/* ═══════════════════════════════════════════
   header.css — Fixed navigation bar
   ═══════════════════════════════════════════ */

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,.1);
    transition: box-shadow var(--ease);
}

[data-theme="light"] header {
    background-color: rgba(249, 250, 251, 0.8);
}

header.scrolled {
    box-shadow: 0 4px 15px rgba(0,0,0,.2);
}

/* ── Layout ── */
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
}

/* ── Logo ── */
.logo {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ── Desktop nav ── */
.desktop-nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text);
    font-weight: 500;
    position: relative;
    padding-bottom: 4px;
    transition: color var(--ease);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width var(--ease);
}

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

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

/* ── Resume download link ── */
.nav-resume {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white !important;
    border-radius: 8px;
    font-weight: 600;
    transition: transform var(--ease), box-shadow var(--ease);
}

.nav-resume::after {
    display: none;
}

.nav-resume:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* ── Theme toggle ── */
.theme-toggle {
    font-size: 1.2rem;
    color: var(--text);
    margin-left: 1.5rem;
    transition: transform var(--ease), color var(--ease);
}

.theme-toggle:hover {
    transform: rotate(20deg);
    color: var(--primary);
}

/* ── Hamburger (hidden on desktop) ── */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    padding: 0.5rem;
    margin: -0.5rem;
    /* Larger touch target for mobile */
}

.bar {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--text);
    border-radius: 10px;
    transition: transform var(--ease), opacity var(--ease);
}

/* Hamburger animation when menu is open */
.mobile-menu-toggle.active .bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.mobile-menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ── Mobile dropdown ── */
.mobile-menu {
    position: fixed;
    top: -100%;
    left: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--bg-elevated);
    z-index: 99;
    padding: 1.5rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,.2);
    transition: top 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    max-height: calc(100vh - 75px);
    overflow-y: auto;
}

.mobile-menu.open {
    top: 75px;
}

.mobile-nav-link {
    color: var(--text);
    font-weight: 500;
    padding: 1rem 2rem;
    width: 100%;
    text-align: center;
    transition: background-color var(--ease), color var(--ease);
    /* Better touch target */
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
    color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
}

/* Active state for mobile nav */
.mobile-nav-link.active {
    color: var(--primary);
    background-color: rgba(99, 102, 241, 0.15);
    border-left: 3px solid var(--primary);
}