/**
 * Theme Variables CSS
 * Light and Dark theme CSS custom properties
 * 
 * ARCHITECTURE:
 * 1. :root defines UNIVERSAL DEFAULTS (fallbacks)
 * 2. Client custom.css can override --clr-primary, --clr-secondary, --sec-* in :root
 * 3. [data-theme="dark"] provides dark-specific variants
 * 4. Client can optionally define --clr-primary-dark, --clr-secondary-dark for custom dark colors
 */

/* ============================================
   ROOT - Universal Default Colors (Fallbacks)
   
   NOTE: --clr-primary and --clr-secondary are defined in:
   1. StyleHelper.php (inline CSS) - sets defaults
   2. Client custom.css - overrides per client
   
   Do NOT define them here - let client custom.css take precedence!
   ============================================ */
:root {
    /* Color scheme hint for browser UI */
    color-scheme: light dark;
    
    /* ========== PRIMARY & SECONDARY BRAND COLORS ========== */
    /* These are defined in client custom.css - DO NOT override here */
    
    /* Dark mode variants - clients can optionally define these */
    /* If not defined, dark mode will use lighter version of regular colors */
    --clr-primary-dark: var(--clr-primary);
    --clr-secondary-dark: var(--clr-secondary);
    
    /* ========== SECTION COLORS (Skill-based) ========== */
    /* Light mode section colors */
    --sec-speaking: #1565c0;
    --sec-reading: #ef6c00;
    --sec-writing: #9e007c;
    --sec-listening: #166534;
    
    /* Dark mode section colors - brighter/lighter for visibility */
    --sec-speaking-dark: #42a5f5;
    --sec-reading-dark: #ffb74d;
    --sec-writing-dark: #ce93d8;
    --sec-listening-dark: #4ade80;
    
    /* ========== STATUS COLORS ========== */
    --success: #166534;
    --success-fg: #166534;
    --success-bg: #f0fdf4;
    --success-br: #bbf7d0;
    --success-bg-dark: #166534;
    
    --danger: #dc2626;
    --danger-fg: #dc2626;
    --danger-bg: #fef2f2;
    --danger-br: #fecaca;
    --danger-bg-dark: #b91c1c;
    
    --warning: #ea580c;
    --warning-fg: #ea580c;
    --warning-bg: #fff7ed;
    --warning-br: #fed7aa;
    --warning-bg-dark: #c2410c;
    
    /* ========== TYPE COLORS ========== */
    --type-practice: rgb(3, 94, 39);
    --type-skill: rgba(39, 10, 132, 0.67);
    --type-long: rgb(100, 39, 126);
}

/* ============================================
   LIGHT THEME (Default)
   ============================================ */
[data-theme="light"],
:root:not([data-theme="dark"]) {
    /* Background colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* Surface colors */
    --surface-card: #ffffff;
    --surface-hover: #f8fafc;
    --surface-active: #f1f5f9;
    --surface-disabled: #e2e8f0;
    
    /* Text colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;
    --text-disabled: #cbd5e1;
    --text-inverse: #ffffff;
    
    /* Border colors */
    --border-default: #e2e8f0;
    --border-light: #f1f5f9;
    --border-focus: var(--clr-primary);
    
    /* Shadow */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Form elements */
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    --input-placeholder: #9ca3af;
    --input-focus-ring: rgba(26, 130, 195, 0.2);
    
    /* Status colors */
    --status-success: #10b981;
    --status-success-bg: #ecfdf5;
    --status-warning: #f59e0b;
    --status-warning-bg: #fffbeb;
    --status-error: #ef4444;
    --status-error-bg: #fef2f2;
    --status-info: #3b82f6;
    --status-info-bg: #eff6ff;
    
    /* Navigation */
    --nav-bg: #ffffff;
    --nav-text: #475569;
    --nav-hover-bg: rgba(26, 130, 195, 0.08);
    --nav-active-bg: rgba(26, 130, 195, 0.12);
    
    /* Dropdown */
    --dropdown-bg: #ffffff;
    --dropdown-border: #f0f0f0;
    --dropdown-shadow: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.08);
    --dropdown-hover-bg: #f8fafc;
    
    /* Table */
    --table-header-bg: #f8fafc;
    --table-row-hover: #f8fafc;
    --table-stripe-bg: #fafbfc;
    
    /* Scrollbar */
    --scrollbar-track: #f1f5f9;
    --scrollbar-thumb: #cbd5e1;
    --scrollbar-thumb-hover: #94a3b8;
}

