:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --input-bg: #ffffff;
    --radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-main: #020617;
    --bg-card: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1e293b;
    --input-bg: #1e293b;
    --primary-light: #312e81;
    --shadow: 0 20px 25px -5px rgb(0 0 0 / 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    transition: background-color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

[data-theme="dark"] header {
    background-color: rgba(15, 23, 42, 0.8);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.025em;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition);
}

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

.theme-toggle {
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

main {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: 1.25rem;
    background: linear-gradient(to right, var(--primary), #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Dynamic Search Bar */
.search-container {
    margin: 2.5rem auto;
    max-width: 640px;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1.25rem 1.25rem 1.25rem 3.5rem;
    border: 1px solid var(--border);
    border-radius: 16px;
    background-color: var(--bg-card);
    color: var(--text-main);
    font-size: 1.125rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    width: 24px;
    height: 24px;
}

/* Categories & Grid */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.tool-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-decoration: none;
    color: var(--text-main);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary);
    opacity: 0;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

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

.tool-icon {
    width: 48px;
    height: 48px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.tool-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Tool Detail Page */
.tool-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
}

.tool-main-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
}

.breadcrumb {
    display: flex;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

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

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

.input-group label {
    display: block;
    margin-bottom: 0.625rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-main);
}

.input-field {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background-color: var(--bg-main);
    color: var(--text-main);
    font-size: 1rem;
    transition: var(--transition);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    background-color: var(--bg-card);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 0.875rem 1.75rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
    width: 100%;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.result-container {
    margin-top: 2.5rem;
}

.result-box {
    background-color: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9375rem;
    min-height: 120px;
    position: relative;
    white-space: pre-wrap;
    word-break: break-all;
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    background: var(--bg-card);
}

/* Sidebar Ads/Related */
.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ad-card {
    background: linear-gradient(135deg, var(--primary), #818cf8);
    color: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
}

/* Responsive */
@media (max-width: 1024px) {
    .tool-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .nav-links {
        display: none;
    }
}