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

:root {
    --primary: #0066CC;
    --primary-dark: #0052A3;
    --primary-darker: #003D7A;
    --primary-light: #E6F2FF;
    --primary-lighter: #F0F7FF;
    --primary-accent: #0080FF;
    
    --blue-50: #F0F7FF;
    --blue-100: #E6F2FF;
    --blue-200: #CCE5FF;
    --blue-300: #99CCFF;
    --blue-400: #66B3FF;
    --blue-500: #3399FF;
    --blue-600: #0080FF;
    --blue-700: #0066CC;
    --blue-800: #0052A3;
    --blue-900: #003D7A;
    
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F0F7FF;
    
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-tertiary: #64748B;
    --text-inverse: #FFFFFF;
    
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0, 102, 204, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 102, 204, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 102, 204, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 102, 204, 0.20);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 17px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 0.5px solid var(--blue-200);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 102, 204, 0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-800) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition-fast);
    position: relative;
    padding: var(--spacing-sm) 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition-fast);
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--border-color);
    transition: var(--transition-fast);
}

.avatar:hover {
    border-color: var(--blue-500);
    transform: scale(1.05);
    box-shadow: 0 0 0 3px var(--blue-100);
}

.avatar-sm {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.page-header h1 {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    color: var(--text-tertiary);
    font-size: 15px;
    margin-top: var(--spacing-xs);
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    font-size: 17px;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-700) 100%);
    color: var(--text-inverse);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.25);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--blue-700) 0%, var(--blue-800) 100%);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.35);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--blue-700);
    border: 1.5px solid var(--blue-300);
}

.btn-secondary:hover {
    background: var(--blue-50);
    border-color: var(--blue-500);
    color: var(--blue-800);
}

.btn-danger {
    background: var(--danger);
    color: var(--text-inverse);
}

.btn-danger:hover {
    background: #E6342A;
    transform: translateY(-1px);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 15px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 19px;
    border-radius: var(--radius-lg);
}

.btn-link {
    background: none;
    color: var(--primary);
    text-decoration: none;
    padding: 0;
    font-weight: 500;
}

.btn-link:hover {
    text-decoration: underline;
}

.btn-google-landing {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.btn-google-landing:hover {
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--blue-500);
}

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
    border: 1px solid var(--blue-100);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--blue-300);
}

.card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.group-card {
    cursor: pointer;
}

.group-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--blue-100);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--blue-300);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.section-header:first-of-type {
    margin-top: 0;
}

.section-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin: 0;
}

.section-count {
    font-size: 14px;
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.group-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.group-card-enhanced {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--blue-100);
    transition: var(--transition);
    cursor: pointer;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.group-card-enhanced:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-300);
}

.group-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.group-info-main {
    flex: 1;
}

.group-info-main h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.3px;
}

.group-description {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

.group-icon {
    font-size: 32px;
    flex-shrink: 0;
    opacity: 0.7;
}

.group-stats-mini {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-top: 0.5px solid var(--border-color);
    border-bottom: 0.5px solid var(--border-color);
}

.group-stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
}

.group-stat-icon {
    font-size: 16px;
    opacity: 0.7;
}

.group-stat-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

.group-stat-label {
    font-size: 13px;
    color: var(--text-tertiary);
}

.group-balance {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
}

.group-balance.balanced {
    background: var(--blue-50);
}

.group-balance.owed {
    background: #F0FDF4;
    border-left: 4px solid var(--success);
}

.group-balance.owes {
    background: #FEF2F2;
    border-left: 4px solid var(--danger);
}

.balance-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.balance-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.group-balance.owed .balance-label {
    color: var(--success);
}

.group-balance.owes .balance-label {
    color: var(--danger);
}

.balance-amount {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.group-balance.owed .balance-amount {
    color: var(--success);
}

