:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --max-width: 1280px;

    /* Colors for card icons */
    --blue-icon: #eff6ff;
    --blue-text: #3b82f6;
    --purple-icon: #f5f3ff;
    --purple-text: #8b5cf6;
    --green-icon: #f0fdf4;
    --green-text: #22c55e;
    --orange-icon: #fff7ed;
    --orange-text: #f97316;
    --pink-icon: #fdf2f8;
    --pink-text: #ec4899;
    --indigo-icon: #eef2ff;
    --indigo-text: #6366f1;
    --red-icon: #fef2f2;
    --red-text: #ef4444;
    --cyan-icon: #ecfeff;
    --cyan-text: #06b6d4;
    --yellow-icon: #fefce8;
    --yellow-text: #eab308;
}

[data-theme="dark"] {
    --bg-light: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    
    /* Dark mode icons background */
    --blue-icon: #1e3a8a;
    --purple-icon: #4c1d95;
    --green-icon: #064e3b;
    --orange-icon: #7c2d12;
    --pink-icon: #831843;
    --indigo-icon: #312e81;
    --red-icon: #7f1d1d;
    --cyan-icon: #164e63;
    --yellow-icon: #713f12;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* Navbar */
.navbar {
    height: 80px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.container-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.logo h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.icon-btn {
    background: none;
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--bg-light);
    color: var(--text-main);
}

.login-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    background: var(--bg-card);
    border: 1px solid var(--primary);
    color: var(--primary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.login-btn:hover {
    background: var(--primary);
    color: white;
}

/* Hero */
.hero {
    padding: 4rem 0 2rem;
    text-align: center;
}

.hero-subtitle {
    font-family: 'Outfit', sans-serif;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Tools Grid */
.tools-grid-section {
    padding: 2rem 0 4rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    border: 1px solid var(--border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none;
    box-shadow: var(--shadow);
}

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

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-icon i {
    width: 24px;
    height: 24px;
}

.card-content h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.card-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Card Icon Colors Variation */
.blue { background-color: var(--blue-icon); color: var(--blue-text); }
.purple { background-color: var(--purple-icon); color: var(--purple-text); }
.green { background-color: var(--green-icon); color: var(--green-text); }
.orange { background-color: var(--orange-icon); color: var(--orange-text); }
.pink { background-color: var(--pink-icon); color: var(--pink-text); }
.indigo { background-color: var(--indigo-icon); color: var(--indigo-text); }
.red { background-color: var(--red-icon); color: var(--red-text); }
.cyan { background-color: var(--cyan-icon); color: var(--cyan-text); }
.yellow { background-color: var(--yellow-icon); color: var(--yellow-text); }

/* Theme Toggle Icons */
#theme-toggle .sun-icon { display: block; }
#theme-toggle .moon-icon { display: none; }

[data-theme="dark"] #theme-toggle .sun-icon { display: none; }
[data-theme="dark"] #theme-toggle .moon-icon { display: block; }

/* Footer */
.footer {
    margin-top: auto;
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 1rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary);
}

.tool-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    min-height: 500px;
}

.tool-input-group, 
.tool-output-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.tool-label {
    font-weight: 500;
    color: var(--text-main);
}

.tool-field {
    width: 100%;
    flex-grow: 1;
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.tool-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s;
}

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--bg-light);
}

.disabled {
    opacity: 0.6;
    cursor: not-allowed !important;
    pointer-events: none;
}

/* Responsive Tool */
@media (max-width: 960px) {
    .tool-layout {
        grid-template-columns: 1fr;
    }
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 0 1rem;
    }
    .hero {
        padding: 2rem 0;
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
}