/* ============================================
   DARK THEME
   ============================================ */
[data-theme="dark"] {
    /* Use dark variants of brand colors if client defined them */
    --clr-primary: var(--clr-primary-dark);
    --clr-secondary: var(--clr-secondary-dark);
    
    /* Use dark variants of section colors */
    --sec-speaking: var(--sec-speaking-dark);
    --sec-reading: var(--sec-reading-dark);
    --sec-writing: var(--sec-writing-dark);
    --sec-listening: var(--sec-listening-dark);
    
    /* Status colors - dark mode adjustments */
    --success-fg: #4ade80;
    --success-bg: rgba(22, 101, 52, 0.2);
    --success-br: #166534;
    
    --danger-fg: #f87171;
    --danger-bg: rgba(220, 38, 38, 0.15);
    --danger-br: #991b1b;
    
    --warning-fg: #fbbf24;
    --warning-bg: rgba(234, 88, 12, 0.15);
    --warning-br: #c2410c;
    
    /* Background colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-elevated: #1e293b;
    --bg-overlay: rgba(0, 0, 0, 0.7);
    
    /* Surface colors */
    --surface-card: #1e293b;
    --surface-hover: #334155;
    --surface-active: #475569;
    --surface-disabled: #334155;
    
    /* Text colors */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-muted: #64748b;
    --text-disabled: #475569;
    --text-inverse: #0f172a;
    
    /* Border colors */
    --border-default: #334155;
    --border-light: #1e293b;
    --border-focus: var(--clr-primary);
    
    /* Shadow - more subtle in dark mode */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    
    /* Form elements */
    --input-bg: #1e293b;
    --input-border: #475569;
    --input-placeholder: #64748b;
    --input-focus-ring: rgba(26, 130, 195, 0.3);
    
    /* Status colors - slightly adjusted for dark mode */
    --status-success: #34d399;
    --status-success-bg: rgba(16, 185, 129, 0.15);
    --status-warning: #fbbf24;
    --status-warning-bg: rgba(245, 158, 11, 0.15);
    --status-error: #f87171;
    --status-error-bg: rgba(239, 68, 68, 0.15);
    --status-info: #60a5fa;
    --status-info-bg: rgba(59, 130, 246, 0.15);
    
    /* Navigation */
    --nav-bg: #1e293b;
    --nav-text: #cbd5e1;
    --nav-hover-bg: rgba(26, 130, 195, 0.15);
    --nav-active-bg: rgba(26, 130, 195, 0.2);
    
    /* Dropdown */
    --dropdown-bg: #1e293b;
    --dropdown-border: #334155;
    --dropdown-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);
    --dropdown-hover-bg: #334155;
    
    /* Table */
    --table-header-bg: #1e293b;
    --table-row-hover: #334155;
    --table-stripe-bg: rgba(30, 41, 59, 0.5);
    
    /* Scrollbar */
    --scrollbar-track: #1e293b;
    --scrollbar-thumb: #475569;
    --scrollbar-thumb-hover: #64748b;
}

/* ============================================
   SYSTEM PREFERENCE DETECTION (fallback)
   ============================================ */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        /* Background colors */
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-elevated: #1e293b;
        --bg-overlay: rgba(0, 0, 0, 0.7);
        
        /* Surface colors */
        --surface-card: #1e293b;
        --surface-hover: #334155;
        --surface-active: #475569;
        --surface-disabled: #334155;
        
        /* Text colors */
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-tertiary: #94a3b8;
        --text-muted: #64748b;
        --text-disabled: #475569;
        --text-inverse: #0f172a;
        
        /* Border colors */
        --border-default: #334155;
        --border-light: #1e293b;
        
        /* Form elements */
        --input-bg: #1e293b;
        --input-border: #475569;
        --input-placeholder: #64748b;
    }
}

/* ============================================
   BASE ELEMENT STYLING WITH THEME VARIABLES
   ============================================ */

/* Body */
body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Cards */
.card,
.panel,
.well,
.x_panel {
    background-color: var(--surface-card);
    border-color: var(--border-default);
    color: var(--text-primary);
}

/* Form controls */
.form-control,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="url"],
input[type="search"],
textarea,
select {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-primary);
}

.form-control::placeholder,
input::placeholder,
textarea::placeholder {
    color: var(--input-placeholder);
}

.form-control:focus,
input:focus,
textarea:focus,
select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--input-focus-ring);
}

