/*
 * SnapBrainy Header + Mobile Drawer
 * Sticky header, desktop nav, mobile hamburger, slide-in drawer.
 */

/* ═══════════════════════════════════════════
   HEADER
═══════════════════════════════════════════ */

.sb-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--sb-z-header);
    height: var(--sb-header-h);
    background: rgba(245,244,239,0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-divider);
    transition: border-color var(--sb-duration) var(--sb-ease),
                background var(--sb-duration) var(--sb-ease),
                box-shadow var(--sb-duration) var(--sb-ease),
                transform 300ms var(--sb-ease);
}

/* Scrolled state — JS adds .is-scrolled */
.sb-header.is-scrolled {
    border-color: var(--color-divider);
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    background: rgba(245,244,239,0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

/* Smart-sticky: JS adds .is-hidden when scrolling down on landing pages */
.sb-header.is-hidden {
    transform: translateY(-100%);
}

/* ── Dark-hero pages: transparent header on load, solid after scroll ──
   Used by: product landing pages (sb-landing) + home page (sb-dark-hero)  */

.sb-landing .sb-header,
.sb-dark-hero .sb-header {
    background: transparent;
    border-color: transparent;
    box-shadow: none;
}

.sb-landing .sb-header .sb-header-logo,
.sb-landing .sb-header .sb-header-nav a,
.sb-landing .sb-header .sb-header-icon,
.sb-dark-hero .sb-header .sb-header-logo,
.sb-dark-hero .sb-header .sb-header-nav a,
.sb-dark-hero .sb-header .sb-header-icon {
    color: #ffffff;
}

/* Logo image — invert to white on transparent dark headers */
.sb-landing .sb-header .sb-logo-img,
.sb-dark-hero .sb-header .sb-logo-img {
    filter: brightness(0) invert(1);
}

/* Once scrolled — opaque solid header */
.sb-landing .sb-header.is-scrolled,
.sb-dark-hero .sb-header.is-scrolled {
    background: rgba(245,244,239,0.96);
    border-color: var(--color-divider);
    box-shadow: var(--sb-shadow-sm);
}

.sb-landing .sb-header.is-scrolled .sb-header-logo,
.sb-landing .sb-header.is-scrolled .sb-header-nav a,
.sb-landing .sb-header.is-scrolled .sb-header-icon,
.sb-dark-hero .sb-header.is-scrolled .sb-header-logo,
.sb-dark-hero .sb-header.is-scrolled .sb-header-nav a,
.sb-dark-hero .sb-header.is-scrolled .sb-header-icon {
    color: var(--sb-ink);
}

/* Restore logo to natural colors once header is solid */
.sb-landing .sb-header.is-scrolled .sb-logo-img,
.sb-dark-hero .sb-header.is-scrolled .sb-logo-img {
    filter: none;
}

/* Dark mode toggle icons — show correct icon per theme state */
.sb-icon-moon { display: block; }
.sb-icon-sun  { display: none; }
[data-theme="dark"] .sb-icon-moon { display: none; }
[data-theme="dark"] .sb-icon-sun  { display: block; }

.sb-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sb-space-4);
    height: 100%;
    max-width: var(--sb-container);
    margin-inline: auto;
    padding-inline: var(--sb-container-px);
}

/* ── Logo ── */

.sb-header-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--sb-space-2);
    font-family: var(--sb-font-heading);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--sb-ink);
    letter-spacing: -0.03em;
    flex-shrink: 0;
    transition: opacity var(--sb-duration) var(--sb-ease);
    text-decoration: none;
}

.sb-header-logo:hover { opacity: 0.82; }

.sb-logo-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: block;
    flex-shrink: 0;
    transition: filter var(--sb-duration) var(--sb-ease);
}

.sb-logo-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
    line-height: 1;
}

/* Logo text white on transparent dark headers */
.sb-landing .sb-header .sb-logo-text,
.sb-dark-hero .sb-header .sb-logo-text { color: #ffffff; }

/* Restore to ink when header becomes opaque */
.sb-landing .sb-header.is-scrolled .sb-logo-text,
.sb-dark-hero .sb-header.is-scrolled .sb-logo-text { color: var(--color-text); }

