:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --danger: #ef4444;
    --success: #22c55e;
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: radial-gradient(circle at top right, #1e1b4b, transparent 40%),
                      radial-gradient(circle at bottom left, #312e81, transparent 40%);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: var(--glass-border);
    margin-bottom: 40px;
}

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

.logo img {
    height: 40px;
    width: auto;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
    transition: all 0.2s;
}

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: rgba(99, 102, 241, 0.1);
}

.btn-sm {
    padding: 5px 10px;
    font-size: 0.85rem;
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.btn-copy {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-copy:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary);
    color: white;
}

/* Main Content */
.hero {
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    line-height: 1.2;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.checkbox-group input {
    margin-top: 4px;
}

.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid transparent;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.2);
    color: #86efac;
}

.result-box {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

.short-url {
    flex-grow: 1;
    font-family: monospace;
    font-size: 1.2rem;
    color: var(--success);
}

/* Dashboard Table */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
}

tr:last-child td {
    border-bottom: none;
}

.long-url {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: inline-block;
    vertical-align: middle;
}

/* Footer */
footer {
    margin-top: auto;
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: var(--glass-border);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 10px;
}

/* Utilities */
.hidden { display: none; }
.w-full { width: 100%; }
.text-center { text-align: center; }

/* Advanced Settings Accordion */
.advanced-toggle {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 15px;
    padding: 0;
}
.advanced-toggle:hover {
    text-decoration: underline;
}
.advanced-section {
    display: none;
    padding: 15px;
    background: rgba(0,0,0,0.15);
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid rgba(255,255,255,0.05);
}
.advanced-section.open {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Password Page */
.password-gate {
    max-width: 400px;
    margin: 50px auto;
    text-align: center;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}