/* ==========================================================================
   YT MONITOR PRO - STYLING DESIGN SYSTEM WITH MULTI-USER AUTHENTICATION
   ========================================================================== */

/* ===== CSS Variables & Tokens ===== */
:root {
    /* Color Palette */
    --bg-base: hsl(240, 24%, 6%);
    --bg-surface: hsl(240, 20%, 9%);
    --bg-card: hsla(240, 20%, 13%, 0.5);
    --bg-card-hover: hsla(240, 20%, 18%, 0.7);
    --border-color: hsla(240, 15%, 20%, 0.4);
    --border-color-focus: hsla(240, 15%, 35%, 0.7);
    
    /* Typography Colors */
    --text-primary: hsl(240, 10%, 93%);
    --text-secondary: hsl(240, 8%, 70%);
    --text-muted: hsl(240, 6%, 45%);
    
    /* Accent & Brand Colors */
    --accent: hsl(345, 100%, 55%);
    --accent-glow: hsla(345, 100%, 55%, 0.25);
    --accent-gradient: linear-gradient(135deg, hsl(345, 100%, 55%) 0%, hsl(14, 100%, 65%) 100%);
    
    /* Semantic Colors */
    --color-green: hsl(150, 80%, 42%);
    --color-purple: hsl(255, 85%, 68%);
    --color-pink: hsl(325, 90%, 60%);
    --color-blue: hsl(195, 90%, 50%);
    --color-red-danger: hsl(0, 85%, 60%);
    
    /* Dimensions */
    --sidebar-width: 260px;
    --header-height: 70px;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;
    
    /* Motion */
    --easing: cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition: 0.3s var(--easing);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

/* ===== Beautiful Custom Scrollbar for Browser ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
    background: hsl(240, 15%, 22%);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: hsl(240, 15%, 32%);
}

/* ===== Multi-User Auth Screen (Overlay) ===== */
.auth-screen-overlay {
    position: fixed;
    inset: 0;
    z-index: 1500;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-base);
    overflow: hidden;
    padding: 20px;
}

.auth-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 100%;
    max-width: 440px;
    padding: 36px;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 10;
    animation: fadeInScale 0.45s var(--easing);
}

.auth-card-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-card-header h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.auth-card-header p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 6px;
    letter-spacing: 0.1px;
}

.accent-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* Auth Selector Tabs */
.auth-tabs {
    display: flex;
    background-color: hsla(240, 20%, 9%, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 3px;
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    padding: 10px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    font-family: inherit;
    transition: all var(--transition);
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab.active {
    color: white;
    background: var(--accent-gradient);
    box-shadow: 0 2px 10px hsla(345, 100%, 55%, 0.2);
}

/* Forms styling inside Auth screen */
.auth-form-pane {
    display: none;
    animation: fadeInScale 0.35s var(--easing);
}

.auth-form-pane.active {
    display: block;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.btn-auth-submit {
    width: 100%;
    padding: 13px;
    font-size: 14.5px;
    margin-top: 8px;
}

/* Ambient Radial Background Glows */
.auth-bg-glow-1 {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, hsla(345, 100%, 55%, 0.15) 0%, transparent 70%);
    top: -100px;
    left: -100px;
    pointer-events: none;
}

.auth-bg-glow-2 {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, hsla(255, 85%, 68%, 0.12) 0%, transparent 70%);
    bottom: -150px;
    right: -150px;
    pointer-events: none;
}

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

/* ===== Sidebar Navigation ===== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-brand {
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
}

.brand-name {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 19px;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.brand-badge {
    background: var(--accent-gradient);
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    text-transform: uppercase;
}

.sidebar-menu {
    padding: 20px 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.menu-item svg {
    width: 18px;
    height: 18px;
    stroke-width: 2.2px;
}

.menu-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.menu-item.active {
    color: var(--text-primary);
    background-color: var(--accent-glow);
    border-left: 3px solid var(--accent);
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
}

.menu-item.active svg {
    color: var(--accent);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* User Profile Badge (Multi-User Session Indicator) */
.user-profile-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background-color: hsla(240, 20%, 13%, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.user-avatar-lbl {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 10px hsla(345, 100%, 55%, 0.2);
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name-lbl {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email-lbl {
    font-size: 11.5px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 1px;
}

.btn-logout-auth {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.btn-logout-auth svg {
    width: 14px;
    height: 14px;
    stroke-width: 2.2px;
}

.btn-logout-auth:hover {
    color: var(--color-red-danger);
    background-color: hsla(0, 85%, 60%, 0.12);
}

.version-info {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.2px;
    padding-left: 4px;
}

/* ===== Main Panel Wrapper ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin var(--transition);
}

