:root {
    --primary: #4F46E5; /* Indigo */
    --primary-hover: #4338CA;
    --bg-color: #0F172A; /* Slate 900 for modern dark mode */
    --card-bg: rgba(30, 41, 59, 0.7); /* Slate 800 with transparency for glassmorphism */
    --card-border: rgba(255, 255, 255, 0.1);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border-color: #334155;
    --success: #10B981;
    --error: #EF4444;
    --input-bg: #1E293B;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

/* Auth Pages */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top, #1E1B4B, var(--bg-color));
}

.auth-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.auth-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 40px 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.logo-text {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 24px;
}

.auth-card h2 {
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.auth-card .subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-danger {
    background-color: transparent;
    color: var(--error);
    border: 1px solid var(--error);
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-danger:hover {
    background-color: var(--error);
    color: white;
}

.btn-block {
    width: 100%;
}

.auth-footer {
    margin-top: 24px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    text-align: left;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #FCA5A5;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: #6EE7B7;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Dashboard */
.navbar {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    padding: 16px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

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

.logout-link:hover {
    color: white;
}

.dashboard-container {
    padding: 40px 5%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

.dashboard-header {
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.dashboard-header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.add-backlink-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 40px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.add-backlink-form {
    display: flex;
    gap: 16px;
    align-items: flex-end;
}

.add-backlink-form .form-group {
    flex: 1;
    margin-bottom: 0;
}

#feedback-message {
    margin-top: 16px;
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Table Controls */
.table-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 16px;
}

.search-input {
    background: var(--input-bg) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="%2394A3B8" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"></circle><line x1="21" y1="21" x2="16.65" y2="16.65"></line></svg>') no-repeat 12px center;
    padding: 10px 16px 10px 36px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: white;
    width: 300px;
}

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

/* Table Styles */
.table-container {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background-color: rgba(30, 41, 59, 0.9);
    padding: 16px 20px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
}

th:hover {
    color: white;
}

td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

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

tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.domain-cell {
    font-weight: 600;
    color: white;
}

.url-cell {
    max-width: 300px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-muted);
}

.url-cell a {
    color: var(--text-muted);
}

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

.date-cell {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .add-backlink-form {
        flex-direction: column;
        align-items: stretch;
    }
    .search-input {
        width: 100%;
    }
}