:root {
    --theme-transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

body.dark-theme {
    --bg-main: #000000;
    --bg-surface: #0f1422;
    --bg-nav: rgba(0, 0, 0, 0.85);
    --text-primary: #f9fafb;
    --text-secondary: #94a3b8;
    --accent: #d4af37;
    --accent-hover: #b5942b;
    --alert: #ef4444;
    --border-color: #1f2937;
}

body.light-theme {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-nav: rgba(248, 250, 252, 0.85);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent: #b5942b;
    --accent-hover: #91751e;
    --alert: #dc2626;
    --border-color: #e2e8f0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html { scroll-behavior: smooth; }
body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: var(--theme-transition);
    line-height: 1.6;
}

.section-container { max-width: 1100px; margin: 0 auto; padding: 4rem 2rem; }
h2 { font-size: 2.2rem; margin-bottom: 1rem; text-align: center; letter-spacing: -0.5px; }
.section-subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 3rem; font-size: 1.1rem; }

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%;
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 4rem; background-color: var(--bg-nav);
    backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color);
    z-index: 1000; transition: var(--theme-transition);
}
.logo-container { display: flex; align-items: center; gap: 0.75rem; }
.site-logo-nav { height: 36px; width: auto; object-fit: contain; }
.logo-text { font-weight: 700; font-size: 1.3rem; letter-spacing: -0.5px; }
.dot-com { color: var(--accent); }
.nav-links a { color: var(--text-secondary); text-decoration: none; margin-left: 2rem; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }

.theme-btn {
    background: none; border: 1px solid var(--border-color); padding: 0.5rem;
    border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center;
}

/* Hero Background Image Settings */
.hero-section {
    min-height: 80vh; margin-top: 60px;
    background-image: url('logo.png');
    background-size: contain; background-position: center top; background-repeat: no-repeat;
    display: flex; align-items: flex-end; justify-content: center;
}
.hero-overlay {
    width: 100%; padding: 6rem 2rem 4rem; text-align: center;
}
body.dark-theme .hero-overlay {
    background: linear-gradient(to top, var(--bg-main) 65%, rgba(11,15,25,0.7) 100%);
}
body.light-theme .hero-overlay {
    background: linear-gradient(to top, var(--bg-main) 65%, rgba(248,250,252,0.65) 100%);
    backdrop-filter: blur(2px);
}
.hero-content { max-width: 750px; margin: 0 auto; }
.hero-content h1 { font-size: 3.5rem; margin-bottom: 1.5rem; letter-spacing: -1px; font-weight: 800; }
.hero-content p { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 2rem; }
.hero-buttons { display: flex; gap: 1rem; justify-content: center; }

/* Buttons */
.btn { display: inline-block; padding: 0.8rem 2rem; border-radius: 6px; font-weight: 600; text-decoration: none; transition: all 0.2s; cursor: pointer; border: none; }
.btn-primary { background-color: var(--accent); color: #000; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: transparent; color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: var(--bg-surface); }

/* Grid Components */
.about-section { background-color: var(--bg-surface); padding: 4rem 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.about-grid, .resources-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.about-card, .resource-card { background-color: var(--bg-main); padding: 2.5rem; border-radius: 8px; border: 1px solid var(--border-color); }
.about-card h3, .resource-card h3 { font-size: 1.4rem; margin-bottom: 1rem; color: var(--accent); }
.about-card p, .resource-card p { color: var(--text-secondary); }

.resource-card { position: relative; }
.badge { display: inline-block; padding: 0.25rem 0.6rem; font-size: 0.75rem; font-weight: 700; border-radius: 4px; background: rgba(212,175,55,0.15); color: var(--accent); margin-bottom: 0.75rem; text-transform: uppercase; }
.badge.analysis { background: rgba(56,189,248,0.15); color: #38bdf8; }

/* Visual Chart Component Wrapper */
.chart-wrapper { background-color: var(--bg-surface); border: 1px solid var(--border-color); padding: 2rem; border-radius: 8px; margin-bottom: 2rem; height: 350px; }
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; }
.metric-card { background-color: var(--bg-surface); border: 1px solid var(--border-color); padding: 2rem; border-radius: 8px; text-align: center; }
.metric-card h4 { font-size: 2.5rem; color: var(--accent); margin-bottom: 0.5rem; }
.metric-card.alert h4 { color: var(--alert); }

/* Top 20 Table Structures */
.table-wrapper { width: 100%; overflow-x: auto; background-color: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 8px; padding: 1rem; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; color: var(--text-primary); }
.data-table th, .data-table td { padding: 1rem; border-bottom: 1px solid var(--border-color); }
.data-table th { color: var(--accent); font-weight: 600; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.5px; }
.data-table tr:hover { background-color: rgba(212,175,55,0.03); }

/* Email Forms */
.action-section { padding: 4rem 2rem; display: flex; justify-content: center; }
.action-card { background-color: var(--bg-surface); border: 1px solid var(--border-color); padding: 3rem; border-radius: 12px; max-width: 700px; width: 100%; text-align: center; }
.action-card h3 { font-size: 1.8rem; margin-bottom: 1rem; }
.action-card p { color: var(--text-secondary); margin-bottom: 2rem; }
#action-form { display: flex; gap: 0.5rem; max-width: 500px; margin: 0 auto; }
#user-email { flex: 1; padding: 0.8rem 1rem; border-radius: 6px; border: 1px solid var(--border-color); background-color: var(--bg-main); color: var(--text-primary); outline: none; }
.btn-submit { background-color: var(--text-primary); color: var(--bg-main); }

footer { text-align: center; padding: 3rem 2rem; color: var(--text-secondary); border-top: 1px solid var(--border-color); font-size: 0.9rem; }
footer a { color: var(--accent); text-decoration: none; margin-left: 0.5rem; }

@media (max-width: 768px) {
    .navbar { padding: 1rem 2rem; }
    .nav-links { display: none; }
    .hero-content h1 { font-size: 2.4rem; }
    .hero-section { min-height: 60vh; }
    #action-form { flex-direction: column; }
}