:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --border-card: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-1: #8b5cf6;
    --accent-2: #c084fc;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #c084fc 100%);
    --accent-glow: rgba(139, 92, 246, 0.3);
    --success: #10b981;
    --danger: #ef4444;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.2);
    --font: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(139,92,246,0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

/* Glass Card */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: var(--shadow-card);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.glass-card:hover {
    border-color: rgba(139, 92, 246, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.3);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Top Nav */
.top-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-card);
}

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

.nav-logo {
    font-size: 1.25rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
}

.upgrade-btn {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.upgrade-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 20px 40px;
    position: relative;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-2);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    letter-spacing: -1.5px;
    margin-bottom: 16px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

/* Tool Navigation Tabs */
.tool-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-card);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    border-color: rgba(255,255,255,0.2);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

/* Main App Layout */
.app-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 28px;
    padding: 0 0 80px;
    align-items: start;
}

.controls-panel {
    position: sticky;
    top: 100px;
}

.panel-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Form Inputs */
.input-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input, .input-group select, .input-group textarea {
    padding: 14px 16px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.input-group textarea {
    resize: vertical;
    min-height: 100px;
}

.input-group input:focus, .input-group select:focus, .input-group textarea:focus {
    border-color: var(--accent-1);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.action-btn.secondary {
    background: transparent;
    border: 1px solid var(--border-card);
    color: var(--text-primary);
    box-shadow: none;
}
.action-btn.secondary:hover {
    border-color: rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
}

/* Results Area */
.result-card {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
    position: relative;
    transition: all 0.3s;
}
.result-card:hover {
    border-color: rgba(255,255,255,0.2);
}

.result-text {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-primary);
    white-space: pre-wrap;
    margin-bottom: 20px;
}

.result-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.icon-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-card);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

/* Tags generator styling */
.tag-badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--accent-2);
    border-radius: 20px;
    margin: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}
.tag-badge:hover {
    background: var(--accent-1);
    color: white;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--success);
    color: #fff;
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Tools container logic */
.tool-section {
    display: none;
}
.tool-section.active {
    display: block;
    animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
    .controls-panel {
        position: static;
    }
}