/**
 * WebTools - Main Stylesheet
 *
 * @package WebTools
 * @version 1.0.0
 */

/* ========================================
   CSS Variables & Theme
   ======================================== */

:root {
    /* Light theme colors */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-hover: #f1f5f9;
    --color-text: #0f172a;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 60px;
    --spacing-unit: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

[data-theme="dark"] {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-surface-hover: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ========================================
   Layout Structure
   ======================================== */

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

/* Header */
.header {
    height: var(--header-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base);
}

.header-content {
    height: 100%;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 100%;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* Main Layout */
.main-layout {
    display: flex;
    flex: 1;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    transition: transform var(--transition-base), background-color var(--transition-base);
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background-color var(--transition-fast);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--color-surface-hover);
}

.nav-item.active {
    background-color: var(--color-surface-hover);
    border-left-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: 500;
}

.nav-item-sub {
    padding-left: 3rem;
    font-size: 0.9375rem;
}

.nav-icon {
    font-size: 1.125rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background-color: var(--color-background);
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem;
    text-align: center;
    transition: background-color var(--transition-base);
}

.footer-content {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-note {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
}

/* ========================================
   Components
   ======================================== */

/* Buttons */
.btn, .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    text-decoration: none;
}

.btn:hover, .icon-btn:hover {
    background-color: var(--color-primary-hover);
}

.icon-btn {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    background-color: transparent;
    color: var(--color-text);
    border-radius: 0.5rem;
}

.icon-btn:hover {
    background-color: var(--color-surface-hover);
}

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

.btn-secondary:hover {
    background-color: var(--color-surface-hover);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 1rem;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.hero-note {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* Tools Grid */
.tools-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.tool-category {
    margin-bottom: 2rem;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.category-icon {
    font-size: 1.75rem;
}

.category-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text);
}

.category-description {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.tool-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.tool-card {
    display: block;
    padding: 1.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.tool-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.tool-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.tool-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
    padding: 2rem 0;
}

.feature-card {
    text-align: center;
    padding: 2rem 1rem;
}

.feature-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* Tool Page Layout */
.tool-header {
    margin-bottom: 2rem;
}

.tool-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.tool-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

.tool-container {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: 2rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.form-textarea, .form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9375rem;
    background-color: var(--color-background);
    color: var(--color-text);
    resize: vertical;
    transition: border-color var(--transition-fast);
}

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

.form-textarea {
    min-height: 150px;
}

/* Button Group */
.btn-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

/* Theme Toggle */
.theme-icon {
    font-size: 1.25rem;
}

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

/* Mobile Menu */
.mobile-only {
    display: none;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        bottom: 0;
        z-index: 90;
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        padding: 1rem;
    }

    .mobile-only {
        display: flex;
    }

    .hero h1 {
        font-size: 1.875rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .tool-list {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Language Switcher */
.language-switcher {
    position: relative;
}

.lang-icon {
    font-size: 1.25rem;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    display: none;
    z-index: 1000;
}

.lang-dropdown.show {
    display: block;
}

.lang-option {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background-color var(--transition-fast);
    border-bottom: 1px solid var(--color-border);
}

.lang-option:last-child {
    border-bottom: none;
}

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

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