/* ===================================
   Tailwind Class Sorter & Cleaner - Styles
   Modern, Clean Design with Responsive Layout
   =================================== */

/* === CSS Variables === */
:root {
    /* Brand Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: #dbeafe;

    /* Neutrals */
    --color-background: #ffffff;
    --color-surface: #f9fafb;
    --color-border: #e5e7eb;
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;

    /* Functional Colors */
    --color-success: #10b981;
    --color-error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* 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);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

/* === Reset & Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* === Header === */
.site-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1d4ed8 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
    text-align: center;
}

.site-logo {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    text-decoration: none;
    opacity: 0.95;
    transition: opacity var(--transition-fast);
}

.site-logo:hover {
    opacity: 1;
}

.tool-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* === Main Content === */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* === Tool Introduction === */
.tool-intro {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.intro-text {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 42rem;
    margin: 0 auto;
}

/* === Tool Interface === */
.tool-interface {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.editor-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* === Editor Panel === */
.editor-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-sm);
}

.panel-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* === Code Editor === */
.code-editor {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    resize: vertical;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.code-editor:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.code-editor::placeholder {
    color: var(--color-text-muted);
}

.output-area {
    background-color: #fafafa;
    cursor: default;
}

/* === Buttons === */
button {
    font-family: var(--font-sans);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Clear Button */
.btn-clear,
.btn-copy {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background: transparent;
    border-radius: var(--radius-sm);
}

.btn-clear:hover,
.btn-copy:hover {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
}

/* Primary Action Button */
.action-section {
    display: flex;
    justify-content: center;
    padding-top: var(--spacing-md);
}

.btn-primary {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    color: white;
    background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 200px;
    justify-content: center;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

/* === Content Section (SEO Article) === */
.content-section {
    max-width: 48rem;
    margin: 0 auto;
}

.content-block {
    margin-bottom: var(--spacing-2xl);
}

.content-block h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--color-primary);
}

.content-block p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

/* === Footer === */
.site-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.site-footer p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.site-footer a {
    color: var(--color-primary);
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

.footer-note {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* === Toast Notification === */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-text-primary);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(1rem);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

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

/* Tablet and Desktop */
@media (min-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .tool-title {
        font-size: 2rem;
    }

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

    .code-editor {
        min-height: 300px;
    }
}

@media (min-width: 1024px) {
    .code-editor {
        min-height: 400px;
    }

    .tool-interface {
        padding: var(--spacing-2xl);
    }
}

/* Mobile Optimization */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .site-header {
        padding: var(--spacing-md) 0;
    }

    .tool-title {
        font-size: 1.25rem;
    }

    .tool-interface {
        padding: var(--spacing-md);
    }

    .btn-primary {
        width: 100%;
    }

    .toast {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        left: var(--spacing-md);
    }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .code-editor {
        border-width: 3px;
    }

    button {
        border: 2px solid currentColor;
    }
}

/* === Tool Article Section (Added for SEO) === */
.tool-article-section {
    background-color: #ffffff;
    color: #333333;
    padding: 40px 20px;
    margin-top: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.tool-article-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #111;
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.tool-article-section h2:first-child {
    margin-top: 0;
}

.tool-article-section p {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: #333;
}

.tool-article-section code {
    background-color: var(--color-surface);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--color-primary);
}

.tool-article-section dl {
    margin-top: 1.5rem;
}

.tool-article-section dt {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #111;
    font-size: 1.1rem;
}

.tool-article-section dd {
    margin-left: 0;
    margin-bottom: 2rem;
    color: #333;
}