/* ── CSS Custom Properties (Theming) ──────────────────────────── */

:root {
    /* Shared palette — matches stock screener dashboard */
    --green:        #1D9E75;
    --green-light:  #5DCAA5;
    --red:          #E24B4A;
    --amber:        #EF9F27;
    --grey:         #888780;

    /* Spacing */
    --container-max: 1100px;
    --section-pad:   4rem 0;
    --card-radius:   12px;
    --header-height: 60px;

    /* Transition */
    --transition:   0.25s ease;
}

/* Dark theme (default) */
[data-theme="dark"] {
    --bg:           #0f1117;
    --bg-card:      #1a1d27;
    --bg-header:    #13151e;
    --text:         #e4e4e7;
    --text-muted:   #9ca3af;
    --text-heading: #f4f4f5;
    --border:       #2a2d3a;
    --badge-live-bg:   var(--green);
    --badge-live-text: #fff;
    --badge-soon-bg:   #2a2d3a;
    --badge-soon-text: var(--text-muted);
    --tag-bg:       #222536;
    --tag-text:     var(--green-light);
    --card-hover:   #1f2230;
    --hero-bg:      linear-gradient(135deg, #0f1117 0%, #141824 100%);
}

/* Light theme */
[data-theme="light"] {
    --bg:           #f8f9fa;
    --bg-card:      #ffffff;
    --bg-header:    #ffffff;
    --text:         #374151;
    --text-muted:   #6b7280;
    --text-heading: #111827;
    --border:       #e5e7eb;
    --badge-live-bg:   var(--green);
    --badge-live-text: #fff;
    --badge-soon-bg:   #f3f4f6;
    --badge-soon-text: var(--text-muted);
    --tag-bg:       #ecfdf5;
    --tag-text:     var(--green);
    --card-hover:   #f9fafb;
    --hero-bg:      linear-gradient(135deg, #f8f9fa 0%, #eef2f7 100%);
}

/* ── Reset & Base ────────────────────────────────────────────── */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── Header ──────────────────────────────────────────────────── */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
    transition: background var(--transition), border-color var(--transition);
    backdrop-filter: blur(12px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--green);
    letter-spacing: -0.5px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 0.7rem;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: border-color var(--transition);
}

.theme-toggle:hover {
    border-color: var(--green);
}

/* Show/hide sun/moon based on theme */
[data-theme="dark"] .icon-sun  { display: inline; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: inline; }

/* ── Hero ────────────────────────────────────────────────────── */

.hero {
    background: var(--hero-bg);
    padding: 5rem 0 4rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
    transition: border-color var(--transition);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-heading);
    margin-bottom: 0.75rem;
    transition: color var(--transition);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 550px;
    margin: 0 auto;
    transition: color var(--transition);
}

/* ── Topic Sections ──────────────────────────────────────────── */

.topic-section {
    padding: var(--section-pad);
    border-bottom: 1px solid var(--border);
    transition: border-color var(--transition);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.75rem;
}

.section-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.section-header h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-heading);
    transition: color var(--transition);
}

/* ── Card Grid ───────────────────────────────────────────────── */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: 1.5rem;
    position: relative;
    transition: background var(--transition), border-color var(--transition),
                transform 0.15s ease, box-shadow 0.15s ease;
}

.card--live:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(29, 158, 117, 0.15);
    border-color: var(--green);
    cursor: pointer;
}

.card--placeholder {
    opacity: 0.7;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 650;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
    margin-top: 0.5rem;
    transition: color var(--transition);
}

.card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 1rem;
    transition: color var(--transition);
}

/* ── Badges ──────────────────────────────────────────────────── */

.card-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
}

.badge--live {
    background: var(--badge-live-bg);
    color: var(--badge-live-text);
}

.badge--soon {
    background: var(--badge-soon-bg);
    color: var(--badge-soon-text);
    transition: background var(--transition), color var(--transition);
}

/* ── Tags ────────────────────────────────────────────────────── */

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.15rem 0.55rem;
    border-radius: 5px;
    background: var(--tag-bg);
    color: var(--tag-text);
    transition: background var(--transition), color var(--transition);
}

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

.site-footer {
    padding: 2.5rem 0;
    text-align: center;
}

.site-footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: color var(--transition);
}

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

@media (max-width: 640px) {
    .hero {
        padding: 3rem 0 2.5rem;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .section-header h2 {
        font-size: 1.3rem;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
}