:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --dark: #0f172a;
    --dark-lighter: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #22c55e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    background-color: var(--dark);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Nav */
nav {
    height: 80px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

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

/* Hero */
header {
    padding: 100px 0;
    text-align: center;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

h1 span { color: var(--primary); }

header p {
    color: var(--text-muted);
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 40px;
}

/* Card Shortener */
.card-shortener {
    background: var(--dark-lighter);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255,255,255,0.05);
}

.input-group {
    margin-bottom: 15px;
}

input[type="url"], input[type="text"] {
    width: 100%;
    padding: 15px 20px;
    border-radius: 12px;
    border: 2px solid transparent;
    background: var(--dark);
    color: white;
    font-size: 1rem;
    transition: 0.3s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
}

.custom-options {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.prefix {
    background: var(--dark);
    padding: 15px;
    border-radius: 12px 0 0 12px;
    color: var(--text-muted);
    border: 2px solid transparent;
    border-right: none;
}

button {
    width: 100%;
    padding: 15px;
    border-radius: 12px;
    border: none;
    background: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

/* Results */
.result-area {
    margin-top: 30px;
    animation: fadeIn 0.5s ease;
}

.hidden { display: none; }

.result-card {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--accent);
    padding: 20px;
    border-radius: 15px;
}

.result-link {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

#shortUrl {
    background: rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
}

#btnCopy {
    background: var(--accent);
    width: auto;
    padding: 0 25px;
}

/* Features */
.features {
    padding: 80px 0;
    background: rgba(255,255,255,0.02);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 15px;
}

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

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
}