/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.navbar-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-logo:hover {
    color: var(--accent-light);
}

.nav-links {
    display: flex;
    gap: 32px;
    position: relative;
}

.nav-link {
    color: var(--text-secondary);
    font-size: var(--small-size);
    font-weight: 500;
    padding: 4px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-light);
    transition: width var(--transition-base);
    border-radius: 1px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    width: 100%;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile overlay */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    background-color: var(--mobile-menu-bg);
    z-index: 999;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 32px;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu.open {
    display: flex;
    opacity: 1;
}

.mobile-menu .nav-link {
    font-size: 1.25rem;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    padding: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.theme-toggle:hover {
    color: var(--accent-light);
    border-color: var(--accent);
    background-color: var(--accent-bg-subtle);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* Icon visibility managed by JS via inline style */

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* Sections */
.section {
    padding: var(--section-padding) 0;
}

.section-title {
    font-size: var(--h2-size);
    margin-bottom: 48px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 48px;
    height: 3px;
    background-color: var(--accent);
    border-radius: 2px;
}

/* Grid */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}