/**
 * QuickToolsHub - Universal Design System
 * Version: 2.0
 * Description: Complete CSS framework for all QuickToolsHub tools
 * Author: QuickToolsHub Team
 * Last Updated: 2025-01-13
 */

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

:root {
    /* === Primary Colors === */
    --color-primary: #4361ee;           /* Main brand color - tech blue */
    --color-primary-dark: #3a0ca3;      /* Secondary - deep blue for hover */
    --color-primary-light: #4cc9f0;     /* Light blue for accents */

    /* === Background Colors === */
    --bg-primary: #f8f9fa;              /* Main page background */
    --bg-secondary: #ffffff;            /* Card/panel background */
    --bg-tertiary: #e9ecef;             /* Footer/background accents */
    --bg-surface: #ffffff;              /* Surface/overlay background */

    /* === Text Colors === */
    --text-primary: #212529;            /* Headings, body text */
    --text-secondary: #6c757d;          /* Descriptions, subtitles */
    --text-tertiary: #adb5bd;           /* Disabled state */

    /* === Functional Colors === */
    --color-success: #4cc9f0;           /* Success state */
    --color-warning: #f72585;           /* Warning, errors */
    --color-info: #4361ee;              /* Information */
    --color-disabled: #adb5bd;          /* Disabled state */

    /* === Border Colors === */
    --border: #dee2e6;                  /* Default border color */
    --border-light: #f1f3f5;            /* Light border for separators */

    /* === Shadows === */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.15);

    /* === Spacing System === */
    --space-xs: 0.25rem;    /* 4px */
    --space-sm: 0.5rem;     /* 8px */
    --space-md: 1rem;       /* 16px */
    --space-lg: 1.5rem;     /* 24px */
    --space-xl: 2rem;       /* 32px */
    --space-2xl: 3rem;      /* 48px */
    --space-3xl: 4rem;      /* 64px */

    /* === Border Radius === */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-full: 9999px;   /* Pill shape */

    /* === Typography === */
    --font-xs: 0.75rem;      /* 12px */
    --font-sm: 0.875rem;     /* 14px */
    --font-base: 1rem;       /* 16px */
    --font-lg: 1.125rem;     /* 18px */
    --font-xl: 1.25rem;      /* 20px */
    --font-2xl: 1.5rem;      /* 24px */
    --font-3xl: 2rem;        /* 32px */
    --font-4xl: 2.5rem;      /* 40px */

    /* === Transitions === */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* === Layout === */
    --container-max-width: 1200px;
    --header-height: 70px;
    --footer-height: auto;
}

/* ============================================================
   CSS RESET & BASE STYLES
   ============================================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

h1 { font-size: var(--font-3xl); }
h2 { font-size: var(--font-2xl); }
h3 { font-size: var(--font-xl); }
h4 { font-size: var(--font-lg); }
h5 { font-size: var(--font-base); }
h6 { font-size: var(--font-sm); }

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--space-md);
}

/* Grid System */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--space-md));
}

.col {
    flex: 1;
    padding: 0 var(--space-md);
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 800;
    font-size: var(--font-xl);
    transition: opacity var(--transition-fast);
}

.site-logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-lg);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-title {
    font-size: var(--font-xl);
    font-weight: 800;
}

.logo-tagline {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    font-weight: 500;
}

/* Navigation */
.nav-item {
    display: flex;
    align-items: center;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--bg-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    font-weight: 500;
}

.lang-option {
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.lang-option:hover {
    color: var(--color-primary);
}

.lang-option.active {
    color: var(--color-primary);
    font-weight: 600;
}

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

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ============================================================
   MAIN CONTENT AREA
   ============================================================ */

.site-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-2xl) 0;
    min-height: calc(100vh - var(--header-height));
}

.main-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
    width: 100%;
}

/* ============================================================
   TOOL PANEL DESIGN
   ============================================================ */

.tool-panel {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: fadeInUp var(--transition-slow) ease-out;
}

/* Panel Header */
.panel-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--bg-tertiary);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.panel-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-2xl);
    flex-shrink: 0;
}

.panel-info {
    flex: 1;
}

.panel-title {
    font-size: var(--font-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.panel-description {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin: 0;
}

/* Panel Body */
.panel-body {
    padding: var(--space-xl);
}

/* Panel Sections */
.panel-section {
    margin-bottom: var(--space-xl);
}

.panel-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: var(--font-lg);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

/* ============================================================
   INPUT AREAS & UPLOAD ZONES
   ============================================================ */

.upload-zone {
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-3xl);
    text-align: center;
    background-color: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.upload-zone:hover {
    border-style: solid;
    background-color: rgba(67, 97, 238, 0.02);
    transform: translateY(-2px);
}

