@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700&display=swap');

/* ── CSS Variables (light & dark) ── */
:root {
    --nav-h: 64px;
    --nav-bg: rgba(255, 255, 255, 0.92);
    --nav-border: #e8e5df;
    --nav-ink: #111110;
    --nav-muted: #6b6b65;
    --nav-accent: #1d4ed8;
    --nav-surface: #f4f3f0;

    /* Page-level (dark mode applies these to body) */
    --bg: #ffffff;
    --ink: #111110;
    --ink2: #4b4b46;
    --ink3: #9a9a93;
    --border: #e8e5df;
    --surface: #f7f6f3;
}

[data-theme="dark"] {
    --nav-bg: rgba(13, 13, 18, 0.92);
    --nav-border: #2a2a35;
    --nav-ink: #f1f1ee;
    --nav-muted: #9a9a93;
    --nav-surface: #1a1a24;

    --bg: #0d0d12;
    --ink: #f1f1ee;
    --ink2: #a8a8a2;
    --ink3: #6b6b65;
    --border: #2a2a35;
    --surface: #16161e;
}

/* Apply theme to page */
body {
    background: var(--bg);
    color: var(--ink);
    transition: background 0.3s, color 0.3s;
}

/* ── Nav shell ── */
header.fixed-top {
    padding: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
    font-family: 'Sora', sans-serif;
    z-index: 999;
}

.fk-nav {
    height: var(--nav-h);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 0 2.5rem;
    background: var(--nav-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--nav-border);
    transition: box-shadow 0.3s, background 0.3s, border-color 0.3s;
}

.fk-nav.scrolled {
    box-shadow: 0 2px 24px rgba(0, 0, 0, 0.07);
}

/* ── Logo (left) ── */
.fk-nav__logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--nav-ink);
    text-decoration: none;
    letter-spacing: -0.03em;
    justify-self: start;
    transition: color 0.2s;
}

.fk-nav__logo span {
    color: var(--nav-accent);
}

/* ── Center links ── */
.fk-nav__links {
    display: flex;
    align-items: center;
    gap: 0.15rem;
    justify-self: center;
}

.fk-nav__link {
    position: relative;
    padding: 6px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--nav-muted);
    text-decoration: none;
    border-radius: 6px;
    transition: color 0.2s;
    white-space: nowrap;
}

.fk-nav__link::after {
    content: '';
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 1px;
    height: 2px;
    border-radius: 2px;
    background: var(--nav-accent);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.25s ease;
}

.fk-nav__link:hover {
    color: var(--nav-ink);
}

.fk-nav__link:hover::after {
    transform: scaleX(0.5);
}

.fk-nav__link--active {
    color: var(--nav-accent) !important;
    font-weight: 600;
}

.fk-nav__link--active::after {
    transform: scaleX(1) !important;
}

/* ── Right side ── */
.fk-nav__right {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Theme toggle button */
.fk-nav__theme {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--nav-border);
    background: var(--nav-surface);
    color: var(--nav-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.fk-nav__theme:hover {
    border-color: var(--nav-accent);
    color: var(--nav-accent);
}

/* Show/hide sun & moon */
.fk-icon {
    transition: opacity 0.2s, transform 0.3s;
}

[data-theme="dark"] .fk-icon--moon {
    display: none;
}

[data-theme="dark"] .fk-icon--sun {
    display: block;
}

[data-theme="light"] .fk-icon--sun {
    display: none;
}

[data-theme="light"] .fk-icon--moon {
    display: block;
}

/* Default (light) */
.fk-icon--sun {
    display: none;
}

.fk-icon--moon {
    display: block;
}

/* Hamburger */
.fk-nav__burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: 1px solid var(--nav-border);
    border-radius: 8px;
    cursor: pointer;
    padding: 7px;
}

.fk-nav__burger span {
    display: block;
    height: 2px;
    background: var(--nav-ink);
    border-radius: 2px;
    transition: all 0.25s;
}

.fk-nav__burger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.fk-nav__burger.open span:nth-child(2) {
    opacity: 0;
}

.fk-nav__burger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile drawer */
.fk-nav__drawer {
    display: none;
    flex-direction: column;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    padding: 0.75rem 1.5rem 1.25rem;
    gap: 4px;
    backdrop-filter: blur(14px);
}

.fk-nav__drawer.open {
    display: flex;
}

.fk-nav__drawer-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--nav-muted);
    text-decoration: none;
    padding: 10px 4px;
    border-bottom: 1px solid var(--nav-border);
    transition: color 0.2s;
}

.fk-nav__drawer-link:last-child {
    border-bottom: none;
}

.fk-nav__drawer-link:hover {
    color: var(--nav-accent);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .fk-nav {
        padding: 0 1.25rem;
        grid-template-columns: 1fr auto;
    }

    .fk-nav__links {
        display: none;
    }

    .fk-nav__burger {
        display: flex;
    }
}