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

:root {
    --bg: #f5f7fa;
    --sidebar-bg: #1a1f36;
    --sidebar-text: #a0aec0;
    --sidebar-active: #fff;
    --card-bg: #fff;
    --text: #2d3748;
    --text-light: #718096;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #e2e8f0;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.1);
}

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }

.hidden { display: none !important; }

/* === LOGIN === */
.login-screen {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh; background: linear-gradient(135deg, #1a1f36 0%, #2d3748 100%);
}
.login-box {
    background: var(--card-bg); padding: 48px 40px; border-radius: 12px;
    text-align: center; width: 100%; max-width: 400px; box-shadow: 0 20px 60px rgba(0,0,0,.3);
}
.login-logo { font-size: 48px; margin-bottom: 8px; }
.login-box h1 { font-size: 24px; margin-bottom: 4px; }
.login-box > p { color: var(--text-light); margin-bottom: 24px; }
.login-box input {
    width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 16px; margin-bottom: 16px;
}
.login-box button {
    width: 100%; padding: 12px; background: var(--primary); color: #fff; border: none;
    border-radius: var(--radius); font-size: 16px; cursor: pointer; font-weight: 600;
}
.login-box button:hover { background: var(--primary-hover); }
.login-error { color: var(--danger); font-size: 14px; margin-top: 8px; min-height: 20px; }

/* === APP LAYOUT === */
.app { display: flex; min-height: 100vh; }

.sidebar {
    width: 240px; background: var(--sidebar-bg); color: var(--sidebar-text);
    display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
    transition: transform .3s;
}
.sidebar-header { padding: 20px; border-bottom: 1px solid rgba(255,255,255,.1); }
.sidebar-header h2 { color: #fff; font-size: 18px; }
.nav-list { list-style: none; flex: 1; padding: 12px 0; }
.nav-link {
    display: block; padding: 10px 20px; color: var(--sidebar-text); text-decoration: none;
    font-size: 15px; transition: all .2s; border-left: 3px solid transparent;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,.05); }
.nav-link.active { color: var(--sidebar-active); background: rgba(255,255,255,.08); border-left-color: var(--primary); }
.nav-divider { height: 1px; background: rgba(255,255,255,.1); margin: 8px 20px; list-style: none; }

.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,.1); }
.content-plan-link {
    display: block; padding: 8px 12px; background: rgba(255,255,255,.08); border-radius: var(--radius);
    color: var(--sidebar-text); text-decoration: none; text-align: center; font-size: 14px; margin-bottom: 8px;
}
.content-plan-link:hover { background: rgba(255,255,255,.15); color: #fff; }
.logout-btn {
    width: 100%; padding: 8px; background: none; border: 1px solid rgba(255,255,255,.15);
    color: var(--sidebar-text); border-radius: var(--radius); cursor: pointer; font-size: 14px;
}
.logout-btn:hover { background: rgba(255,255,255,.08); color: #fff; }

.main-content { flex: 1; margin-left: 240px; padding: 0; }

/* === TOPBAR === */
.topbar {
    display: flex; align-items: center; gap: 16px; padding: 16px 24px;
    background: var(--card-bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50;
}
.topbar h1 { font-size: 20px; flex: 1; }
.menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }
.platform-select {
    padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 14px; background: #fff;
}

/* === PAGES === */
.page { display: none; padding: 24px; }
.page.active { display: block; }

.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.page-header h2 { font-size: 20px; }

/* === BUTTONS === */
.btn {
    padding: 8px 16px; border: none; border-radius: var(--radius); font-size: 14px;
    font-weight: 500; cursor: pointer; transition: all .2s; text-decoration: none; display: inline-block;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #edf2f7; color: var(--text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* === STAT CARDS === */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: var(--card-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border);
}
.stat-label { font-size: 13px; color: var(--text-light); text-transform: uppercase; letter-spacing: .5px; }
.stat-value { font-size: 28px; font-weight: 700; margin: 4px 0; }
.stat-change { font-size: 13px; display: inline-block; }
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

.comparison-detail { margin-top: 4px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* === CHARTS === */
.charts-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 16px; margin-bottom: 24px; }
.chart-card {
    background: var(--card-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border);
}
.chart-card h3 { font-size: 15px; margin-bottom: 12px; color: var(--text-light); }
.chart-card.full-width { grid-column: 1 / -1; }

/* === TABLES === */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f8fafc; font-weight: 600; color: var(--text-light); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; white-space: nowrap; }
td { white-space: nowrap; }
.platform-breakdown { background: var(--card-bg); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border); }
.platform-breakdown h3 { font-size: 15px; margin-bottom: 12px; color: var(--text-light); }

/* === FORMS === */
.form-card {
    background: var(--card-bg); padding: 24px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border); margin-bottom: 20px;
}
.form-card h3 { font-size: 16px; margin-bottom: 16px; }
.form-row { display: flex; gap: 12px; margin-bottom: 12px; }
.form-group { flex: 1; margin-bottom: 12px; }
.form-group.flex-2 { flex: 2; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-light); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 14px; font-family: inherit;
}
.form-group textarea { resize: vertical; }
.form-actions { display: flex; gap: 8px; margin-top: 8px; }

