/* CSS Variables */
:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-card: #242424;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-green: #00d4aa;
    --accent-green-dark: #00a888;
    --accent-red: #ff6b6b;
    --accent-orange: #ffa500;
    --accent-blue: #4da6ff;
    --accent-gold: #ffd700;
    --border-color: #333333;
    --input-bg: #1a1a1a;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 15px rgba(0, 0, 0, 0.4);
}

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 40px 20px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.card h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.icon {
    font-size: 1.4rem;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 30px;
}

@media (min-width: 768px) {
    .calculator-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Input Rows */
.input-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 15px;
}

.input-row label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-wrapper input {
    width: 80px;
    padding: 10px 12px;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    text-align: right;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--accent-green);
}

.input-suffix {
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-width: 40px;
}

.currency-input {
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0 12px;
    transition: border-color 0.2s;
}

.currency-input:focus-within {
    border-color: var(--accent-green);
}

.currency-symbol {
    color: var(--text-secondary);
    font-weight: 600;
}

.currency-input input {
    width: 120px;
    padding: 10px 8px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    text-align: right;
}

.currency-input input:focus {
    outline: none;
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--bg-primary);
    background: linear-gradient(135deg, var(--accent-green), var(--accent-green-dark));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 40px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.4);
}

/* Results Section */
.results-section {
    animation: fadeIn 0.5s ease;
}

.results-section.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Result Hero */
.result-hero {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    margin-bottom: 30px;
    border: 2px solid var(--border-color);
}

.result-hero.success {
    border-color: var(--accent-green);
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1), rgba(0, 168, 136, 0.05));
}

.result-hero.warning {
    border-color: var(--accent-orange);
    background: linear-gradient(135deg, rgba(255, 165, 0, 0.1), rgba(255, 140, 0, 0.05));
}

.result-hero.danger {
    border-color: var(--accent-red);
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(204, 85, 85, 0.05));
}

.result-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.status-icon {
    font-size: 2rem;
}

.status-text {
    font-size: 1.5rem;
    font-weight: 600;
}

.result-hero.success .status-text { color: var(--accent-green); }
.result-hero.warning .status-text { color: var(--accent-orange); }
.result-hero.danger .status-text { color: var(--accent-red); }

.money-lasts {
    margin: 30px 0;
}

.money-lasts .label {
    display: block;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.money-lasts .age-value {
    font-size: 5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-summary {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Results Grid */
.results-grid {
    display: grid;
    gap: 24px;
    margin-bottom: 30px;
}

@media (min-width: 768px) {
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Numbers Card */
.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row.highlight {
    background: rgba(0, 212, 170, 0.1);
    margin: 0 -24px;
    padding: 12px 24px;
    border-radius: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.stat-value {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.stat-row.highlight .stat-value {
    color: var(--accent-green);
}

/* Chart Card */
.chart-card {
    min-height: 350px;
}

.chart-container {
    position: relative;
    height: 280px;
}

/* Scenarios Table */
.scenarios-table {
    width: 100%;
    border-collapse: collapse;
}

.scenarios-table th,
.scenarios-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.scenarios-table th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
}

.scenarios-table tr.current {
    background: rgba(0, 212, 170, 0.1);
}

.scenarios-table tr.current td {
    color: var(--accent-green);
    font-weight: 600;
}

.scenarios-table .success { color: var(--accent-green); }
.scenarios-table .warning { color: var(--accent-orange); }
.scenarios-table .danger { color: var(--accent-red); }

/* Tips Card */
.tips-card ul {
    list-style: none;
}

.tips-card li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.tips-card li:last-child {
    border-bottom: none;
}

.tips-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: bold;
}

.tips-card li strong {
    color: var(--text-primary);
}

/* FAQ Section */
.faq-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.faq-section h2 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: 30px;
}

.faq-item {
    background: var(--bg-card);
    border-radius: 12px;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: background 0.2s;
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--accent-green);
    transition: transform 0.3s;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.open {
    max-height: 500px;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-answer strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

.disclaimer {
    margin-top: 10px;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Mobile Optimizations */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }

    .card {
        padding: 18px;
    }

    .input-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .currency-input {
        width: 100%;
    }

    .currency-input input {
        width: 100%;
        text-align: left;
    }

    .input-wrapper {
        width: 100%;
    }

    .input-wrapper input {
        flex: 1;
        text-align: left;
    }

    .money-lasts .age-value {
        font-size: 4rem;
    }

    .result-hero {
        padding: 30px 20px;
    }

    .scenarios-table th,
    .scenarios-table td {
        padding: 10px 6px;
        font-size: 0.85rem;
    }
}

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

input[type="number"] {
    -moz-appearance: textfield;
}


/* Footer Links */
footer a {
    color: var(--accent-green);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.related-tools {
    margin: 10px 0;
    font-size: 0.85rem;
}

/* CTA Box */
.cta-box {
    background: linear-gradient(135deg, #1a2a3a, #0d1a2a);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.cta-box h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.cta-box p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.cta-button {
    display: inline-block;
    background: var(--accent-gold);
    color: #000;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.4);
    text-decoration: none;
}