/**
 * Purbodix 2.0 — Header Styles
 * Topbar + Navbar + Search bar + Mobile drawer
 * Per UI.md Section B.1 and B.2 spec
 */

/* ═══════════════════════════════════════════════════════════════════
   TOP BAR (Desktop only)
   ═══════════════════════════════════════════════════════════════════ */
.topbar {
    background: var(--color-brand-dark);
    height: var(--topbar-height);
    display: none;
}

@media (min-width: 1024px) {
    .topbar {
        display: block;
    }
}

.topbar__inner {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--space-3);
}

.topbar__date {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    white-space: nowrap;
    flex-shrink: 0;
}

.topbar__ticker {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    overflow: hidden;
}

.topbar__ticker-label {
    background: var(--color-breaking);
    color: white;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.topbar__ticker-text {
    color: white;
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar__actions {
    display: flex;
    gap: var(--space-1);
    flex-shrink: 0;
}

.topbar__btn {
    color: rgba(255, 255, 255, 0.7);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}
.topbar__btn:hover {
    color: white;
}

/* ═══════════════════════════════════════════════════════════════════
   MAIN NAVBAR
   ═══════════════════════════════════════════════════════════════════ */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-white);
}

.navbar {
    background: var(--color-white);
    border-bottom: 3px solid var(--color-brand);
    height: var(--header-height);
    transition: all var(--transition-default);
}

/* Sticky scroll state */
.navbar--scrolled {
    box-shadow: var(--shadow-header);
    height: 52px;
}

.navbar__inner {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--space-3);
}

/* ─── Logo ────────────────────────────────────────────────────────── */
.navbar__logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.navbar__logo-text {
    font-family: var(--font-bengali);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-brand);
    line-height: 1;
}

.navbar__logo-sub {
    font-family: var(--font-english);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--color-brand-dark);
    text-transform: uppercase;
}

/* Mobile: center logo */
@media (max-width: 1023px) {
    .navbar__inner {
        justify-content: space-between;
    }
    .navbar__logo {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }
    .navbar {
        background: var(--color-brand-dark);
        border-bottom: none;
    }
    .navbar__logo-text {
        color: white;
        font-size: 20px;
    }
    .navbar__logo-sub {
        color: rgba(255, 255, 255, 0.7);
        font-size: 8px;
    }
}

/* ─── Hamburger (Mobile) ──────────────────────────────────────────── */
.navbar__hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

@media (min-width: 1024px) {
    .navbar__hamburger { display: none; }
}

.navbar__hamburger-line {
    width: 22px;
    height: 2px;
    background: white;
    border-radius: 2px;
    transition: all var(--transition-spring);
}

/* Hamburger → X animation */
.navbar__hamburger--open .navbar__hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.navbar__hamburger--open .navbar__hamburger-line:nth-child(2) {
    opacity: 0;
}
.navbar__hamburger--open .navbar__hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ─── Desktop Navigation Links ────────────────────────────────────── */
.navbar__nav {
    display: none;
    list-style: none;
    gap: 0;
    flex: 1;
}

@media (min-width: 1024px) {
    .navbar__nav {
        display: flex;
        align-items: center;
    }
}

.navbar__link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 14px;
    height: var(--header-height);
    font-family: var(--font-english);
    font-size: 15px;
    font-weight: 600;
    color: var(--color-black);
    text-decoration: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -3px;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.navbar__link:hover {
    color: var(--color-brand);
}

.navbar__link--active {
    color: var(--color-brand);
    border-bottom-color: var(--color-brand);
}

/* ─── Dropdown ────────────────────────────────────────────────────── */
.navbar__dropdown {
    position: relative;
}

.navbar__dropdown-trigger {
    cursor: pointer;
}
.navbar__dropdown-trigger svg {
    transition: transform var(--transition-fast);
}

.navbar__dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: var(--color-white);
    border-top: 3px solid var(--color-brand);
    box-shadow: var(--shadow-modal);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    padding: var(--space-1) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.navbar__dropdown:hover .navbar__dropdown-menu,
.navbar__dropdown-menu--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.navbar__dropdown:hover .navbar__dropdown-trigger svg {
    transform: rotate(180deg);
}

.navbar__dropdown-menu a {
    display: block;
    padding: 10px 20px;
    font-size: var(--size-sm);
    color: var(--color-black);
    transition: background var(--transition-fast);
}
.navbar__dropdown-menu a:hover {
    background: var(--color-brand-light);
    color: var(--color-brand);
}

.navbar__dropdown-divider {
    height: 1px;
    background: var(--color-brand-light);
    margin: var(--space-1) 0;
}

/* ─── Search Button (Desktop) ─────────────────────────────────────── */
.navbar__search-btn {
    width: 40px;
    height: 40px;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--color-brand);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
    margin-left: auto;
}
.navbar__search-btn:hover {
    background: var(--color-brand-light);
}

@media (min-width: 1024px) {
    .navbar__search-btn { display: flex; }
}

/* Mobile search button */
@media (max-width: 1023px) {
    #navbar-search-btn {
        display: flex;
        color: white;
        margin-left: auto;
    }
}

/* ═══════════════════════════════════════════════════════════════════
   MOBILE DRAWER
   ═══════════════════════════════════════════════════════════════════ */
.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-default);
}
.drawer-overlay--open {
    opacity: 1;
    visibility: visible;
}

.drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: min(85vw, 320px);
    height: 100vh;
    background: var(--color-white);
    z-index: var(--z-drawer);
    transform: translateX(-100%);
    transition: transform var(--transition-spring);
    overflow-y: auto;
}
.drawer--open {
    transform: translateX(0);
}

.drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-brand-light);
}

.drawer__title {
    font-family: var(--font-bengali);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-brand);
}

.drawer__close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--color-muted);
    border-radius: var(--radius-md);
}
.drawer__close:hover {
    background: var(--color-brand-light);
}

.drawer__nav {
    padding: var(--space-1) 0;
}

.drawer__link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-english);
    font-size: 16px;
    font-weight: 500;
    color: var(--color-black);
    border-bottom: 1px solid var(--color-brand-light);
    transition: all var(--transition-fast);
}
.drawer__link:hover {
    background: var(--color-brand-light);
    color: var(--color-brand);
}
.drawer__link--active {
    border-left: 4px solid var(--color-brand);
    background: var(--color-brand-light);
    color: var(--color-brand);
    font-weight: 600;
}

.drawer__icon {
    font-size: 18px;
}

.drawer__divider {
    height: 8px;
    background: var(--color-brand-light);
}

/* ═══════════════════════════════════════════════════════════════════
   EXPANDABLE SEARCH BAR
   ═══════════════════════════════════════════════════════════════════ */
.search-bar {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-header);
    padding: var(--space-2) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}
.search-bar--open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-bar__inner {
    display: flex;
    gap: var(--space-1);
    align-items: center;
}

.search-bar__form {
    flex: 1;
    display: flex;
}

.search-bar__input {
    flex: 1;
    height: 48px;
    padding: 0 var(--space-2);
    border: 2px solid var(--color-brand);
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    font-size: var(--size-body);
    background: var(--color-surface);
}
.search-bar__input:focus {
    outline: none;
    background: var(--color-white);
}

.search-bar__submit {
    width: 48px;
    height: 48px;
    background: var(--color-brand);
    color: white;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}
.search-bar__submit:hover {
    background: var(--color-brand-dark);
}

.search-bar__close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-muted);
    font-size: 18px;
}