/* ============================================================
   Nangchen T Studio — Shared Site Header
   Used by all pages via <div data-site-header></div>
   See assets/js/site-header.js for the injected markup.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400..800&family=Cormorant+Garamond:ital,wght@0,500..700;1,500..600&family=Hanken+Grotesk:wght@300..800&family=Noto+Serif+Tibetan:wght@400;600&display=swap');

/* Local Tibetan display font — same file used elsewhere on the site */
@font-face {
    font-family: 'Shangshung';
    src: url('../fonts/ShangshungSgoba-Khyungpo.ttf') format('truetype');
    font-display: swap;
}

/* ---------- Wrapper ----------
   The wrapper carries its own dark background band so the
   header looks consistent across light + dark page themes. */
.site-header {
    position: relative;
    z-index: 50;
    background: #080B16;
    color: #EDEAE0;
    font-family: 'Hanken Grotesk', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.site-header *,
.site-header *::before,
.site-header *::after { box-sizing: border-box; }

.site-header a { color: inherit; text-decoration: none; }
.site-header button { font-family: inherit; cursor: pointer; }
.site-header img { display: block; max-width: 100%; }

.site-header .site-shell {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 clamp(20px, 5vw, 40px);
}

/* ---------- Nav row ---------- */
.site-header .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 22px;
    padding-bottom: 22px;
}

.site-header .nav-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}
.site-header .nav-brand img {
    height: 42px;
    width: auto;
}

.site-header .brand-title {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 600;
    font-size: 25px;
    letter-spacing: 0.005em;
    color: #F4F1E8;
    line-height: 1;
}
.site-header .brand-title .studio-gold {
    background: linear-gradient(115deg, #F4D27E, #D9A943 55%, #C98A2E);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-style: italic;
    font-weight: 600;
}
.site-header .brand-tib {
    font-family: 'Shangshung', 'Noto Serif Tibetan', serif;
    line-height: 1.6;
    font-size: 19px;
    margin-top: 3px;
    letter-spacing: 0.02em;
    background: linear-gradient(115deg, #F4D27E, #D9A943 55%, #C98A2E);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    width: fit-content;
}
.site-header .brand-tag {
    font-size: 8.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #A89668;
    font-weight: 600;
    margin-top: 3px;
}

/* ---------- Links ---------- */
.site-header .nav-links {
    display: flex;
    align-items: center;
    gap: 34px;
}
.site-header .nav-links a {
    color: rgba(237, 234, 224, 0.7);
    font-size: 14.5px;
    font-weight: 500;
    transition: color 0.2s;
}
.site-header .nav-links a:hover,
.site-header .nav-links a[aria-current="page"] {
    color: #F4F1E8;
}

/* ---------- Gold pill CTA ---------- */
.site-header .btn-gold {
    background: linear-gradient(180deg, #F0CC78, #D9A943);
    color: #1A1206;
    font-size: 14px;
    font-weight: 700;
    padding: 11px 22px;
    border-radius: 999px;
    white-space: nowrap;
    box-shadow: 0 8px 24px -8px rgba(227, 184, 90, 0.6);
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
    display: inline-block;
}
.site-header .btn-gold:hover {
    color: #1A1206;
    transform: translateY(-1px);
    box-shadow: 0 12px 30px -8px rgba(227, 184, 90, 0.75);
}

/* ---------- Glowing gold underline ---------- */
.site-header .nav-underline {
    padding: 0 clamp(20px, 5vw, 40px);
}
.site-header .nav-underline-inner {
    max-width: 1240px;
    margin: 0 auto;
    height: 1.5px;
    border-radius: 999px;
    background: linear-gradient(90deg, transparent, rgba(240, 204, 120, 0.9) 50%, transparent);
    box-shadow: 0 0 14px 1px rgba(240, 204, 120, 0.5);
}

