/* =====================================================
   App Header
   ===================================================== */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h, 60px);
    background: var(--c-surface, #fff);
    border-bottom: 1px solid var(--c-border, #E5E7EB);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.app-header__inner {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Logo */
.app-header__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    text-decoration: none;
}

.app-header__logo-mark {
    width: 32px;
    height: 32px;
    background: var(--c-accent, #3B82F6);
    color: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 17px;
    font-weight: 700;
    font-style: italic;
    flex-shrink: 0;
    user-select: none;
}

.app-header__logo-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--c-text, #111827);
    letter-spacing: -0.01em;
    white-space: nowrap;
}

/* Search */
.app-header__search {
    flex: 1;
    max-width: 500px;
    position: relative;
    display: flex;
    align-items: center;
}

.app-header__search-icon {
    position: absolute;
    left: 12px;
    width: 16px;
    height: 16px;
    color: var(--c-text-3, #9CA3AF);
    pointer-events: none;
    flex-shrink: 0;
}

.app-header__search-input {
    width: 100%;
    height: 38px;
    padding: 0 36px 0 36px;
    border: 1px solid var(--c-border, #E5E7EB);
    border-radius: 100px;
    font-size: 14px;
    font-family: inherit;
    color: var(--c-text, #111827);
    background: var(--c-bg, #F9FAFB);
    transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
    -webkit-appearance: none;
    appearance: none;
}

.app-header__search-input::placeholder {
    color: var(--c-text-3, #9CA3AF);
}

.app-header__search-input:focus {
    outline: none;
    border-color: var(--c-accent, #3B82F6);
    background: var(--c-surface, #fff);
    box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}

/* Hide native clear button in WebKit */
.app-header__search-input::-webkit-search-cancel-button { display: none; }

.app-header__search-kbd {
    position: absolute;
    right: 12px;
    font-size: 11px;
    font-family: inherit;
    color: var(--c-text-3, #9CA3AF);
    background: var(--c-border-light, #F3F4F6);
    border: 1px solid var(--c-border, #E5E7EB);
    border-radius: 4px;
    padding: 1px 5px;
    pointer-events: none;
    line-height: 1.6;
    transition: opacity 0.18s;
}

.app-header__search-input:focus ~ .app-header__search-kbd {
    opacity: 0;
}

/* Actions */
.app-header__actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex-shrink: 0;
}

/* Language dropdown */
.app-header__lang {
    position: relative;
}

.app-header__lang-btn {
    height: 34px;
    padding: 0 10px;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-2, #6B7280);
    background: transparent;
    border: 1px solid var(--c-border, #E5E7EB);
    border-radius: 100px;
    cursor: pointer;
    transition: color 0.18s, border-color 0.18s, background 0.18s;
    white-space: nowrap;
}

.app-header__lang-btn:hover {
    color: var(--c-text, #111827);
    border-color: var(--c-text-2, #6B7280);
}

.app-header__lang-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 140px;
    background: var(--c-surface, #fff);
    border: 1px solid var(--c-border, #E5E7EB);
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0,0,0,.10);
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 0.16s, transform 0.16s;
    z-index: 100;
}

.app-header__lang-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.app-header__lang-option {
    display: block;
    width: 100%;
    padding: 9px 14px;
    text-align: left;
    font-size: 14px;
    color: var(--c-text, #111827);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 0.14s;
}

.app-header__lang-option:hover { background: var(--c-bg, #F9FAFB); }

.app-header__lang-option.is-active {
    font-weight: 600;
    color: var(--c-accent, #3B82F6);
    background: var(--c-accent-bg, #EFF6FF);
}

/* Theme toggle */
.app-header__theme-btn {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--c-border, #E5E7EB);
    border-radius: 50%;
    cursor: pointer;
    color: var(--c-text-2, #6B7280);
    transition: color 0.18s, border-color 0.18s, background 0.18s;
    flex-shrink: 0;
}

.app-header__theme-btn:hover {
    color: var(--c-text, #111827);
    border-color: var(--c-text-2, #6B7280);
}

.app-header__theme-icon {
    width: 16px;
    height: 16px;
}

/* Responsive */
@media (max-width: 768px) {
    .app-header__inner { padding: 0 16px; gap: 12px; }
    .app-header__logo-text { display: none; }
    .app-header__search { max-width: none; }
    .app-header__search-kbd { display: none; }
}

@media (max-width: 400px) {
    .app-header__lang-btn span { display: none; }
}