/* Drawer logo */
.sb-drawer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--sb-space-2);
}

/* ── Desktop Navigation ── */

.sb-header-nav {
    display: none;
    align-items: center;
    gap: var(--sb-space-8);
}

.sb-header-nav a {
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0;
    padding: 6px 2px;
    position: relative;
    transition: color 160ms ease;
}

.sb-header-nav a:hover {
    color: var(--color-text);
}

/* Active indicator — Signal Teal underline (copper reserved for CTA) */
.sb-header-nav a[aria-current="page"],
.sb-header-nav a.current {
    color: var(--color-text);
    font-weight: 600;
}

.sb-header-nav a[aria-current="page"]::after,
.sb-header-nav a.current::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1.5px;
    background: var(--color-brand);
    border-radius: 1px;
}

/* ── Shop CTA — filled Electric Copper pill ── */
.sb-header-nav a.nav-cta {
    background: var(--color-cta);
    color: #ffffff;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.01em;
    margin-left: 6px;
    transition: background 180ms ease, transform 180ms ease, box-shadow 180ms ease, color 160ms ease;
}

.sb-header-nav a.nav-cta:hover {
    background: var(--color-cta-hover);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(184,94,31,0.30);
}

/* CTA pill: no underline indicator — fill is the active signal */
.sb-header-nav a.nav-cta::after,
.sb-header-nav a.nav-cta[aria-current="page"]::after,
.sb-header-nav a.nav-cta.current::after {
    display: none;
}

.sb-header-nav a.nav-cta[aria-current="page"],
.sb-header-nav a.nav-cta.current {
    background: var(--color-cta-hover);
    color: #ffffff;
    font-weight: 600;
}

@media (min-width: 900px) {
    .sb-header-nav {
        display: flex;
    }
    .sb-header {
        height: var(--sb-header-h-lg);
    }
}

/* ── Actions (icons + hamburger) ── */

.sb-header-actions {
    display: flex;
    align-items: center;
    gap: var(--sb-space-3);
    flex-shrink: 0;
}

.sb-header-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--sb-radius);
    color: var(--sb-ink);
    transition: background-color var(--sb-duration) var(--sb-ease),
                color var(--sb-duration) var(--sb-ease);
    position: relative;
}

.sb-header-icon:hover {
    background-color: rgba(17,19,24,0.06);
}

/* Account link — clean icon, no circle border */
.sb-header-icon[aria-label="Account"] {
    width: 34px;
    height: 34px;
    padding: 0;
    border: none;
    background: transparent;
}

.sb-header-icon[aria-label="Account"]:hover {
    background: transparent;
    color: var(--color-brand);
}

/* Global button transition */
.sb-btn, a.sb-btn, button { transition: background 160ms ease, box-shadow 160ms ease, color 160ms ease; }

/* Cart count badge */
.sb-cart-count {
    position: absolute;
    top: 2px;
    right: 2px;
    min-width: 18px;
    height: 18px;
    background: var(--color-gold);
    color: var(--color-surface-deep);
    font-size: 10px;
    font-weight: 800;
    border-radius: var(--sb-radius-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-inline: 4px;
    line-height: 1;
}

/* ── Hamburger button ── */

.sb-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: var(--sb-space-2);
    border-radius: var(--sb-radius);
    cursor: pointer;
    background: none;
    border: none;
    color: var(--color-text);
    transition: background-color var(--sb-duration) var(--sb-ease);
}

.sb-hamburger:hover {
    background-color: var(--sb-surface-2);
}

.sb-hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: currentColor;
    border-radius: 2px;
    transition: transform var(--sb-duration) var(--sb-ease),
                opacity var(--sb-duration) var(--sb-ease);
    transform-origin: center;
}

/* Hamburger → X when open */
.sb-hamburger[aria-expanded="true"] .sb-hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.sb-hamburger[aria-expanded="true"] .sb-hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.sb-hamburger[aria-expanded="true"] .sb-hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Hide hamburger on desktop */
@media (min-width: 900px) {
    .sb-hamburger {
        display: none;
    }
}