/* Tables */
.table {
    color: var(--text-primary);
}

.table > thead > tr > th {
    background-color: var(--table-header-bg);
    border-color: var(--border-default);
    color: var(--text-secondary);
}

.table > tbody > tr > td {
    border-color: var(--border-default);
}

.table-striped > tbody > tr:nth-of-type(odd) {
    background-color: var(--table-stripe-bg);
}

.table-hover > tbody > tr:hover {
    background-color: var(--table-row-hover);
}

/* Dropdowns */
.dropdown-menu {
    background-color: var(--dropdown-bg);
    border-color: var(--dropdown-border);
    box-shadow: var(--dropdown-shadow);
}

.dropdown-menu > li > a {
    color: var(--text-secondary);
}

.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus {
    background-color: var(--dropdown-hover-bg);
    color: var(--text-primary);
}

/* Alerts */
.alert-success {
    background-color: var(--status-success-bg);
    border-color: var(--status-success);
    color: var(--status-success);
}

.alert-warning {
    background-color: var(--status-warning-bg);
    border-color: var(--status-warning);
    color: var(--status-warning);
}

.alert-danger,
.alert-error {
    background-color: var(--status-error-bg);
    border-color: var(--status-error);
    color: var(--status-error);
}

.alert-info {
    background-color: var(--status-info-bg);
    border-color: var(--status-info);
    color: var(--status-info);
}

/* Modal */
.modal-content {
    background-color: var(--bg-elevated);
    border-color: var(--border-default);
}

.modal-header {
    border-bottom-color: var(--border-default);
}

.modal-footer {
    border-top-color: var(--border-default);
}

/* Navbar */
.navbar,
.nav_menu {
    background-color: var(--nav-bg);
    border-color: var(--border-default);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Theme transition for smooth switching */
* {
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

/* Disable transitions on page load */
.no-transitions * {
    transition: none !important;
}

/* ============================================
   THEME TOGGLE BUTTON STYLES
   ============================================ */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: 8px;
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.theme-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--input-focus-ring);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
    transform: rotate(15deg);
}

/* Sun icon (shown in dark mode) */
.theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: none;
}

/* Moon icon (shown in light mode) */
.theme-toggle .icon-moon {
    display: block;
}

/* ============================================
   DARK MODE OVERRIDES FOR CUSTOM.CSS
   Override hardcoded colors from custom.css
   ============================================ */

/* Main app container body backgrounds */
[data-theme="dark"] body,
[data-theme="dark"] body.nav-md,
[data-theme="dark"] body.nav-sm {
    background: var(--bg-primary) !important;
    color: var(--text-primary) !important;
}

/* Right column (main content area) */
[data-theme="dark"] body .container.body .right_col,
[data-theme="dark"] .right_col {
    background: var(--bg-primary) !important;
    border-left-color: var(--border-default) !important;
}

/* Left column / sidebar */
[data-theme="dark"] body .container.body .left_col,
[data-theme="dark"] .left_col,
[data-theme="dark"] .col-md-3.left_col {
    background: var(--bg-secondary) !important;
}

/* Container body */
[data-theme="dark"] .container.body {
    background: var(--bg-primary) !important;
}

/* Main container */
[data-theme="dark"] .main_container {
    background: var(--bg-primary) !important;
}

/* Top navigation */
[data-theme="dark"] .top_nav,
[data-theme="dark"] .nav_menu {
    background: var(--nav-bg) !important;
    border-color: var(--border-default) !important;
}

[data-theme="dark"] .top_nav .nav_menu {
    background: var(--nav-bg) !important;
}

/* Navigation links */
[data-theme="dark"] .top_nav .nav_menu nav > ul.nav.navbar-nav > li > a,
[data-theme="dark"] .top_nav .nav_menu nav > ul.navbar-right > li > a {
    color: var(--nav-text) !important;
}

[data-theme="dark"] .top_nav .nav_menu nav > ul.nav.navbar-nav > li > a:hover,
[data-theme="dark"] .top_nav .nav_menu nav > ul.nav.navbar-nav > li > a:focus {
    color: var(--clr-primary) !important;
    background-color: var(--nav-hover-bg) !important;
}

[data-theme="dark"] .top_nav .nav_menu nav > ul.nav.navbar-nav > li.open > a,
[data-theme="dark"] .top_nav .nav_menu nav > ul.nav.navbar-nav > li.active > a {
    color: var(--clr-primary) !important;
    background-color: var(--nav-active-bg) !important;
}

