:root {
    /* Dark Theme (Default) */
    --bg-main: #0a0c14;
    --bg-sidebar: #111420;
    --bg-card: #181d2d;
    --bg-input: #0f121d;
    --text-main: #f1f3f7;
    --text-muted: #8e99af;
    --primary: #00e5ff;
    --primary-glow: rgba(0, 229, 255, 0.3);
    --border: #222a3e;
    --danger: #ff5c5c;
    --success: #00fa9a;
    --warning: #ffb100;
    --glass: rgba(255, 255, 255, 0.03);
    --shadow: 0 10px 30px rgba(0,0,0,0.4);
    --sidebar-width: 280px;
}

body.light-mode {
    --bg-main: #f4f7fa;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-input: #f0f2f5;
    --text-main: #1a1f36;
    --text-muted: #697386;
    --primary: #0089a3;
    --primary-glow: rgba(0, 137, 163, 0.15);
    --border: #e6ebf1;
    --danger: #df1b41;
    --success: #00875a;
    --warning: #e2a100;
    --glass: rgba(0, 0, 0, 0.02);
    --shadow: 0 10px 30px rgba(0,0,0,0.05);
}

* { box-sizing: border-box; transition: background-color 0.3s, border-color 0.3s, color 0.3s; }

body {
    margin: 0;
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, sans-serif;
    display: flex;
    overflow-x: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    position: fixed;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-header {
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
}

.sidebar-nav {
    flex: 1;
    padding: 1rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    font-weight: 600;
    transition: 0.2s;
}

.nav-item:hover, .nav-item.active {
    background: var(--primary-glow);
    color: var(--primary);
}

.nav-item svg { width: 20px; height: 20px; }

/* Main Content area */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

header {
    height: 70px;
    padding: 0 2rem;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 90;
}

.search-bar {
    background: var(--bg-input);
    border: 1px solid var(--border);
    padding: 0.6rem 1rem;
    border-radius: 10px;
    width: 400px;
    color: var(--text-main);
    outline: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.theme-toggle {
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border);
}

/* Dashboard Container */
.content-container {
    padding: 2.5rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 1.75rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.stat-title { color: var(--text-muted); font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-value { font-size: 2.25rem; font-weight: 800; color: var(--text-main); }
.stat-icon { background: var(--primary-glow); padding: 0.75rem; border-radius: 12px; color: var(--primary); }

/* Featured Hot Trends */
.section-title { font-size: 1.5rem; font-weight: 800; margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.75rem; }

.hot-trends-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.trend-card {
    background: var(--bg-card);
    border-radius: 24px;
    border: 1px solid var(--border);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    transition: 0.3s;
}

.trend-card:hover { transform: translateY(-5px); border-color: var(--primary); }

.trend-rank { position: absolute; top: -10px; right: -10px; font-size: 4rem; font-weight: 900; color: var(--glass); z-index: 1; }

.trend-content { position: relative; z-index: 2; }
.trend-kw { font-size: 1.25rem; font-weight: 700; color: var(--primary); margin-bottom: 0.5rem; }

/* Table Container */
.data-table-card {
    background: var(--bg-card);
    border-radius: 24px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table-header { padding: 1.5rem 2rem; border-bottom: 1px solid var(--border); }

table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 1.25rem 1.5rem; font-size: 0.8rem; color: var(--text-muted); font-weight: 700; text-transform: uppercase; border-bottom: 1px solid var(--border); }
td { padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); font-size: 0.95rem; }

.score-badge { padding: 0.5rem 0.75rem; border-radius: 10px; font-weight: 800; }

/* Filters Section */
.filters-section {
    background: var(--bg-card);
    border-radius: 24px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-bottom: 2.5rem;
}

.filters-header {
    padding: 1.25rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    transition: background 0.2s;
}

.filters-header:hover { background: var(--primary-glow); }

.filters-content {
    padding: 2rem;
    display: none;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    border-top: 1px solid var(--border);
}

.filter-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

/* Inputs & Selects */
input, select {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.7rem 1rem;
    border-radius: 12px;
    outline: none;
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color 0.2s;
    width: 100%;
}

input:focus, select:focus { border-color: var(--primary); }

select option { background: var(--bg-card); }

/* Login Container */
.login-page {
    width: 100vw; height: 100vh;
    background: radial-gradient(circle at 10% 20%, var(--bg-sidebar) 0%, var(--bg-main) 90%);
    display: flex; justify-content: center; align-items: center;
}

.login-card {
    background: var(--bg-card);
    padding: 3.5rem;
    border-radius: 32px;
    border: 1px solid var(--border);
    width: 100%; max-width: 460px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6);
}

.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.6rem; font-weight: 600; color: var(--text-muted); }
.input-group input { 
    width: 100%; padding: 1rem; border-radius: 12px; background: var(--bg-input); 
    border: 1px solid var(--border); color: var(--text-main); outline: none;
}