/* === FILTER BAR === */
.filter-bar { display: flex; gap: 12px; margin-bottom: 16px; }
.filter-bar select {
    padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 14px; background: #fff;
}

/* === TASKS === */
.tasks-list { display: flex; flex-direction: column; gap: 8px; }
.task-item {
    display: flex; align-items: center; gap: 12px; padding: 12px 16px;
    background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.task-check { width: 20px; height: 20px; cursor: pointer; accent-color: var(--primary); }
.task-info { flex: 1; }
.task-title { font-weight: 500; }
.task-title.done { text-decoration: line-through; color: var(--text-light); }
.task-meta { font-size: 12px; color: var(--text-light); display: flex; gap: 8px; flex-wrap: wrap; }
.task-badge {
    display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 11px; font-weight: 600;
}
.badge-high { background: #fef2f2; color: var(--danger); }
.badge-medium { background: #fffbeb; color: var(--warning); }
.badge-low { background: #f0fdf4; color: var(--success); }
.task-actions { display: flex; gap: 4px; }

/* === DATA PAGE === */
.data-actions { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.data-card {
    background: var(--card-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border);
}
.data-card h3 { font-size: 15px; margin-bottom: 4px; }
.data-card p { font-size: 13px; color: var(--text-light); margin-bottom: 12px; }
.existing-data {
    background: var(--card-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border); margin-top: 20px;
}
.existing-data h3 { font-size: 15px; margin-bottom: 12px; color: var(--text-light); }

/* ═══════════════════════════════════════════
   ANALYTICS SECTION STYLES
   ═══════════════════════════════════════════ */

/* Analytics Sub-tabs */
.analytics-tabs {
    display: flex; gap: 4px; margin-bottom: 24px;
    background: var(--card-bg); padding: 4px; border-radius: var(--radius);
    border: 1px solid var(--border); box-shadow: var(--shadow);
}
.analytics-tab {
    flex: 1; padding: 10px 16px; border: none; background: none;
    font-size: 14px; font-weight: 500; cursor: pointer;
    border-radius: 6px; transition: all .2s; color: var(--text-light);
}
.analytics-tab:hover { background: #f1f5f9; color: var(--text); }
.analytics-tab.active { background: var(--primary); color: #fff; }

/* Analytics Panels */
.analytics-panel { display: none; }
.analytics-panel.active { display: block; }

/* Week Header */
.week-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 20px; flex-wrap: wrap; gap: 12px;
}
.week-header h3 { font-size: 18px; font-weight: 600; }
.week-date-range {
    font-size: 14px; color: var(--text-light);
    background: #f1f5f9; padding: 4px 12px; border-radius: 16px;
}

/* Comparison Grid (Current Week) */
.comparison-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px;
}

/* Platform Cards Grid */
.platform-cards-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px;
}

.platform-card {
    background: var(--card-bg); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow); border: 1px solid var(--border);
    transition: transform .2s, box-shadow .2s;
}
.platform-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,.12);
}

.platform-card-header {
    display: flex; align-items: center; gap: 8px; margin-bottom: 16px;
    padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.platform-card-icon { font-size: 24px; }
.platform-card-name { font-size: 16px; font-weight: 600; }

.platform-card-stats {
    display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
    font-size: 13px; color: var(--text-light);
}
.platform-card-stats > div {
    display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
}
.platform-card-stats strong {
    color: var(--text); font-size: 15px;
}

.platform-card-empty-msg {
    color: var(--text-light); font-size: 14px; text-align: center; padding: 20px 0;
}

/* Monthly Notes */
.note-entry {
    background: #f8fafc; padding: 12px 16px; border-radius: var(--radius);
    border: 1px solid var(--border); margin-bottom: 8px;
}
.note-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 6px;
}
.note-entry p {
    font-size: 14px; color: var(--text); white-space: pre-wrap; line-height: 1.6;
}

/* === MODAL === */
.modal {
    position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex;
    align-items: center; justify-content: center; z-index: 200;
}
.modal-content {
    background: var(--card-bg); padding: 24px; border-radius: var(--radius);
    max-width: 400px; width: 90%; text-align: center;
}
.modal-content p { margin-bottom: 20px; font-size: 15px; }
.modal-actions { display: flex; gap: 8px; justify-content: center; }

/* === TOAST === */
.toast {
    position: fixed; bottom: 24px; right: 24px; padding: 12px 24px;
    background: #1a1f36; color: #fff; border-radius: var(--radius);
    font-size: 14px; z-index: 300; box-shadow: 0 4px 12px rgba(0,0,0,.2);
    animation: slideIn .3s;
}
@keyframes slideIn { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* === EMPTY === */
.empty-msg { text-align: center; padding: 40px; color: var(--text-light); font-size: 15px; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .menu-toggle { display: block; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .charts-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; gap: 0; }
    .data-actions { grid-template-columns: 1fr; }
    .topbar h1 { font-size: 16px; }
    .analytics-tabs { flex-direction: column; }
    .week-header { flex-direction: column; align-items: flex-start; }
    .comparison-grid { grid-template-columns: repeat(2, 1fr); }
    .platform-cards-grid { grid-template-columns: 1fr; }
}