/* Dropdown menus in nav */
[data-theme="dark"] .top_nav .dropdown-menu {
    background: var(--dropdown-bg) !important;
    border-color: var(--dropdown-border) !important;
}

[data-theme="dark"] .top_nav .dropdown-menu > li > a {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .top_nav .dropdown-menu > li > a:hover {
    background: var(--dropdown-hover-bg) !important;
    color: var(--text-primary) !important;
}

/* Mega menu */
[data-theme="dark"] .top_nav .dropdown-menu.mega-menu {
    background: var(--dropdown-bg) !important;
    border-color: var(--dropdown-border) !important;
}

/* Menu badge styles moved to theme-overrides.css for section-specific colors */

/* x_panel (common widget container) */
[data-theme="dark"] .x_panel {
    background: var(--surface-card) !important;
    border-color: var(--border-default) !important;
}

[data-theme="dark"] .x_title {
    border-bottom-color: var(--border-default) !important;
}

[data-theme="dark"] .x_title h2 {
    color: var(--text-primary) !important;
}

/* Profile panel */
[data-theme="dark"] .profile_info h2 {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .profile_info span {
    color: var(--text-secondary) !important;
}

/* Footer */
[data-theme="dark"] footer {
    background: var(--bg-secondary) !important;
    border-top-color: var(--border-default) !important;
    color: var(--text-muted) !important;
}

/* Breadcrumbs */
[data-theme="dark"] .breadcrumb {
    background: var(--bg-tertiary) !important;
}

[data-theme="dark"] .breadcrumb > li + li::before,
[data-theme="dark"] .breadcrumb > li > a {
    color: var(--text-secondary) !important;
}

/* Page title */
[data-theme="dark"] .page-title h3 {
    color: var(--text-primary) !important;
}

/* Tiles/Dashboard cards */
[data-theme="dark"] .tile,
[data-theme="dark"] .tile-stats {
    background: var(--surface-card) !important;
    border-color: var(--border-default) !important;
}

[data-theme="dark"] .tile h3,
[data-theme="dark"] .tile-stats h3 {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .tile p,
[data-theme="dark"] .tile-stats p {
    color: var(--text-secondary) !important;
}

/* Sidebar menu */
[data-theme="dark"] .menu_section h3 {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .nav.side-menu > li > a {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .nav.side-menu > li > a:hover,
[data-theme="dark"] .nav.side-menu > li.active > a {
    background: var(--nav-hover-bg) !important;
    color: var(--text-primary) !important;
}

/* Profile area in sidebar */
[data-theme="dark"] .profile {
    background: var(--bg-tertiary) !important;
}

/* Labels and badges */
[data-theme="dark"] .label-default {
    background: var(--bg-tertiary) !important;
    color: var(--text-secondary) !important;
}

/* List groups */
[data-theme="dark"] .list-group-item {
    background: var(--surface-card) !important;
    border-color: var(--border-default) !important;
    color: var(--text-primary) !important;
}

[data-theme="dark"] .list-group-item:hover {
    background: var(--surface-hover) !important;
}

/* Progress bars container */
[data-theme="dark"] .progress {
    background: var(--bg-tertiary) !important;
}

/* Jumbotron */
[data-theme="dark"] .jumbotron {
    background: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
}

/* Code blocks */
[data-theme="dark"] pre,
[data-theme="dark"] code {
    background: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-default) !important;
}

/* Horizontal rules */
[data-theme="dark"] hr {
    border-color: var(--border-default) !important;
}

/* Popover */
[data-theme="dark"] .popover {
    background: var(--surface-card) !important;
    border-color: var(--border-default) !important;
}

[data-theme="dark"] .popover-title {
    background: var(--bg-secondary) !important;
    border-bottom-color: var(--border-default) !important;
    color: var(--text-primary) !important;
}

[data-theme="dark"] .popover-content {
    color: var(--text-secondary) !important;
}

/* Tooltip */
[data-theme="dark"] .tooltip-inner {
    background: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
}

/* Notification dropdown */
[data-theme="dark"] .msg_list li a {
    background: var(--surface-card) !important;
    border-bottom-color: var(--border-default) !important;
}

[data-theme="dark"] .msg_list li a:hover {
    background: var(--surface-hover) !important;
}

[data-theme="dark"] .msg_list li a .message {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .msg_list li a .time {
    color: var(--text-muted) !important;
}