/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #22223a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --accent-gold: #f5a623;
    --accent-green: #00d68f;
    --accent-blue: #4c6ef5;
    --accent-red: #ff6b6b;
    --accent-purple: #a855f7;
    --accent-orange: #ff922b;
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --gradient-accent: linear-gradient(135deg, #4c6ef5, #a855f7);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
    --radius: 16px;
    --radius-sm: 10px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER ===== */
.header {
    padding: 20px 0;
    text-align: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo span {
    -webkit-text-fill-color: var(--text-primary);
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    padding: 50px 20px 35px;
    background: var(--gradient-hero);
    border-radius: 0 0 32px 32px;
    margin-bottom: 32px;
}

.hero h1 {
    font-size: clamp(1.6rem, 5vw, 2.8rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.hero h1 .highlight {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: clamp(0.95rem, 2.5vw, 1.15rem);
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto;
}

/* ===== INPUT SECTION ===== */
.input-section {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow-card);
    margin-bottom: 32px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.input-row {
    display: flex;
    gap: 16px;
    align-items: stretch;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 180px;
    display: flex;
    flex-direction: column;
}

.input-group label,
.stock-search label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    height: 20px;
}

.input-group input,
.input-group select,
.stock-search input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 2px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font);
    transition: border-color 0.3s, box-shadow 0.3s;
    outline: none;
    flex-grow: 1;
}

.input-group input:focus,
.input-group select:focus,
.stock-search input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 4px rgba(76, 110, 245, 0.15);
}

.input-group input::placeholder,
.stock-search input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.input-group select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

.calculate-btn {
    padding: 12px 28px;
    background: var(--gradient-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--font);
    cursor: pointer;
    white-space: nowrap;
    transition: transform 0.2s, box-shadow 0.2s;
    align-self: flex-end;
    margin-top: auto;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(76, 110, 245, 0.35);
}

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

.calculate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.quick-amounts {
    display: flex;
    gap: 6px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.quick-btn {
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.2s;
}

.quick-btn:hover {
    background: rgba(76, 110, 245, 0.15);
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

/* ===== STOCK SEARCH DROPDOWN ===== */
.stock-search {
    flex: 1.5;
    min-width: 250px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.stock-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 100;
    background: #1e1e36;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    margin-top: 4px;
    max-height: 350px;
    overflow-y: auto;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.stock-option {
    padding: 10px 14px;
    cursor: pointer;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    transition: background 0.15s;
}

.stock-option:last-child {
    border-bottom: none;
}

.stock-option.highlighted {
    background: rgba(76, 110, 245, 0.15);
}

.stock-option.selected {
    background: rgba(76, 110, 245, 0.1);
    border-left: 3px solid var(--accent-blue);
}

.stock-option-main {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 2px;
}

.stock-symbol {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--accent-blue);
    min-width: 90px;
}

.stock-name {
    font-size: 0.85rem;
    color: var(--text-primary);
}

.stock-sector {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ===== RESULTS ===== */
.results-section {
    margin-bottom: 32px;
}

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

.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

/* Main Result Card */
.main-result-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    margin-bottom: 24px;
    border: 2px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.main-result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.main-result-card.profit::before {
    background: var(--accent-green);
}

.main-result-card.loss::before {
    background: var(--accent-red);
}

.result-emoji {
    font-size: 3rem;
    margin-bottom: 8px;
}

.main-result-card h2 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.main-result-card h2 strong {
    color: var(--text-primary);
}

.years-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.big-value {
    font-size: clamp(2rem, 6vw, 3.2rem);
    font-weight: 900;
    margin: 8px 0 16px;
}

.main-result-card.profit .big-value {
    color: var(--accent-green);
}

.main-result-card.loss .big-value {
    color: var(--accent-red);
}

.result-meta {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

.badge.profit {
    background: rgba(0, 214, 143, 0.15);
    color: var(--accent-green);
}

.badge.loss {
    background: rgba(255, 107, 107, 0.15);
    color: var(--accent-red);
}

.cagr-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
}

.abs-gain {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 20px;
}

.abs-gain.profit {
    background: rgba(0, 214, 143, 0.08);
    color: var(--accent-green);
}

.abs-gain.loss {
    background: rgba(255, 107, 107, 0.08);
    color: var(--accent-red);
}

/* Comparison Grid */
.section-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin: 24px 0 12px;
    text-align: center;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.comp-card {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    padding: 18px 14px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.2s;
}

.comp-card.winner {
    border-color: rgba(0, 214, 143, 0.3);
    background: rgba(0, 214, 143, 0.05);
}

.comp-card:hover {
    transform: translateY(-2px);
}

.comp-icon {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.comp-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 6px;
}

.comp-value {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.comp-return {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-green);
}