/* ===== Premium Header Layout ===== */
.header {
    height: var(--header-height);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: hsla(240, 24%, 6%, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 90;
}

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

.mobile-toggle-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.mobile-toggle-btn:hover {
    background-color: var(--bg-card-hover);
}

.page-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 24px;
    letter-spacing: -0.5px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== Action Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-size: 13.5px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn svg {
    width: 16px;
    height: 16px;
    stroke-width: 2.2px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px hsla(345, 100%, 55%, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1.5px);
    box-shadow: 0 6px 26px hsla(345, 100%, 55%, 0.45);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-ghost {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-ghost:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-focus);
}

.btn-oauth {
    background-color: hsla(217, 89%, 61%, 0.12);
    color: hsl(217, 89%, 68%);
    border-color: hsla(217, 89%, 61%, 0.25);
}

.btn-oauth:hover {
    background-color: hsla(217, 89%, 61%, 0.2);
    border-color: hsla(217, 89%, 61%, 0.4);
}

.btn-oauth.connected {
    background-color: hsla(150, 80%, 42%, 0.12);
    color: hsl(150, 80%, 48%);
    border-color: hsla(150, 80%, 42%, 0.25);
}

.btn-danger {
    background-color: hsla(0, 85%, 60%, 0.12);
    color: hsl(0, 85%, 65%);
    border-color: hsla(0, 85%, 60%, 0.2);
}

.btn-danger:hover {
    background-color: hsla(0, 85%, 60%, 0.22);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* ===== Date Range Selectors ===== */
.date-selector {
    display: flex;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 3px;
    overflow: hidden;
}

.date-btn {
    padding: 8px 14px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all var(--transition);
    font-family: inherit;
}

.date-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-card);
}

.date-btn.active {
    color: white;
    background: var(--accent-gradient);
    box-shadow: 0 2px 10px hsla(345, 100%, 55%, 0.2);
}

/* ===== Dashboard Panels ===== */
.page-panel {
    display: none;
    padding: 32px;
    flex: 1;
    animation: fadeInScale 0.4s var(--easing);
}

.page-panel.active {
    display: block;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.98) translateY(6px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ===== Alert & Information Bar ===== */
.status-alert-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 28px;
    font-size: 13.5px;
    color: var(--text-secondary);
}

.alert-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-icon {
    color: var(--text-muted);
    width: 16px;
    height: 16px;
}

.sub-date {
    opacity: 0.6;
    font-size: 12.5px;
    margin-left: 4px;
}

.auth-badge-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    color: hsl(40, 95%, 60%);
    padding: 4px 12px;
    background-color: hsla(40, 95%, 60%, 0.08);
    border: 1px solid hsla(40, 95%, 60%, 0.15);
    border-radius: 20px;
    white-space: nowrap;
}

.auth-badge-status.connected {
    color: var(--color-green);
    background-color: hsla(150, 80%, 42%, 0.08);
    border-color: hsla(150, 80%, 42%, 0.15);
}

.auth-badge-status.connected .badge-icon {
    color: var(--color-green);
}

.auth-badge-status .badge-icon {
    width: 14px;
    height: 14px;
    color: hsl(40, 95%, 60%);
}

.auth-badge-status a {
    color: hsl(210, 95%, 65%);
    font-weight: 600;
}

.auth-badge-status a:hover {
    text-decoration: underline;
}

/* ===== Premium Cards Design with Glow ===== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 28px;
}

.metric-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 18px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition);
}

.metric-card:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-focus);
    transform: translateY(-3px);
}

.metric-card:hover .card-glow {
    opacity: 0.12;
}

.card-glow {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--accent-gradient);
    filter: blur(40px);
    bottom: -60px;
    right: -60px;
    opacity: 0.04;
    transition: opacity var(--transition);
    pointer-events: none;
}

.metric-visual {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.metric-visual svg {
    width: 22px;
    height: 22px;
    stroke-width: 2.2px;
    color: white;
}

.icon-red { background: linear-gradient(135deg, hsl(345, 100%, 55%), hsl(355, 100%, 65%)); }
.icon-purple { background: linear-gradient(135deg, hsl(255, 85%, 68%), hsl(265, 85%, 75%)); }
.icon-pink { background: linear-gradient(135deg, hsl(325, 90%, 60%), hsl(335, 90%, 70%)); }
.icon-blue { background: linear-gradient(135deg, hsl(195, 90%, 50%), hsl(205, 90%, 60%)); }

.metric-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.metric-value {
    font-family: 'Outfit', sans-serif;
    font-size: 26px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

