-width: 600px;
    margin: 0 auto;
}

.footer-meta {
    margin-top: var(--space-sm);
    font-size: 0.75rem !important;
    color: rgba(100, 116, 139, 0.6) !important;
}