/* ── Header ─────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-header-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
}

/* Logo */
.site-logo {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -0.5px;
    text-decoration: none;
    flex-shrink: 0;
    white-space: nowrap;
}
.site-logo .logo-accent {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary, var(--color-primary)));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Search */
.header-search {
    flex: 1;
    max-width: 360px;
}
.header-search form {
    position: relative;
    display: flex;
    align-items: center;
}
.header-search input {
    width: 100%;
    padding: 9px 40px 9px 16px;
    border-radius: 999px;
    background: var(--color-surface-alt, var(--color-surface));
    border: 1.5px solid var(--color-border);
    color: var(--color-text);
    font-family: var(--font-heading);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.header-search input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}
.header-search input::placeholder { color: var(--color-text-muted); }
.header-search button {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}
.header-search button:hover { color: var(--color-primary); }

/* Nav */
.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}
.header-nav a,
.header-nav button.nav-link {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 8px;
    border: none;
    background: none;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
}
.header-nav a:hover,
.header-nav button.nav-link:hover {
    color: var(--color-text);
    background: var(--color-hover-bg);
}
.header-nav a.nav-active {
    color: var(--color-primary);
    font-weight: 600;
}
.nav-auth-btn {
    font-family: var(--font-heading) !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    color: var(--color-primary) !important;
    border: 1.5px solid var(--color-primary) !important;
    padding: 6px 14px !important;
    border-radius: 8px !important;
    text-decoration: none;
    transition: background 0.2s, color 0.2s !important;
}
.nav-auth-btn:hover {
    background: var(--color-primary) !important;
    color: #fff !important;
}

/* Divider */
.nav-divider {
    width: 1px;
    height: 20px;
    background: var(--color-border);
    margin: 0 4px;
}

/* Icon buttons */
.header-icon-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s, background 0.2s;
    flex-shrink: 0;
}
.header-icon-btn:hover {
    color: var(--color-text);
    background: var(--color-hover-bg);
}
.header-icon-btn .icon-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    font-family: var(--font-heading);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    box-shadow: 0 0 0 2px var(--color-header-bg);
}
.header-icon-btn .icon-badge[data-count="0"] { display: none; }

/* Theme picker */
.theme-picker { position: relative; }
.theme-picker-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: none;
    background: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
}
.theme-picker-btn:hover {
    color: var(--color-text);
    background: var(--color-hover-bg);
}
.theme-picker-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.2);
    padding: 6px;
    min-width: 148px;
    z-index: 9999;
}
.theme-picker-menu.open { display: block; }
.theme-opt {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: none;
    color: var(--color-text-secondary);
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    text-align: left;
}
.theme-opt:hover { background: var(--color-hover-bg); color: var(--color-text); }
.theme-opt.active { color: var(--color-primary); font-weight: 700; background: var(--color-accent-light); }

/* Mobile hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 8px;
    color: var(--color-text);
    transition: background 0.2s;
}
.hamburger:hover { background: var(--color-hover-bg); }
.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all 0.3s;
    transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile drawer */
.mobile-nav {
    display: none;
    flex-direction: column;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    padding: 12px 24px 20px;
    gap: 4px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a,
.mobile-nav button {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
    border: none;
    background: none;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    text-align: left;
    width: 100%;
}
.mobile-nav a:hover,
.mobile-nav button:hover {
    background: var(--color-hover-bg);
    color: var(--color-text);
}
.mobile-nav .mobile-divider {
    height: 1px;
    background: var(--color-border);
    margin: 6px 0;
}
.mobile-nav .mobile-auth {
    color: var(--color-primary) !important;
    font-weight: 600 !important;
    border: 1.5px solid var(--color-primary) !important;
    text-align: center !important;
    margin-top: 6px;
}
.mobile-nav .mobile-auth:hover {
    background: var(--color-primary) !important;
    color: #fff !important;
}
.mobile-icons-row {
    display: flex;
    gap: 12px;
    padding: 6px 12px;
    margin-top: 4px;
}
.mobile-icons-row a {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    padding: 8px 12px;
    flex: 1;
    justify-content: center;
    border: 1px solid var(--color-border);
}

@media (max-width: 900px) {
    .header-search { display: none; }
}
@media (max-width: 768px) {
    .header-nav { display: none; }
    .hamburger { display: flex; }
}