/* ===== Content Card ===== */
.content-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.card-header {
    padding: 22px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.2px;
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sync-timestamp {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.btn-refresh {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.btn-refresh svg {
    width: 16px;
    height: 16px;
    stroke-width: 2.2px;
}

.btn-refresh:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-focus);
}

.btn-refresh:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-refresh.loading svg {
    animation: rotateCw 0.8s linear infinite;
}

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

/* ===== Modern Responsive Table UI ===== */
.table-scroll-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 1000px;
}

.data-table thead {
    background-color: hsla(240, 20%, 9%, 0.3);
}

.data-table th {
    padding: 16px 20px;
    font-size: 11.5px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.data-table td {
    padding: 16px 20px;
    font-size: 14.5px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr {
    transition: background var(--transition);
}

.data-table tbody tr:hover td {
    background-color: hsla(255, 255, 255, 0.015);
}

/* Channel Profile Cell formatting */
.profile-channel-cell {
    display: flex;
    align-items: center;
    gap: 12px;
}

.profile-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.profile-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.profile-handle {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 1px;
}

.tbl-col-views { font-weight: 600; }
.tbl-col-subs { font-weight: 600; }
.tbl-col-revenue { color: var(--color-green); font-weight: 600; }

.val-na {
    opacity: 0.3;
    font-weight: 400;
}

.sub-cell-lbl {
    font-size: 10px;
    opacity: 0.4;
    font-weight: 500;
    margin-left: 2px;
}

/* Action cell delete button styling */
.action-cell {
    text-align: center;
}

.btn-table-del {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.btn-table-del svg {
    width: 15px;
    height: 15px;
    stroke-width: 2.2px;
}

.btn-table-del:hover {
    color: var(--color-red-danger);
    background-color: hsla(0, 85%, 60%, 0.12);
}

/* ===== Empty State UI ===== */
.empty-state-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px;
    text-align: center;
}

.empty-icon-box {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.empty-icon-box svg {
    width: 28px;
    height: 28px;
}

.empty-state-container h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
}

.empty-state-container p {
    font-size: 14px;
    color: var(--text-muted);
    max-width: 380px;
    margin-top: 8px;
    line-height: 1.5;
}

/* ===== Settings Page Design ===== */
.settings-grid {
    display: grid;
    grid-template-columns: 2.4fr 1.2fr;
    gap: 24px;
}

.settings-main {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.settings-box {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.settings-header {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.settings-title-icon {
    width: 24px;
    height: 24px;
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.settings-header h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 17px;
    font-weight: 700;
}

.settings-header p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.5;
}

.form-control {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-control label {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.field-tip {
    font-size: 11.5px;
    color: var(--text-muted);
}

.tip-optional {
    font-weight: 400;
    text-transform: none;
    opacity: 0.65;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition);
}

input[type="text"]:focus, input[type="password"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder {
    color: var(--text-muted);
}

.input-action-group {
    display: flex;
    position: relative;
}

.input-action-group input {
    padding-right: 50px;
}

.btn-input-toggle {
    position: absolute;
    right: 4px;
    top: 4px;
    bottom: 4px;
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0 12px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition);
}

.btn-input-toggle:hover {
    color: var(--text-primary);
}

.btn-input-toggle svg {
    width: 18px;
    height: 18px;
}

.settings-action-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

/* OAuth Connection indicator bar inside settings page */
.oauth-connection-info {
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-surface);
    padding: 6px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.connection-status-dot {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-red-danger);
}

.pulse-dot.connected {
    background-color: var(--color-green);
    animation: simplePulse 2s infinite;
}

@keyframes simplePulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.status-text {
    color: var(--text-secondary);
}

/* Documentation Guide sidebar panels */
.guide-box {
    padding: 28px;
}

.guide-box h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.step-number {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.step-text strong {
    font-size: 13.5px;
    color: var(--text-primary);
    display: block;
}

.step-text p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.5;
}

.step-text a {
    color: var(--color-purple);
    font-weight: 500;
}

.step-text a:hover {
    text-decoration: underline;
}

/* ===== Dialog Modal Overlay and Layout ===== */
.modal-overlay-wrapper {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.modal-overlay-wrapper.active {
    opacity: 1;
    visibility: visible;
}

.dialog-modal {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 520px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.7);
    transform: scale(0.96) translateY(12px);
    transition: transform var(--transition);
    overflow: hidden;
}

.modal-overlay-wrapper.active .dialog-modal {
    transform: scale(1) translateY(0);
}

.dialog-header {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.dialog-header h3 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 18px;
}

.dialog-close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.dialog-close-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.dialog-close-btn svg {
    width: 20px;
    height: 20px;
}

