/* 
   SEOToolsk - Modern Design System
   Aesthetic: Sleek, Premium, Dynamic
*/

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette - HSL (Premium Dark Mode First) */
    --primary-h: 230;
    --primary-s: 85%;
    --primary-l: 60%;
    
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-light: hsl(var(--primary-h), var(--primary-s), 75%);
    --primary-dark: hsl(var(--primary-h), var(--primary-s), 45%);
    
    --accent-h: 280;
    --accent: hsl(var(--accent-h), 80%, 65%);
    
    /* Dark Theme (Default) */
    --bg-body: #05070a;
    --bg-card: rgba(22, 27, 34, 0.6);
    --bg-card-hover: rgba(28, 33, 40, 0.8);
    --bg-input: #0d1117;
    
    --text-main: #f0f6fc;
    --text-muted: #8b949e;
    --text-dim: #484f58;
    
    --border: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
    --glass: rgba(13, 17, 23, 0.7);
    --glass-blur: blur(20px);
    
    /* Layout */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    --container-width: 1200px;
    --header-height: 80px;
    
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
[data-theme="light"] {
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-input: #ffffff;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-dim: #94a3b8;
    
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --glass: rgba(255, 255, 255, 0.8);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
}

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

ul {
    list-style: none;
}

button, input, textarea, select {
    font-family: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Layout Components */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Nav */
header {
    height: var(--header-height);
    background: var(--glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-shrink: 0;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

/* Hero Section with Mesh Gradient */
.hero {
    padding: 10rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.15), transparent),
                radial-gradient(circle at 70% 70%, rgba(var(--accent-h), 80%, 65%, 0.1), transparent);
    z-index: -1;
    animation: meshRotate 20s linear infinite;
}

@keyframes meshRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero h1 {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1.3rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 3.5rem;
    font-weight: 400;
}

/* Search Bar */
.search-container {
    max-width: 650px;
    margin: 0 auto;
    position: relative;
    perspective: 1000px;
}

.search-input {
    width: 100%;
    padding: 1.4rem 1.5rem 1.4rem 4rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    color: var(--text-main);
    font-size: 1.2rem;
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary), 0 20px 40px rgba(0, 0, 0, 0.5);
    transform: translateZ(10px);
}

.search-icon {
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.3rem;
    color: var(--primary);
    pointer-events: none;
}

/* Category Filters */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Tool Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

/* Bento Grid Variation */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 200px;
    gap: 1.5rem;
}

.bento-item-large { grid-column: span 2; grid-row: span 2; }
.bento-item-wide { grid-column: span 2; }
.bento-item-tall { grid-row: span 2; }

/* Tool Cards & Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.4); }
    70% { transform: scale(1.02); box-shadow: 0 0 0 10px rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0); }
}

.fade-in {
    animation: fadeInUp 0.6s ease forwards;
}

.tool-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-10px);
    background: var(--bg-card-hover);
    border-color: var(--primary);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(255, 255, 255, 0.05);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.category-tag {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--primary);
    background: rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    width: fit-content;
}

.tool-icon {
    width: 48px;
    height: 48px;
    background: rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    transform: rotate(5deg) scale(1.1);
    color: var(--accent);
    background: rgba(var(--accent-h), 80%, 65%, 0.15);
}

/* Tool Page Layout */
.tool-page-container {
    padding: 8rem 0 4rem;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
}

.tool-main {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.tool-header .breadcrumb {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.tool-header h1 {
    margin-bottom: 1rem;
}

/* Tool UI Box */
.tool-ui-box {
    margin: 2rem 0;
    padding: 2rem;
    background: var(--bg-input);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-main);
}

.tool-input, .tool-output {
    width: 100%;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-main);
    padding: 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

textarea.tool-input {
    min-height: 200px;
}

.tool-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 0 20px rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.4);
}

.btn-primary:active {
    transform: scale(0.95);
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--primary);
    transform: rotate(30deg);
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 4rem 0;
    background: var(--bg-card);
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(2, 1fr);
    gap: 3rem;
}

.footer-bottom {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    color: var(--text-dim);
}

/* File Dropzone */
.file-dropzone {
    width: 100%;
    height: 200px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-body);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.file-dropzone:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-h), var(--primary-s), var(--primary-l), 0.05);
}

/* Responsive */
@media (max-width: 992px) {
    .tool-page-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2.5rem; }
    .footer-grid { grid-template-columns: 1fr; }
}