:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --sidebar-width: 260px;
    --header-height: 64px;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

/* Light Mode */
[data-theme="light"] {
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #1e1b4b;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --bg-input: #f1f5f9;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #0c0a1d;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --bg-input: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0; top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    padding: 20px 0;
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 0 20px 30px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 20px;
}

.sidebar-brand h2 {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
}

.sidebar-brand small {
    color: rgba(255,255,255,0.6);
    font-size: 0.75rem;
}

.nav-menu { list-style: none; padding: 0 12px; }

.nav-menu li { margin-bottom: 4px; }

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.nav-menu a:hover, .nav-menu a.active {
    background: rgba(99,102,241,0.3);
    color: #fff;
}

.nav-menu a.active { background: var(--primary); }

.nav-menu a i { font-size: 1.1rem; width: 20px; text-align: center; }

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    z-index: 100;
}

.header-left { display: flex; align-items: center; gap: 16px; }

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.4rem;
    cursor: pointer;
}

.header-right { display: flex; align-items: center; gap: 16px; }

.theme-toggle {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text);
    width: 40px; height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.2s;
}

.theme-toggle:hover { background: var(--primary); color: #fff; }

.user-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px;
    background: var(--bg-input);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Page Content */
.page-content { padding: 30px; }

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: all 0.2s;
}

.card:hover { box-shadow: var(--shadow-lg); }

.card-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-weight: 600;
}

/* Grid */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Stat Cards */
.stat-card { text-align: center; }
.stat-value { font-size: 2rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
.stat-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-top: 6px;
}
.badge-danger { background: rgba(239,68,68,0.1); color: var(--danger); }
.badge-success { background: rgba(16,185,129,0.1); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.1); color: var(--warning); }
.badge-info { background: rgba(59,130,246,0.1); color: var(--info); }

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-fill.green { background: var(--success); }
.progress-fill.blue { background: var(--info); }
.progress-fill.orange { background: var(--warning); }
.progress-fill.red { background: var(--danger); }
.progress-fill.purple { background: var(--primary); }

/* Checklist */
.checklist-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 8px;
    background: var(--bg-input);
    cursor: pointer;
    transition: all 0.2s;
}

.checklist-item:hover { transform: translateX(4px); }

.checklist-item.done {
    background: rgba(16,185,129,0.1);
    text-decoration: line-through;
    opacity: 0.7;
}

.checklist-item input[type="checkbox"] {
    width: 20px; height: 20px;
    accent-color: var(--success);
    cursor: pointer;
}

/* Table */
.table-container { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
}

tr:hover td { background: var(--bg-input); }

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

/* Forms */
.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Meal Card */
.meal-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-input);
    border-radius: 10px;
    margin-bottom: 12px;
}

.meal-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    min-width: 50px;
}

.meal-info { flex: 1; }
.meal-info h4 { font-size: 0.9rem; margin-bottom: 2px; }
.meal-info p { font-size: 0.75rem; color: var(--text-muted); }

.meal-macros {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.meal-macros span { padding: 3px 8px; border-radius: 6px; }
.macro-cal { background: rgba(99,102,241,0.1); color: var(--primary); }
.macro-prot { background: rgba(16,185,129,0.1); color: var(--success); }

/* Exercise Card */
.exercise-item {
    display: grid;
    grid-template-columns: 1fr auto auto auto auto;
    gap: 12px;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-input);
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.exercise-item .label { color: var(--text-muted); font-size: 0.7rem; }

/* Day Tabs */
.day-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.day-tab {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    white-space: nowrap;
    transition: all 0.2s;
}

.day-tab.active, .day-tab:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Alert */
.alert {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-info { background: rgba(59,130,246,0.1); color: var(--info); border: 1px solid rgba(59,130,246,0.2); }
.alert-success { background: rgba(16,185,129,0.1); color: var(--success); border: 1px solid rgba(16,185,129,0.2); }
.alert-warning { background: rgba(245,158,11,0.1); color: var(--warning); border: 1px solid rgba(245,158,11,0.2); }

/* Responsive */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .menu-toggle { display: block; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .page-content { padding: 16px; }
    .exercise-item { grid-template-columns: 1fr; }
    .header { padding: 0 16px; }
}

/* Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

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

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.card { animation: fadeIn 0.3s ease; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }