:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --background: #0f172a;
    --surface: #1e293b;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(15, 23, 42, 0.6);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.btn-logout {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.btn-logout:hover {
    color: var(--text);
}

/* Base Buttons */
.btn-primary {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.4);
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.5);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
}

.hero {
    margin-top: 2rem;
    animation: fadeIn 0.8s ease-out;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.2rem;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* App Interface */
.app-interface {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    text-align: left;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

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

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

.input-group input,
.input-group textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.8rem;
    color: var(--text);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.helper-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* Ad Spaces */
.ad-container {
    padding: 1rem;
    display: flex;
    justify-content: center;
}

.ad-placeholder {
    width: 100%;
    max-width: 728px;
    height: 90px;
    background: rgba(255,255,255,0.05);
    border: 2px dashed rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    border-radius: 8px;
}

.footer-ad {
    margin-bottom: 1rem;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--glass-border);
}

/* Functionality Styles */
.hidden {
    display: none;
}

.results-area {
    margin-top: 2rem;
    border-top: 1px solid var(--glass-border);
    padding-top: 2rem;
}

.results-area h3 {
    margin-bottom: 1rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.generated-link {
    display: block;
    background: var(--surface);
    border: 1px solid var(--glass-border);
    padding: 1rem;
    border-radius: 8px;
    color: var(--primary-color);
    text-decoration: none;
    text-align: center;
    transition: all 0.2s;
}

.generated-link:hover {
    background: var(--glass-border);
    color: white;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}