/* ==================== Reset & Base ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #0f2440;
    --color-accent: #3182ce;
    --color-success: #38a169;
    --color-danger: #e53e3e;
    --color-warning: #d69e2e;
    --color-bg: #f7fafc;
    --color-surface: #ffffff;
    --color-text: #1a202c;
    --color-text-secondary: #718096;
    --color-border: #e2e8f0;
    --color-hover: #edf2f7;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 48px;
    --toc-width: 240px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
}

html { font-size: 15px; }
body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
}

/* ==================== Login ==================== */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.login-card {
    background: var(--color-surface);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.login-header p {
    color: var(--color-text-secondary);
}

.login-error {
    color: var(--color-danger);
    text-align: center;
    margin-bottom: 10px;
    min-height: 20px;
}

/* ==================== App Layout ==================== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ==================== Sidebar ==================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--color-primary-dark);
    color: #cbd5e0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: width 0.25s ease, min-width 0.25s ease;
}

/* Collapse toggle button */
.sidebar-collapse-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.5);
    cursor: pointer;
    padding: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
    flex-shrink: 0;
}
.sidebar-collapse-btn:hover {
    color: white;
    background: rgba(255,255,255,0.1);
}

/* Collapsed sidebar */
.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
    min-width: var(--sidebar-collapsed-width);
    overflow: hidden;
}
.sidebar.collapsed .sidebar-header .user-info,
.sidebar.collapsed .sidebar-search,
.sidebar.collapsed .sidebar-nav,
.sidebar.collapsed .sidebar-footer {
    opacity: 0;
    visibility: hidden;
    height: 0;
    overflow: hidden;
    padding: 0;
    margin: 0;
}
.sidebar.collapsed .sidebar-header {
    padding: 8px;
    display: flex;
    justify-content: center;
    border-bottom: none;
}
.sidebar.collapsed .sidebar-collapse-btn svg {
    transform: rotate(180deg);
}


.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.user-info { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; }

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-name { font-weight: 600; color: white; }

.sidebar-search { padding: 12px 16px; }

.search-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 6px;
    background: rgba(255,255,255,0.1);
    color: white;
    font-size: 0.85rem;
}

.search-input::placeholder { color: rgba(255,255,255,0.5); }
.search-input:focus { outline: none; border-color: var(--color-accent); }

.sidebar-nav { flex: 1; padding: 8px 0; overflow-y: auto; }

.home-link {
    margin-bottom: 4px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-weight: 500;
}

.nav-section { margin-bottom: 8px; }

.nav-section-header {
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-section-header h3 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255,255,255,0.4);
    font-weight: 600;
}

.nav-list { list-style: none; }

.nav-item {
    display: block;
    padding: 8px 16px;
    color: #cbd5e0;
    text-decoration: none;
    font-size: 0.85rem;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s;
}

.nav-item:hover {
    background: rgba(255,255,255,0.08);
    color: white;
}

.nav-item.active {
    background: rgba(255,255,255,0.12);
    color: white;
    border-left-color: var(--color-accent);
}

.nav-item.user-role {
    font-weight: 600;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.settings-btn {
    width: 100%;
    padding: 8px;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 6px;
    color: #cbd5e0;
    cursor: pointer;
    font-size: 0.85rem;
}

.settings-btn:hover { background: rgba(255,255,255,0.08); color: white; }

/* ==================== Main Content ==================== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 30px 40px;
    max-width: 1200px;
    min-height: 100vh;
    transition: margin-left 0.25s ease;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

.view-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--color-border);
}

.view-header h1 {
    font-size: 1.6rem;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.view-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

/* ==================== Loading & Empty ==================== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.error-message {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-danger);
    font-size: 1rem;
}

/* ==================== Mobile Header ==================== */
.mobile-header {
    display: none;
    background: var(--color-primary);
    color: white;
    padding: 12px 16px;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.hamburger-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hamburger-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: white;
}

.mobile-title { font-size: 1.1rem; font-weight: 600; }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.sidebar-overlay.visible { display: block; }

/* ==================== Print ==================== */
@media print {
    .sidebar, .mobile-header, .sidebar-overlay, .sop-actions,
    .sop-action-bar, .view-header button, .breadcrumb { display: none !important; }
    .main-content { margin-left: 0; padding: 0; }
    .manual-toc { display: none; }
    .manual-content { margin-left: 0; }
    .sop-article { page-break-inside: avoid; }
}