/* Verdict */
.verdict-banner {
    background: linear-gradient(135deg, rgba(76, 110, 245, 0.08), rgba(168, 85, 247, 0.08));
    border: 1px solid rgba(76, 110, 245, 0.2);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    text-align: center;
    margin-bottom: 20px;
}

.verdict-banner p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.verdict-banner strong {
    color: var(--text-primary);
}

/* Error */
.error-banner {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    text-align: center;
    color: var(--accent-red);
    font-size: 0.95rem;
}

/* Chart */
.chart-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.chart-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 14px;
    text-align: center;
}

.chart-card canvas {
    width: 100% !important;
    max-height: 280px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
    opacity: 0.6;
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: 16px;
}

.popular-stocks {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.popular-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.popular-tag {
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 0.8rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

/* ===== POPULAR EXAMPLES SECTION ===== */
.popular-examples,
.top-performers,
.faq-section {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.section-heading {
    font-size: 1.4rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 6px;
}

.section-sub {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 20px;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
}

.example-card {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    padding: 16px;
    cursor: pointer;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.example-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.example-label {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.example-result {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 2px;
}

.example-card.profit .example-result {
    color: var(--accent-green);
}

.example-card.loss .example-result {
    color: var(--accent-red);
}

.example-pct {
    font-size: 0.8rem;
    font-weight: 600;
}

.example-pct.profit {
    color: var(--accent-green);
}

.example-pct.loss {
    color: var(--accent-red);
}

/* ===== TOP PERFORMERS ===== */
.performers-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.performer-block {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.performer-block h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.losers-block {
    max-width: 500px;
    margin: 0 auto;
}

.performer-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.performer-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
}

.performer-row:hover {
    background: rgba(76, 110, 245, 0.1);
}

.performer-rank {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 28px;
}

.performer-name {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 500;
}

.performer-return {
    font-size: 0.85rem;
    font-weight: 700;
}

.performer-return.profit {
    color: var(--accent-green);
}

.performer-return.loss {
    color: var(--accent-red);
}

/* ===== FAQ SECTION ===== */
.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.2s;
}

.faq-item:hover,
.faq-item.open {
    border-color: rgba(76, 110, 245, 0.3);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    font-size: 0.9rem;
    font-weight: 600;
}

.faq-toggle {
    font-size: 1.2rem;
    color: var(--accent-blue);
    font-weight: 700;
    min-width: 20px;
    text-align: center;
}

.faq-answer {
    padding: 0 18px 14px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Disclaimer & Footer */
.disclaimer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.78rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 32px;
}

.footer {
    text-align: center;
    padding: 28px 0;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .hero {
        padding: 35px 16px 25px;
        border-radius: 0 0 20px 20px;
    }

    .input-section {
        padding: 20px 16px;
    }

    .input-row {
        flex-direction: column;
        gap: 14px;
    }

    .input-group,
    .stock-search {
        min-width: 100%;
    }

    .calculate-btn {
        width: 100%;
        padding: 14px;
    }

    .comparison-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .comp-card {
        padding: 14px 8px;
    }

    .comp-value {
        font-size: 0.95rem;
    }

    .main-result-card {
        padding: 24px 16px;
    }

    .performers-tabs {
        grid-template-columns: 1fr;
    }

    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 400px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }

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

/* ===== ARTICLES SECTION ===== */
.articles-section {
    margin: 60px 0 40px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.article-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.06);
    transition: border-color 0.2s, transform 0.2s;
}

.article-card:hover {
    border-color: rgba(76, 110, 245, 0.35);
    transform: translateY(-2px);
}

.article-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-blue);
    background: rgba(76, 110, 245, 0.12);
    border-radius: 6px;
    padding: 3px 10px;
    margin-bottom: 14px;
}

.article-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 14px;
}

.article-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.article-card p:last-child {
    margin-bottom: 0;
}

.article-card ul {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    padding-left: 20px;
    margin-bottom: 12px;
}

.article-card ul li {
    margin-bottom: 4px;
}

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

/* ===== ABOUT SECTION ===== */
.about-section {
    margin: 40px 0 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.06);
    padding: 36px;
}

.about-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.about-content p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}

.about-content em {
    color: var(--accent-gold);
    font-style: italic;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.about-stat {
    text-align: center;
    background: rgba(76, 110, 245, 0.08);
    border-radius: var(--radius-sm);
    padding: 18px 12px;
    border: 1px solid rgba(76, 110, 245, 0.15);
}

.about-stat-num {
    display: block;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--accent-blue);
    line-height: 1.2;
}

.about-stat-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.about-disclaimer {
    font-size: 0.82rem !important;
    color: var(--text-muted) !important;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 14px;
    margin-top: 4px !important;
}

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

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .about-section {
        padding: 24px 18px;
    }
}