.btn-primary {
    background: var(--primary);
    color: #000;
    width: 100%;
    padding: 1.1rem;
    border-radius: 14px;
    font-weight: 800;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    box-shadow: 0 10px 20px var(--primary-glow);
    transition: opacity 0.2s, transform 0.2s;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }

/* Quick Action Buttons (keyword detail page) */
.quick-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-muted);
    background: var(--bg-input);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
    white-space: nowrap;
    font-family: inherit;
}
.quick-btn:hover { color: var(--text-main); border-color: var(--text-muted); background: var(--bg-card); }

.quick-btn-open-all {
    color: var(--primary);
    background: var(--primary-glow);
    border-color: rgba(0, 229, 255, 0.3);
}
.quick-btn-open-all:hover { opacity: 0.85; }

/* ==============================
   SIDEBAR COLLAPSE
   ============================== */
.sidebar {
    transition: width 0.3s ease;
    overflow: hidden;
}
.sidebar.collapsed { width: 72px; }
.sidebar.collapsed .sidebar-label { display: none; }
.sidebar.collapsed .sidebar-header {
    padding: 1.25rem 0;
    justify-content: center;
    flex-direction: column;
    gap: 0.6rem;
}
.sidebar.collapsed .sidebar-collapse-btn {
    margin-left: 0;
    margin-right: 0;
}
.sidebar.collapsed .nav-item { justify-content: center; padding: 0.85rem; }

.sidebar-collapse-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px; height: 32px;
    border-radius: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    margin-left: auto;
    margin-right: 0.5rem;
    flex-shrink: 0;
    transition: 0.2s;
}
.sidebar-collapse-btn:hover { color: var(--primary); border-color: var(--primary); }

/* Mobile overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 99;
    backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* Hamburger button (mobile only) */
.hamburger-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 38px; height: 38px;
    border-radius: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
}

/* Popup blocked toast */
.popup-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--warning);
    color: var(--warning);
    padding: 1rem 1.5rem;
    border-radius: 14px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    z-index: 9999;
    max-width: 420px;
    text-align: center;
    animation: slideUp 0.3s ease;
}
@keyframes slideUp {
    from { transform: translateX(-50%) translateY(20px); opacity: 0; }
    to   { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* ==============================
   ACTION BUTTONS (Hover on table rows)
   ============================== */
.action-buttons {
    display: flex;
}
.action-btn {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    background: var(--primary-glow);
    border-radius: 4px;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid var(--primary);
    transition: all 0.2s ease;
    cursor: pointer;
}
.action-btn:hover {
    background: var(--primary);
    color: #000;
    transform: translateY(-2px);
}

/* ==============================
   METRIC TOOLTIPS
   ============================== */
.metric-tooltip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--border);
    font-size: 0.7rem;
    font-weight: 700;
    opacity: 0.6;
    transition: all 0.2s;
}
.metric-tooltip:hover {
    opacity: 1;
    background: var(--primary-glow);
    color: var(--primary);
}
.metric-tooltip::after {
    content: attr(title);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.6rem 0.8rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 1000;
    box-shadow: var(--shadow);
}
.metric-tooltip:hover::after {
    opacity: 1;
}

/* ==============================
   RESPONSIVE / MOBILE
   ============================== */
@media (max-width: 768px) {
    :root { --sidebar-width: 100%; }

    .sidebar {
        position: fixed;
        left: 0; top: 0;
        transform: translateY(-100%);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), width 0.3s ease;
        width: 100% !important;
        height: auto;
        padding-bottom: 1.5rem;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
        z-index: 100;
    }
    .sidebar.mobile-open { transform: translateY(0); }
    .sidebar.collapsed { width: 100% !important; }
    .sidebar.collapsed .sidebar-label { display: inline !important; }
    .sidebar.collapsed .sidebar-header span { display: inline !important; }
    .sidebar.collapsed .nav-item { justify-content: flex-start !important; padding: 0.85rem 1rem !important; }
    .sidebar-collapse-btn { display: none; }
    .hamburger-btn { display: flex; }

    .main-content { margin-left: 0; }

    header { padding: 0 1rem; }
    .search-bar { width: 180px; }

    .content-container { padding: 1.25rem; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 2rem; }
    .stat-value { font-size: 1.6rem; }

    .hot-trends-grid { grid-template-columns: 1fr; }

    table { font-size: 0.82rem; }
    th, td { padding: 0.75rem 0.85rem; }

    .data-table-card { border-radius: 16px; }
    .filters-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .search-bar { width: 140px; font-size: 0.8rem; }
    .filters-content { grid-template-columns: 1fr; }
    .header-actions gap { gap: 0.75rem; }
}