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

:root {
    --color-primary:   #1a73e8;
    --color-dark:      #1a1a2e;
    --color-light:     #f5f7fa;
    --color-text:      #333;
    --color-muted:     #666;
    --color-border:    #e0e0e0;
    --font-base:       'Segoe UI', Arial, sans-serif;
    --radius:          8px;
    --shadow:          0 2px 12px rgba(0,0,0,.08);
    --transition:      .25s ease;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-base);
    color: var(--color-text);
    background: #fff;
    line-height: 1.6;
    font-size: 16px;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ── Layout ── */
.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* ── Header ── */
.site-header {
    background: var(--color-dark);
    color: #fff;
    padding: 0 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}
.logo:hover { text-decoration: none; opacity: .85; }

.nav a {
    color: #ccc;
    margin-left: 1.5rem;
    font-size: .95rem;
    transition: color var(--transition);
}
.nav a:hover { color: #fff; text-decoration: none; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ── Hero ── */
.hero {
    background: linear-gradient(135deg, var(--color-dark) 0%, #16213e 100%);
    color: #fff;
    padding: 100px 0;
    text-align: center;
}

.hero h1 { font-size: 2.8rem; margin-bottom: 1rem; line-height: 1.2; }
.hero p  { font-size: 1.2rem; color: #aac; margin-bottom: 2rem; }

.btn {
    display: inline-block;
    padding: .75rem 2rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity var(--transition), transform var(--transition);
    border: none;
}
.btn:hover { opacity: .88; transform: translateY(-2px); text-decoration: none; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-outline  { background: transparent; border: 2px solid #fff; color: #fff; margin-left: 1rem; }

/* ── Sections ── */
section { padding: 70px 0; }

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: .5rem;
    color: var(--color-dark);
}
.section-sub {
    text-align: center;
    color: var(--color-muted);
    margin-bottom: 3rem;
}

/* ── Cards ── */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--color-light);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,.12); }
.card h3 { font-size: 1.2rem; margin-bottom: .5rem; color: var(--color-dark); }
.card p  { color: var(--color-muted); font-size: .95rem; }
.card-icon { font-size: 2rem; margin-bottom: 1rem; }

/* ── Forms ── */
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; margin-bottom: .4rem; font-weight: 600; font-size: .9rem; }
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: .65rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-base);
    transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}
.form-group textarea { resize: vertical; min-height: 130px; }

.alert {
    padding: .85rem 1.2rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: .95rem;
}
.alert-success { background: #e6f4ea; color: #2d6a4f; border: 1px solid #b7dfca; }
.alert-error   { background: #fdecea; color: #b00020; border: 1px solid #f5c6cb; }

/* ── Blog ── */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.blog-card {
    background: var(--color-light);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform var(--transition);
}
.blog-card:hover { transform: translateY(-4px); }
.blog-card-body { padding: 1.5rem; }
.blog-card h3 { font-size: 1.1rem; margin-bottom: .4rem; }
.blog-card .meta { font-size: .82rem; color: var(--color-muted); margin-bottom: .75rem; }
.blog-card p { font-size: .92rem; color: var(--color-muted); }

/* ── Page header ── */
.page-hero {
    background: var(--color-dark);
    color: #fff;
    padding: 60px 0;
    text-align: center;
}
.page-hero h1 { font-size: 2.2rem; }
.page-hero p  { color: #aac; margin-top: .5rem; }

/* ── Footer ── */
.site-footer {
    background: var(--color-dark);
    color: #aaa;
    padding: 2rem 0;
    text-align: center;
    font-size: .9rem;
}
.footer-nav { margin-top: .75rem; }
.footer-nav a { color: #aaa; margin: 0 .75rem; }
.footer-nav a:hover { color: #fff; text-decoration: none; }

/* ── Blog Post Body ── */
.post-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text);
}
.post-body p { margin-bottom: 1.2rem; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .btn-outline { margin-left: 0; margin-top: .75rem; }

    .nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--color-dark); padding: 1rem 1.5rem; }
    .nav.open { display: flex; }
    .nav a { margin: .5rem 0; }
    .nav-toggle { display: block; }
}