:root {
    --primary: #0353a4;
    --accent: #00b4d8;
    --background: #f8fbff;
    --surface: #ffffff;
    --surface-strong: #e2e8f0;
    --text: #0f172a;
    --muted: #475569;
    --border: rgba(3, 83, 164, 0.12);
    --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);

    --radius-pill: 999px;
    --radius-card: 24px;
    --transition-fast: 180ms ease;
    --max-page-width: min(1200px, calc(100% - 3rem));
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5.5rem;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.65;
    color: var(--text);
    background: var(--background);
    transition: background var(--transition-fast), color var(--transition-fast);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, rgba(3, 83, 164, 0.08), transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    width: var(--max-page-width);
    margin: 0 auto;
}

.site-navbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.82);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
}

body.dark-theme .site-navbar {
    background: rgba(17, 26, 43, 0.88);
}

.brand {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--primary);
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-links a,
.theme-toggle {
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-links a:hover,
.theme-toggle:hover {
    color: var(--primary);
    transform: translateY(-1px);
}

.theme-controls {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-select select {
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: var(--surface);
    color: var(--text);
    padding: 0.55rem 0.9rem;
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.theme-select select:hover,
.theme-select select:focus {
    border-color: var(--primary);
    outline: none;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
}

.hero {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 7rem 1.5rem 3rem;
    text-align: center;
}

.hero-content {
    max-width: 760px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.2rem;
    border-radius: var(--radius-pill);
    background: rgba(3, 83, 164, 0.1);
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2.8rem, 5vw, 4.4rem);
    line-height: 1.03;
    margin: 0 0 1rem;
}

.highlight {
    color: var(--primary);
}

.hero p {
    max-width: 740px;
    margin: 0 auto;
    color: var(--muted);
    font-size: 1.05rem;
}

.hero-actions {
    margin-top: 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.95rem 1.65rem;
    border-radius: var(--radius-pill);
    font-weight: 700;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.button-primary {
    background: var(--primary);
    color: #ffffff;
    box-shadow: 0 20px 40px rgba(3, 83, 164, 0.18);
}

.button-secondary {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
}

.button-primary:hover,
.button-secondary:hover {
    transform: translateY(-2px);
}

main {
    padding: 3rem 0 4rem;
}

.section-container {
    padding: 4rem 0;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2.25rem;
    display: inline-flex;
    padding-bottom: 0.65rem;
    border-bottom: 3px solid var(--primary);
}

.split-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, 1fr);
    gap: 2rem;
}

.panel,
.project-card,
.skill-card,
.statement-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow);
    padding: 1.9rem;
}

.panel h3,
.project-card h3,
.skill-card h3,
.statement-card h3,
.analytics-card h3 {
    margin-top: 0;
    color: var(--primary);
}

.panel p,
.statement-card p,
.skill-card p,
.project-card p {
    color: var(--muted);
}

.metrics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.metric-card {
    background: var(--surface-strong);
    padding: 1rem;
    border-radius: 18px;
    border: 1px solid var(--border);
}

.metric-card h4 {
    margin: 0 0 0.45rem;
    font-size: 0.95rem;
}

.section-grid {
    display: grid;
    gap: 1.5rem;
}

.section-grid--spaced > * + * {
    margin-top: 1.5rem;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-top: 1rem;
}

.tag {
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-pill);
    background: rgba(3, 83, 164, 0.08);
    color: var(--text);
    font-size: 0.85rem;
}

.projects-grid,
.analytics-grid {
    display: grid;
    gap: 1.5rem;
}

.analytics-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    margin-top: 1.5rem;
}

.analytics-card {
    padding: 1.75rem;
}

.analytics-card .stat-value {
    font-size: 2.4rem;
    margin: 0.5rem 0 0;
    color: var(--text);
}

.analytics-note,
.contact-panel p,
.footer-text,
.project-card ul,
.project-card li {
    color: var(--muted);
}

.project-card ul {
    margin: 1rem 0 0;
    padding-left: 1.2rem;
}

.project-card li {
    margin-bottom: 0.65rem;
}

.project-card[data-analytics-label="Gajmer Bandhu Pratishthan"]:hover {
    cursor: pointer;
    transform: scale(1.02);
    transition: transform 0.2s ease;
}

.contact-panel {
    text-align: center;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.contact-links a {
    width: 3.25rem;
    height: 3.25rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.contact-links a:hover {
    transform: translateY(-3px);
    background: rgba(3, 83, 164, 0.1);
    color: var(--primary);
}

.footer-text {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.95rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

@media (max-width: 980px) {
    .split-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 720px) {
    .site-navbar {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-links {
        justify-content: center;
    }

    .hero {
        padding-top: 6rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero h1 {
        font-size: 2.65rem;
    }

    section {
        padding: 3rem 0;
    }
}