.upload-zone.drag-over {
    border-color: var(--color-primary-dark);
    background-color: rgba(67, 97, 238, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    font-size: var(--font-4xl);
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.upload-title {
    font-size: var(--font-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.upload-subtitle {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

/* Form Controls */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.form-control {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-base);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-control:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

/* Range Slider */
.range-slider {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
    background: var(--color-primary-dark);
    transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.range-slider::-moz-range-thumb:hover {
    background: var(--color-primary-dark);
    transform: scale(1.2);
}

/* Checkbox */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.form-check-input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-check-label {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

/* ============================================================
   BUTTONS & CONTROLS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-base);
    font-weight: 600;
    line-height: 1.5;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    user-select: none;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--bg-tertiary);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--color-success), var(--color-primary));
    color: white;
}

.btn-danger {
    background-color: var(--color-warning);
    color: white;
}

/* Loading State */
.btn-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* Button Group */
.btn-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ============================================================
   OUTPUT & RESULTS AREA
   ============================================================ */

.results-area {
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--bg-tertiary);
    animation: fadeInUp var(--transition-slow) ease-out;
}

/* Comparison Cards */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.comparison-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.comparison-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-label {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-md);
}

.card-value {
    font-size: var(--font-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.card-subvalue {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

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

.stat-item {
    background-color: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.stat-label {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.stat-value {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
}

.badge.success {
    background-color: rgba(76, 201, 240, 0.1);
    color: var(--color-success);
}

.badge.warning {
    background-color: rgba(247, 37, 133, 0.1);
    color: var(--color-warning);
}

/* ============================================================
   PROGRESS INDICATORS
   ============================================================ */

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(67, 97, 238, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
    background-color: var(--bg-tertiary);
    padding: var(--space-2xl) 0 var(--space-xl);
    margin-top: auto;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.footer-section h4 {
    font-size: var(--font-base);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: var(--font-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    font-size: var(--font-sm);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.fade-in-up {
    animation: fadeInUp var(--transition-slow) ease-out;
}

/* ============================================================
   ADVERTISEMENT PLACEHOLDERS
   ============================================================ */

.ad-container {
    background-color: var(--bg-secondary);
    border: 2px dashed var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-sm);
    margin: var(--space-xl) 0;
}

.ad-container::before {
    content: 'Advertisement Space';
    font-weight: 600;
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-md);
    }

    .panel-header {
        flex-direction: column;
        text-align: center;
    }

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

@media (max-width: 768px) {
    /* Header */
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

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

    .language-switcher {
        display: none;
    }

    /* Mobile Dropdown */
    .mobile-menu .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        max-height: none;
    }

    /* Main Content */
    .site-main {
        padding: var(--space-lg) 0;
    }

    /* Panel */
    .panel-header,
    .panel-body {
        padding: var(--space-lg);
    }

    .panel-title {
        font-size: var(--font-xl);
    }

    /* Buttons */
    .btn {
        width: 100%;
    }

    .btn-group {
        flex-direction: column;
    }

    /* Upload Zone */
    .upload-zone {
        padding: var(--space-xl);
    }

    .upload-icon {
        font-size: var(--font-3xl);
    }

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

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }

    .logo-icon {
        width: 36px;
        height: 36px;
    }

    .panel-title {
        font-size: var(--font-lg);
    }

    .card-value {
        font-size: var(--font-2xl);
    }
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-sm); }
.p-2 { padding: var(--space-md); }
.p-3 { padding: var(--space-lg); }
.p-4 { padding: var(--space-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .btn,
    .upload-zone {
        display: none !important;
    }

    .tool-panel {
        box-shadow: none;
    }
}

/* ==================== Header Dropdown Menu ==================== */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    background: transparent;
    border: 1px solid transparent;
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.dropdown-toggle:hover,
.dropdown-toggle:focus {
    background: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
    border-color: rgba(99, 102, 241, 0.2);
}

.dropdown-toggle .fa-chevron-down {
    transition: transform var(--transition-fast);
}

.dropdown.active .dropdown-toggle .fa-chevron-down {
    transform: rotate(180deg);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), 0 2px 8px rgba(0, 0, 0, 0.1);
    min-width: 220px;
    max-height: 450px;
    overflow-y: auto;
    z-index: 1000;
    padding: var(--space-sm) 0;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.dropdown.active .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-fast);
    font-size: var(--font-sm);
    white-space: nowrap;
}

.dropdown-item span {
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.dropdown-item:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
}

.dropdown-item i {
    color: var(--color-primary);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.dropdown-item:hover i {
    opacity: 1;
}

/* ==================== Footer 3-Column Layout ==================== */
.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}