/* ============================================================
   LAYOUT.CSS — Container, section structure, and shared layout
   ============================================================ */

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

.section-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-lg);
    position: relative;
    letter-spacing: -0.025em;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 3rem;
    height: 0.1875rem;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-width: 140px;
    font-family: inherit;
    letter-spacing: 0.025em;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(6, 182, 212, 0.2);
}

.btn-primary:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.35);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

/* ── Responsive layout ── */
@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
        --section-padding: 4rem 0;
    }
    .about-content { grid-template-columns: 1fr; }
    .contact-content { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    :root {
        --space-4xl: 3rem;
        --space-3xl: 2rem;
        --space-2xl: 1.5rem;
    }
    .container { padding-left: 15px; padding-right: 15px; width: 100%; }
}

@media (max-width: 360px) {
    html { font-size: 14px; }
}