:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #0ea5e9;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 20px 40px -5px rgba(99, 102, 241, 0.15);
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: -1;
}

.page-bg::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to bottom, transparent, var(--bg));
}

.main-content {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 24px 40px;
    width: 100%;
}

.page-header {
    text-align: center;
    margin-bottom: 48px;
}

.page-header .logo {
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    letter-spacing: -1px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
    margin-bottom: 8px;
}

.page-header .subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
}

.nav-grid {
    display: grid;
    gap: 16px;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 28px;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.nav-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.nav-item-text {
    flex: 1;
}

.nav-item-text h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.nav-item-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.nav-item-arrow {
    color: var(--text-light);
    font-size: 14px;
    transition: var(--transition);
}

.nav-item:hover .nav-item-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

.lockout-msg {
    background: #fef2f2;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 14px;
    border: 1px solid #fecaca;
}

.error-message {
    background: #fef2f2;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 14px;
    border: 1px solid #fecaca;
    align-items: center;
    gap: 8px;
    justify-content: center;
}

.login-page {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 24px 40px;
}

.login-wrapper {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.login-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin: 0 auto 24px;
}

.login-title {
    font-size: 1.75rem;
    font-weight: 800;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}

.login-form {
    margin-bottom: 24px;
}

.input-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border);
    border-radius: 14px;
    font-size: 16px;
    transition: var(--transition);
    background: var(--bg);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    border: none;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px -5px rgba(99, 102, 241, 0.4);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary);
}

.admin-nav {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-nav-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-logo span:first-child {
    font-size: 20px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.admin-logout {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.admin-logout:hover {
    color: var(--primary);
}

.admin-page {
    flex: 1;
    padding: 48px 24px 40px;
}

.admin-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.admin-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    gap: 16px;
    flex-wrap: wrap;
}

.admin-header-bar h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.admin-header-bar p {
    color: var(--text-secondary);
    font-size: 14px;
}

.admin-actions {
    display: flex;
    gap: 10px;
}

.btn-save {
    padding: 10px 24px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.btn-save:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px -5px rgba(99, 102, 241, 0.4);
}

.btn-save:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-add-sm {
    padding: 10px 18px;
    background: var(--bg);
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn-add-sm:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.toast {
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
    text-align: center;
}

.toast-success {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

.toast-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.sites-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.sites-table thead th {
    background: var(--bg);
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}

.sites-table tbody td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.sites-table tbody tr:last-child td {
    border-bottom: none;
}

.sites-table tbody tr:hover td {
    background: rgba(99, 102, 241, 0.03);
}

.row-num {
    color: var(--text-light);
    font-size: 13px;
    font-weight: 600;
    text-align: center;
}

.row-drag {
    color: var(--text-light);
    cursor: grab;
    text-align: center;
    font-size: 14px;
}

.row-drag:active {
    cursor: grabbing;
}

.sites-table tbody tr[draggable="true"] {
    cursor: grab;
}

.sites-table tbody tr[draggable="true"]:active {
    cursor: grabbing;
}

.table-input {
    width: 100%;
    padding: 8px 12px;
    border: 1.5px solid transparent;
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
    background: transparent;
    color: var(--text-primary);
}

.table-input:hover {
    background: var(--bg);
}

.table-input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

.btn-del-sm {
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-del-sm:hover {
    background: #fef2f2;
    color: #dc2626;
}

@media (max-width: 640px) {
    .main-content {
        padding: 48px 16px 32px;
    }

    .page-header .logo {
        font-size: 2.5rem;
    }

    .page-header .subtitle {
        font-size: 1rem;
    }

    .nav-item {
        padding: 20px;
    }

    .nav-item-text h3 {
        font-size: 1rem;
    }

    .login-card {
        padding: 36px 28px;
    }

    .admin-header-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .sites-table {
        display: block;
        overflow-x: auto;
    }
}