/* ============================================
   SIDEBAR NAVIGATION - Боковой слайдер
   ============================================ */

/* Backdrop overlay */
.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 26, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.sidebar-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* Sidebar panel */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 320px;
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    z-index: 950;
    transform: translateX(-100%);
    transition: transform 300ms cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.sidebar.open {
    transform: translateX(0);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .sidebar.open {
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.4);
}

/* Sidebar header */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.sidebar-brand .prompt {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.2rem;
}

.sidebar-brand .brand-text {
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
}

.sidebar-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.sidebar-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.sidebar-close svg {
    width: 16px;
    height: 16px;
}

/* Navigation section */
.sidebar-nav {
    padding: 16px 12px;
    flex: 1;
}

.sidebar-section-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    padding: 8px 12px 6px;
    margin-top: 8px;
}

.sidebar-section-label:first-child {
    margin-top: 0;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    margin-bottom: 2px;
}

.sidebar-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-link.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}

.sidebar-link-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    opacity: 0.7;
}

.sidebar-link.active .sidebar-link-icon {
    opacity: 1;
}

.sidebar-link svg {
    width: 18px;
    height: 18px;
}

/* Sidebar footer — theme + api status */
.sidebar-footer {
    padding: 16px 16px 24px;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-footer .api-status {
    width: 100%;
    justify-content: flex-start;
    border-radius: 12px;
    padding: 10px 14px;
}

.sidebar-footer .theme-toggle {
    width: 100%;
    border-radius: 12px;
    justify-content: center;
}

/* ============================================
   HEADER BAR - Единая горизонтальная полоса
   ============================================ */

.header-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

/* Menu button — заметная кнопка с акцентом */
.header-bar-menu {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent);
    border: none;
    border-radius: 16px;
    cursor: pointer;
    color: white;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.header-bar-menu:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(217, 119, 87, 0.3);
}

.header-bar-menu:active {
    transform: scale(0.95);
}

.header-bar-menu svg {
    width: 24px;
    height: 24px;
}

/* Title — центральная часть */
.header-bar-title {
    flex: 1;
    display: flex;
    align-items: baseline;
    gap: 10px;
    min-width: 0;
}

.header-bar-page {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.header-bar-sep {
    color: var(--border-color);
    font-size: 1.1rem;
    font-weight: 300;
}

.header-bar-sub {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Logo — справа, крупный */
.header-bar-logo {
    display: inline-flex;
    align-items: center;
    gap: 0;
    font-family: var(--font-family);
    font-size: 1.65rem;
    font-weight: 500;
    text-decoration: none;
    letter-spacing: 0.5px;
    line-height: 1;
    color: var(--text-primary);
    transition: opacity 0.2s;
    flex-shrink: 0;
    white-space: nowrap;
}

.header-bar-logo:hover {
    opacity: 0.7;
}

.header-bar-logo .prompt {
    color: var(--accent);
    margin-right: 6px;
    font-weight: 700;
}

.header-bar-logo .logo-text {
    display: inline;
    white-space: nowrap;
}

.header-bar-logo .cursor {
    display: inline-block;
    margin-left: 2px;
    color: var(--accent);
    animation: logoBlink 0.8s step-end infinite;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .sidebar {
        width: 85vw;
        max-width: 320px;
    }

    .header-bar {
        padding: 12px 16px;
        gap: 12px;
    }

    .header-bar-menu {
        width: 40px;
        height: 40px;
    }

    .header-bar-sub {
        display: none;
    }

    .header-bar-sep {
        display: none;
    }

    .header-bar-page {
        font-size: 1.1rem;
    }

    .header-bar-logo {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 100vw;
        max-width: none;
    }

    .header-bar {
        padding: 10px 12px;
        gap: 10px;
        border-radius: var(--border-radius-sm);
    }

    .header-bar-menu {
        width: 36px;
        height: 36px;
        border-radius: 10px;
    }

    .header-bar-menu svg {
        width: 18px;
        height: 18px;
    }

    .header-bar-page {
        font-size: 1rem;
    }

    .header-bar-logo {
        font-size: 1.1rem;
    }
}