/* ============================================================
   BASE — biến màu, reset, layout khung (sidebar + main)
   ============================================================ */
:root[data-theme="dark"] {
    --bg-primary: #0a0e1a;
    --bg-secondary: #121a2e;
    --bg-card: #182342;
    --bg-elevated: #1e2a4a;
    --text-main: #eef2ff;
    --text-muted: #8b96b8;
    --accent: #38bdf8;
    --accent-2: #818cf8;
    --accent-glow: rgba(56, 189, 248, 0.16);
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-color: rgba(255, 255, 255, 0.06);
    --sidebar-width: 68px;
    --sidebar-expand: 250px;
    --modal-bg: rgba(4, 8, 20, 0.75);
    --shadow-soft: 0 4px 24px rgba(0,0,0,0.25);
}
:root[data-theme="light"] {
    --bg-primary: #f4f6fb;
    --bg-secondary: #ffffff;
    --bg-card: #f1f4fa;
    --bg-elevated: #e9edf7;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent: #0284c7;
    --accent-2: #6366f1;
    --accent-glow: rgba(2, 132, 199, 0.10);
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --border-color: rgba(15, 23, 42, 0.08);
    --sidebar-width: 68px;
    --sidebar-expand: 250px;
    --modal-bg: rgba(15, 23, 42, 0.45);
    --shadow-soft: 0 4px 24px rgba(15,23,42,0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; }
html, body { height: 100%; }
body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app-shell { display: none; }

/* ---------- Sidebar ---------- */
.sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-width);
    background-color: var(--bg-secondary); border-right: 1px solid var(--border-color);
    z-index: 150; overflow: hidden; display: flex; flex-direction: column;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Mặc định: tự thu gọn, mở rộng khi rê chuột vào (desktop). Nếu đã GHIM (.pinned)
   thì luôn mở rộng bất kể có đang hover hay không. */
.sidebar:hover, .sidebar.pinned { width: var(--sidebar-expand); box-shadow: 10px 0 30px rgba(0,0,0,0.2); }

.sidebar-brand { padding: 24px 20px; display: flex; align-items: center; gap: 12px; }
.brand-icon { font-size: 26px; color: var(--accent); flex-shrink: 0; }
.brand-text { font-family: 'Orbitron', sans-serif; font-weight: bold; font-size: 16px; opacity: 0; white-space: nowrap; transition: opacity 0.2s; letter-spacing: 1px; flex-grow: 1; }
.sidebar:hover .brand-text, .sidebar.pinned .brand-text, .sidebar.mobile-open .brand-text { opacity: 1; }

/* ---------- Nút Ghim (Pin) sidebar — người dùng tự chọn luôn mở rộng hay tự ẩn/hiện khi rê chuột ---------- */
.sidebar-pin-btn {
    background: none; border: none; color: var(--text-muted); font-size: 18px; cursor: pointer;
    display: flex; align-items: center; justify-content: center; width: 28px; height: 28px;
    border-radius: 8px; flex-shrink: 0; opacity: 0; transition: opacity 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.sidebar:hover .sidebar-pin-btn, .sidebar.pinned .sidebar-pin-btn, .sidebar.mobile-open .sidebar-pin-btn { opacity: 1; }
.sidebar-pin-btn:hover { background: var(--accent-glow); color: var(--accent); }
.sidebar-pin-btn i { transition: transform 0.2s ease; display: block; }
.sidebar.pinned .sidebar-pin-btn { color: var(--accent); }
.sidebar.pinned .sidebar-pin-btn i { transform: rotate(45deg); }

.sidebar-menu { display: flex; flex-direction: column; gap: 6px; padding: 10px; flex-grow: 1; }
.menu-item { display: flex; align-items: center; gap: 20px; padding: 13px 14px; border-radius: 12px; color: var(--text-muted); text-decoration: none; white-space: nowrap; }
.menu-item i { font-size: 21px; flex-shrink: 0; }
.menu-text { opacity: 0; transition: opacity 0.2s; font-size: 14px; font-weight: 500; }
.sidebar:hover .menu-text, .sidebar.pinned .menu-text, .sidebar.mobile-open .menu-text { opacity: 1; }
.menu-item:hover, .menu-item.active { background-color: var(--accent-glow); color: var(--accent); }
.sidebar-footer { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.btn-theme, .btn-user-name {
    background: none; border: none; color: var(--text-muted); font-size: 21px; cursor: pointer;
    display: flex; align-items: center; gap: 15px; padding: 13px 14px; border-radius: 12px; white-space: nowrap;
}
.btn-theme:hover { background: var(--accent-glow); color: var(--accent); }

/* ---------- Nút mở menu trên di động (hamburger) — ẩn trên desktop ---------- */
.mobile-sidebar-toggle {
    display: none; align-items: center; justify-content: center; width: 40px; height: 40px;
    border-radius: 10px; border: 1px solid var(--border-color); background: var(--bg-secondary);
    color: var(--text-main); font-size: 20px; cursor: pointer; flex-shrink: 0;
}
.mobile-sidebar-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* Lớp phủ tối phía sau sidebar khi mở trên di động */
.sidebar-overlay {
    position: fixed; inset: 0; background: rgba(4, 8, 20, 0.55); z-index: 140;
    opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
}
.sidebar-overlay.is-visible { opacity: 1; pointer-events: auto; }

/* ---------- Main ---------- */
.main-container { margin-left: var(--sidebar-width); width: calc(100% - var(--sidebar-width)); min-height: 100vh; padding: 28px 30px 60px; }
.main-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 26px; flex-wrap: wrap; gap: 12px; }
.main-header-left { display: flex; align-items: center; gap: 14px; }
.page-title { font-family: 'Orbitron', sans-serif; font-size: 21px; font-weight: 700; color: var(--text-main); }
.page-subtitle { font-size: 13px; color: var(--text-muted); margin-top: 2px; font-family: 'Inter', sans-serif; font-weight: 400; }

.app-view { display: none; }
.app-view.active { display: block; animation: fadeIn 0.35s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- User profile badge (header) — hiển thị người dùng Google đang đăng nhập ---------- */
.user-profile-badge { display: flex; align-items: center; gap: 10px; }
.user-profile-badge img { width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--border-color); }
.user-profile-badge .upb-text { display: flex; flex-direction: column; line-height: 1.3; }
.user-profile-badge .upb-name { font-weight: 600; color: var(--text-main); font-size: 12.5px; }
.user-profile-badge .upb-email { color: var(--text-muted); font-size: 11px; }

@media (max-width: 992px) { .calendar-grid { grid-auto-rows: minmax(84px, auto); } }
@media (max-width: 768px) {
    .sidebar { width: 0; border-right: none; }
    /* Trên di động không có hover, sidebar chỉ mở khi GHIM (pinned, ghi nhớ lần sau)
       hoặc khi bấm nút hamburger để mở tạm thời (mobile-open, không ghi nhớ). */
    .sidebar.pinned, .sidebar.mobile-open {
        width: var(--sidebar-expand); border-right: 1px solid var(--border-color);
        box-shadow: 10px 0 30px rgba(0,0,0,0.25);
    }
    .main-container { margin-left: 0; width: 100%; padding: 16px 14px 50px; }
    .user-profile-badge .upb-email { display: none; }
    .mobile-sidebar-toggle { display: flex; }
}
@media (min-width: 769px) {
    .sidebar-overlay { display: none; }
}