/**
 * Easy GA Stats - Unified Design System
 * Version: 1.0.0
 *
 * A clean, professional, full-width design system
 * Minimal icons, maximum clarity
 */

/* ============================================
   CSS VARIABLES - Design Tokens
   ============================================ */

:root {
    /* Colors - Light Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f5;
    --color-bg-hover: #e9ecef;

    --color-text-primary: #212529;
    --color-text-secondary: #495057;
    --color-text-tertiary: #868e96;
    --color-text-muted: #adb5bd;

    --color-border-primary: #dee2e6;
    --color-border-secondary: #e9ecef;

    --color-accent: #0066cc;
    --color-accent-hover: #0052a3;
    --color-accent-light: #e7f1ff;

    --color-success: #2e7d32;
    --color-success-bg: #e8f5e9;
    --color-warning: #f57c00;
    --color-warning-bg: #fff3e0;
    --color-danger: #c62828;
    --color-danger-bg: #ffebee;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Layout */
    --header-height: 56px;
    --content-max-width: 98%;
    --content-padding: 1.5rem;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 6px;
    --border-radius-lg: 8px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #242424;
    --color-bg-tertiary: #2d2d2d;
    --color-bg-hover: #363636;

    --color-text-primary: #f1f3f5;
    --color-text-secondary: #ced4da;
    --color-text-tertiary: #909296;
    --color-text-muted: #5c5f66;

    --color-border-primary: #373a40;
    --color-border-secondary: #2c2e33;

    --color-accent: #4da6ff;
    --color-accent-hover: #80bdff;
    --color-accent-light: #1a3a5c;

    --color-success: #66bb6a;
    --color-success-bg: #1b3d1f;
    --color-warning: #ffb74d;
    --color-warning-bg: #3d2e1a;
    --color-danger: #ef5350;
    --color-danger-bg: #3d1a1a;
}

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    min-height: 100vh;
}

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

a:hover {
    color: var(--color-accent-hover);
}

/* ============================================
   LAYOUT
   ============================================ */

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    width: var(--content-max-width);
    max-width: 100%;
    margin: 0 auto;
    padding: var(--content-padding);
    padding-top: calc(var(--header-height) + var(--content-padding));
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-primary);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 var(--content-padding);
}

.header-inner {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.site-logo {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    white-space: nowrap;
}

.site-logo:hover {
    color: var(--color-text-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.nav-link.active {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* User Dropdown */
.user-dropdown {
    position: relative;
}

.user-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-button:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-secondary);
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-xs));
    right: 0;
    min-width: 200px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.user-dropdown.open .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast);
}

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

.dropdown-divider {
    height: 1px;
    background: var(--color-border-primary);
    margin: var(--spacing-xs) 0;
}

/* Theme Toggle */
.theme-toggle {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.breadcrumb-link:hover {
    color: var(--color-accent);
}

.breadcrumb-separator {
    color: var(--color-text-muted);
}

.breadcrumb-current {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   PAGE HEADER
   ============================================ */

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.card-footer {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-sm);
}

/* Stat Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   TABLES
   ============================================ */

.table-container {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-primary);
}

.table-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

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

.data-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-primary);
    white-space: nowrap;
}

.data-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-border-secondary);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background: var(--color-bg-hover);
}

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

/* Table alignment */
.text-right {
    text-align: right;
}

.text-center {
    text-align: center;
}

/* ============================================
   STATUS INDICATORS
   ============================================ */

.status {
    display: inline-flex;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.status-ok {
    color: var(--color-success);
}

.status-warning {
    color: var(--color-warning);
}

.status-error {
    color: var(--color-danger);
}

/* Trend Indicators */
.trend {
    display: inline-flex;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.trend-up {
    color: var(--color-success);
}

.trend-down {
    color: var(--color-danger);
}

.trend-neutral {
    color: var(--color-text-tertiary);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    border-radius: var(--border-radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
}

/* ============================================
   TABS
   ============================================ */

.tabs {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border-primary);
    margin-bottom: var(--spacing-xl);
}

.tab {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: -1px;
}

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

.tab.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* ============================================
   ALERTS & NOTICES
   ============================================ */

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.alert-info {
    background: var(--color-accent-light);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.alert-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid var(--color-warning);
}

.alert-danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

/* ============================================
   ATTENTION ITEMS
   ============================================ */

.attention-list {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.attention-header {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-primary);
}

.attention-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-secondary);
    font-size: var(--font-size-sm);
}

.attention-item:last-child {
    border-bottom: none;
}

.attention-item:hover {
    background: var(--color-bg-hover);
}

.attention-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.attention-indicator {
    font-size: var(--font-size-base);
}

.attention-text {
    color: var(--color-text-primary);
}

.attention-action {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
}

.attention-action:hover {
    color: var(--color-accent);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

/* ============================================
   DROPDOWN MENUS
   ============================================ */

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-xs));
    right: 0;
    min-width: 180px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Nav Dropdown (for header navigation) */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.nav-dropdown .nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.nav-dropdown .nav-link .dropdown-arrow {
    font-size: 10px;
    transition: transform var(--transition-fast);
}

.nav-dropdown.open .nav-link .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    min-width: 200px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 1002;
    padding: var(--spacing-xs) 0;
}

.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    transition: background var(--transition-fast);
    white-space: nowrap;
}

.nav-dropdown-item:hover {
    background: var(--color-bg-hover);
    color: var(--color-accent);
}

.nav-dropdown-item .item-icon {
    margin-right: 8px;
    opacity: 0.7;
}

.nav-dropdown-divider {
    height: 1px;
    background: var(--color-border-primary);
    margin: var(--spacing-xs) 0;
}

/* ============================================
   SYNC STATUS
   ============================================ */

.sync-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.sync-status.ok {
    color: var(--color-success);
}

.sync-status.stale {
    color: var(--color-warning);
}

/* ============================================
   SCORE DISPLAY
   ============================================ */

.score {
    font-weight: var(--font-weight-semibold);
}

.score-excellent {
    color: var(--color-success);
}

.score-good {
    color: #558b2f;
}

.score-fair {
    color: var(--color-warning);
}

.score-poor {
    color: var(--color-danger);
}

/* ============================================
   DOMAIN ROW
   ============================================ */

.domain-name {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.domain-name a {
    color: inherit;
}

.domain-name a:hover {
    color: var(--color-accent);
}

/* ============================================
   UTILITIES
   ============================================ */

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

.gap-lg {
    gap: var(--spacing-lg);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.text-sm {
    font-size: var(--font-size-sm);
}

.text-muted {
    color: var(--color-text-tertiary);
}

.font-medium {
    font-weight: var(--font-weight-medium);
}

.font-semibold {
    font-weight: var(--font-weight-semibold);
}

/* Hide elements */
.hidden {
    display: none !important;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   RESPONSIVE (minimal, desktop-first)
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --content-padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}