/* ═══════════════════════════════════════════
   DRAWER OVERLAY
═══════════════════════════════════════════ */

.sb-drawer-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--sb-z-overlay);
    background: rgba(10, 15, 30, 0.60);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--sb-duration-slow) var(--sb-ease);
}

.sb-drawer-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* ═══════════════════════════════════════════
   MOBILE DRAWER
═══════════════════════════════════════════ */

.sb-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: var(--sb-z-drawer);
    width: 100%;
    background: var(--color-surface-deep);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--sb-duration-slow) var(--sb-ease);
    overflow: hidden;
}

@media (min-width: 480px) {
    .sb-drawer { width: min(420px, 100%); }
}

.sb-drawer.is-open {
    transform: translateX(0);
}

/* Drawer head */
.sb-drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--sb-space-5) var(--sb-space-6);
    border-bottom: 1px solid var(--sb-border-dark);
    flex-shrink: 0;
}

.sb-drawer-logo {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.02em;
}

.sb-drawer-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--sb-radius);
    color: var(--sb-muted);
    transition: background-color var(--sb-duration) var(--sb-ease),
                color var(--sb-duration) var(--sb-ease);
}

.sb-drawer-close:hover {
    background: rgba(255,255,255,0.08);
    color: #ffffff;
}

/* Drawer body */
.sb-drawer-body {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;  /* prevent scroll from leaking to the page */
    padding: var(--sb-space-5) var(--sb-space-6);
    /* -webkit-overflow-scrolling:touch removed — creates a separate momentum
       scroll context that intercepts wheel events even when drawer is off-screen */
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.15) transparent;
}

/* ── Primary CTA — Electric Copper, first thing you see ── */
.sb-drawer-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    height: 52px;
    background: var(--color-cta);
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.01em;
    text-decoration: none;
    border-radius: var(--radius-full);
    margin-bottom: 28px;
    flex-shrink: 0;
    transition: background 180ms ease, transform 180ms ease;
}

.sb-drawer-cta svg { transition: transform 200ms var(--ease-out); }

.sb-drawer-cta:hover {
    background: var(--color-cta-hover);
    transform: translateY(-1px);
}

.sb-drawer-cta:hover svg { transform: translateX(3px); }

/* ── Main navigation links ── */
.sb-drawer-nav {
    display: flex;
    flex-direction: column;
    margin-bottom: 28px;
}

.sb-drawer-nav a {
    display: flex;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    font-family: var(--font-body);
    font-size: 17px;
    font-weight: 500;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    transition: color 160ms ease, padding-left 160ms ease;
}

.sb-drawer-nav a:first-child { border-top: 1px solid rgba(255,255,255,0.07); }

.sb-drawer-nav a:hover {
    color: #ffffff;
    padding-left: 8px;
}

/* ── Topics section ── */
.sb-drawer-section { margin-bottom: var(--sb-space-6); }

.sb-drawer-label {
    font-family: var(--font-body);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: rgba(255,255,255,0.28);
    margin: 0 0 12px;
}

/* 2-column topic grid */
.sb-drawer-topics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3px;
}

.sb-drawer-topics-grid a {
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    transition: background 160ms ease, color 160ms ease;
}

.sb-drawer-topics-grid a:hover {
    background: rgba(255,255,255,0.07);
    color: #ffffff;
}

/* Drawer footer */
.sb-drawer-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sb-space-4);
    padding: var(--sb-space-5) var(--sb-space-6);
    border-top: 1px solid var(--sb-border-dark);
    flex-shrink: 0;
}

.sb-drawer-footer a {
    font-size: var(--sb-text-sm);
    color: var(--sb-subtle);
    transition: color var(--sb-duration) var(--sb-ease);
}

.sb-drawer-footer a:hover {
    color: #ffffff;
}

.sb-drawer-footer span {
    color: var(--sb-subtle);
    font-size: var(--sb-text-sm);
}

/* ── Prevent body scroll when drawer open ── */
body.sb-drawer-open {
    overflow: hidden;
    touch-action: none;
}