/* ---------- Theme toggle (pill switch) ---------- */
.site-header .theme-toggle {
    width: 56px; height: 28px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #1a1e36, #0e1225);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.4), 0 1px 0 rgba(240,204,120,0.08);
    display: flex; align-items: center;
    padding: 3px;
    transition: background 0.4s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.4s;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}
.site-header .theme-toggle::before {
    content: '';
    width: 22px; height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #F4D27E, #D9A943);
    box-shadow: 0 2px 6px rgba(217,169,67,0.5);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.4s, box-shadow 0.4s;
    transform: translateX(0);
    z-index: 1;
}
.site-header .theme-toggle:hover::before {
    box-shadow: 0 2px 10px rgba(217,169,67,0.7);
}
.site-header .theme-toggle:active::before {
    width: 26px;
    border-radius: 11px;
}
.site-header .theme-toggle svg {
    position: absolute;
    width: 14px; height: 14px;
    fill: currentColor;
    transition: opacity 0.3s, transform 0.3s;
}
.site-header .theme-toggle .theme-icon-sun {
    left: 7px;
    color: rgba(240,204,120,0.3);
}
.site-header .theme-toggle .theme-icon-moon {
    right: 7px;
    color: rgba(240,204,120,0.7);
}

/* ---------- LIGHT MODE — header ---------- */
html:not(.dark) .site-header {
    background: #F8F7F3;
    color: #1A1B26;
}
html:not(.dark) .site-header .brand-title {
    color: #1A1B26;
}
html:not(.dark) .site-header .brand-title .studio-gold {
    background: linear-gradient(115deg, #1C3FB0, #001E40);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
html:not(.dark) .site-header .brand-tib {
    background: linear-gradient(115deg, #1C3FB0, #001E40);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
html:not(.dark) .site-header .brand-tag {
    color: #5A6070;
}
html:not(.dark) .site-header .nav-links a {
    color: rgba(26,27,38,0.6);
}
html:not(.dark) .site-header .nav-links a:hover,
html:not(.dark) .site-header .nav-links a[aria-current="page"] {
    color: #1A1B26;
}
html:not(.dark) .site-header .nav-links .btn-gold,
html:not(.dark) .site-header .btn-gold {
    background: linear-gradient(180deg, #1C3FB0, #001E40);
    color: #fff;
    box-shadow: 0 8px 24px -8px rgba(0,30,64,0.35);
}
html:not(.dark) .site-header .nav-links .btn-gold:hover,
html:not(.dark) .site-header .btn-gold:hover {
    color: #fff;
    box-shadow: 0 12px 30px -8px rgba(0,30,64,0.5);
}
html:not(.dark) .site-header .nav-underline-inner {
    background: linear-gradient(90deg, transparent, rgba(0,30,64,0.25) 50%, transparent);
    box-shadow: none;
}
html:not(.dark) .site-header .theme-toggle {
    background: linear-gradient(135deg, #dce4f8, #c5d0ec);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1), 0 1px 0 rgba(255,255,255,0.6);
}
html:not(.dark) .site-header .theme-toggle::before {
    background: linear-gradient(135deg, #1C3FB0, #001E40);
    box-shadow: 0 2px 6px rgba(0,30,64,0.4);
    transform: translateX(28px);
}
html:not(.dark) .site-header .theme-toggle:hover::before {
    box-shadow: 0 2px 10px rgba(0,30,64,0.6);
}
html:not(.dark) .site-header .theme-toggle .theme-icon-sun {
    color: rgba(28,63,176,0.7);
}
html:not(.dark) .site-header .theme-toggle .theme-icon-moon {
    color: rgba(28,63,176,0.3);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .site-header .nav-links { gap: 18px; }
    .site-header .nav-links .desk-only { display: none; }
}
@media (max-width: 540px) {
    .site-header .brand-tag { display: none; }
    .site-header .nav-brand img { height: 36px; }
    .site-header .brand-title { font-size: 21px; }
    .site-header .brand-tib { font-size: 16px; }
}