/* Modal Internal Tab-menu trigger buttons */
.dialog-tabs {
    display: flex;
    background-color: hsla(240, 20%, 9%, 0.4);
    border-bottom: 1px solid var(--border-color);
}

.tab-trigger {
    flex: 1;
    padding: 14px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    transition: all var(--transition);
}

.tab-trigger svg {
    width: 15px;
    height: 15px;
}

.tab-trigger:hover {
    color: var(--text-primary);
    background-color: var(--bg-card);
}

.tab-trigger.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
    background-color: hsla(345, 100%, 55%, 0.04);
}

/* Dialog body and footer spaces */
.dialog-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.dialog-footer {
    padding: 16px 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    border-top: 1px solid var(--border-color);
    background-color: hsla(240, 20%, 9%, 0.2);
}

.tab-pane-content {
    display: none;
}

.tab-pane-content.active {
    display: block;
}

/* OAuth Promotional section inside Dialog Content */
.oauth-promo-box {
    display: flex;
    gap: 16px;
    padding: 16px;
    background-color: hsla(217, 89%, 61%, 0.08);
    border: 1px solid hsla(217, 89%, 61%, 0.15);
    border-radius: var(--radius-md);
    line-height: 1.5;
}

.promo-icon {
    width: 22px;
    height: 22px;
    color: hsl(217, 89%, 68%);
    flex-shrink: 0;
}

.oauth-promo-box h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.oauth-promo-box p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.btn-oauth-full {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    background-color: hsl(217, 89%, 61%);
    color: white;
    box-shadow: 0 4px 15px hsla(217, 89%, 61%, 0.25);
    font-family: inherit;
    transition: all var(--transition);
}

.btn-oauth-full:hover {
    background-color: hsl(217, 89%, 55%);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px hsla(217, 89%, 61%, 0.35);
}

.btn-oauth-full svg {
    width: 16px;
    height: 16px;
}

/* Channels automatic selector scroller */
.oauth-result-box {
    margin-top: 16px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    animation: fadeInScale 0.3s var(--easing);
}

.list-heading {
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 10px;
}

.channels-scroller {
    max-height: 220px;
    overflow-y: auto;
    background-color: hsla(240, 20%, 9%, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 6px;
}

.oauth-channel-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition);
}

.oauth-channel-item:hover {
    background-color: var(--bg-card-hover);
}

.oauth-channel-item img {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border-color);
}

.oauth-channel-info {
    flex: 1;
    min-width: 0;
}

.oauth-channel-title {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.oauth-channel-meta {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Custom Checkbox Design matching modern dashboard aesthetics */
.custom-checkbox {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    width: 0; height: 0;
}

.checkbox-box {
    width: 18px;
    height: 18px;
    border: 1.5px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.custom-checkbox input:checked + .checkbox-box {
    background-color: var(--accent);
    border-color: var(--accent);
}

.checkbox-box::after {
    content: '';
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg) scale(0);
    transition: transform var(--transition);
    margin-bottom: 2px;
}

.custom-checkbox input:checked + .checkbox-box::after {
    transform: rotate(45deg) scale(1);
}

.custom-checkbox:hover .checkbox-box {
    border-color: var(--border-color-focus);
}

.custom-checkbox input:focus + .checkbox-box {
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ===== Toast Stack Notification UI ===== */
.toast-wrapper-stack {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    padding: 14px 20px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13.5px;
    font-weight: 500;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 380px;
    animation: toastSlideIn 0.35s var(--easing);
    transition: opacity 0.3s, transform 0.3s;
}

.toast.success {
    border-color: hsla(150, 80%, 42%, 0.3);
}

.toast.error {
    border-color: hsla(0, 85%, 60%, 0.3);
}

.toast.success::before {
    content: '✓';
    color: var(--color-green);
    font-weight: 700;
}

.toast.error::before {
    content: '✕';
    color: var(--color-red-danger);
    font-weight: 700;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ===== Loading Spinner ===== */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

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

/* ===== Responsive Adaptability Layout ===== */
@media (max-width: 1200px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .mobile-toggle-btn {
        display: block;
    }
    .header {
        padding: 0 20px;
    }
    .page-panel {
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .header {
        flex-wrap: wrap;
        height: auto;
        padding-top: 12px;
        padding-bottom: 12px;
        gap: 12px;
    }
    .header-right {
        width: 100%;
        justify-content: space-between;
        flex-wrap: wrap;
    }
    .date-selector {
        order: 10;
        width: 100%;
    }
    .date-btn {
        flex: 1;
        text-align: center;
    }
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    .status-alert-bar {
        flex-wrap: wrap;
    }
    .auth-badge-status {
        width: 100%;
        margin-top: 4px;
    }
    .dialog-modal {
        max-width: 95%;
    }
}