.group-balance.owes .balance-amount {
    color: var(--danger);
}

.balance-arrow {
    font-size: 20px;
    color: var(--text-tertiary);
    opacity: 0.5;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--blue-100);
    margin: var(--spacing-xl) 0;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
    display: inline-block;
}

.empty-state h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.5px;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.notifications-card {
    margin-top: var(--spacing-lg);
}

.notification-item {
    position: relative;
    padding-left: var(--spacing-md);
}

.notification-dot {
    position: absolute;
    left: 0;
    top: var(--spacing-md);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--blue-600);
}

.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.group-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 0.5px solid var(--border-color);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 17px;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--blue-600);
    box-shadow: 0 0 0 4px var(--blue-100);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.table th,
.table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 0.5px solid var(--border-color);
}

.table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.members-list {
    list-style: none;
}

.members-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 0.5px solid var(--border-color);
    transition: var(--transition-fast);
}

.members-list li:last-child {
    border-bottom: none;
}

.members-list li:hover {
    padding-left: var(--spacing-sm);
}

.debts-list {
    list-style: none;
}

.debts-list li {
    padding: var(--spacing-md);
    border-bottom: 0.5px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.debts-list li:hover {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.debts-list li:last-child {
    border-bottom: none;
}

.amount {
    font-weight: 700;
    color: var(--blue-700);
    font-size: 18px;
}

.notification-link {
    position: relative;
}

.notification-link .badge {
    position: absolute;
    top: -8px;
    right: -12px;
    background: var(--danger);
    color: var(--text-inverse);
    font-size: 11px;
    padding: 4px 8px;
    min-width: 20px;
    justify-content: center;
}

.notification-list {
    list-style: none;
}

.notification-item {
    padding: var(--spacing-md);
    border-bottom: 0.5px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.notification-item:hover {
    background: var(--bg-secondary);
}

.notification-item.unread {
    background: var(--blue-50);
    border-left: 4px solid var(--blue-600);
}

.notification-item:last-child {
    border-bottom: none;
}

.notification-content {
    flex: 1;
}

.notification-content strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 600;
}

.notification-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-size: 15px;
}

.notification-content small {
    color: var(--text-tertiary);
    font-size: 13px;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-tertiary);
}

.empty-state p {
    font-size: 17px;
    margin-bottom: var(--spacing-lg);
}

.error-page {
    text-align: center;
    padding: var(--spacing-2xl);
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.error-page h1 {
    font-size: 72px;
    font-weight: 700;
    color: var(--danger);
    margin-bottom: var(--spacing-md);
    letter-spacing: -2px;
}

.error-page p {
    font-size: 19px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: var(--spacing-lg);
}

.auth-card {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 420px;
    width: 100%;
    text-align: center;
    border: 0.5px solid var(--border-color);
}

.auth-card h1 {
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-800) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -1px;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 17px;
}

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 15px;
}

.alert-error {
    background: #FFF5F5;
    color: var(--danger);
    border: 1px solid #FFE5E5;
}

.group-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.member-split-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    background: var(--bg-primary);
    transition: var(--transition-fast);
}

.member-split-item:hover {
    border-color: var(--blue-400);
    box-shadow: var(--shadow-sm);
    background: var(--blue-50);
}

.member-split-item label {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
}

.split-input {
    width: 150px;
}

.split-input input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
}

.suggested-payments {
    background: var(--blue-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 1.5px solid var(--blue-400);
}

.suggested-payments h3 {
    margin-bottom: var(--spacing-md);
    font-size: 17px;
    color: var(--blue-700);
    font-weight: 600;
}

.suggested-payments ul {
    list-style: none;
}

.suggested-payments li {
    padding: var(--spacing-sm) 0;
}

.suggested-payments a {
    color: var(--blue-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.suggested-payments a:hover {
    text-decoration: underline;
    color: var(--blue-800);
}

.footer {
    background: var(--bg-primary);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    border-top: 0.5px solid var(--border-color);
    font-size: 15px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 0.5px solid var(--border-color);
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-800) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.footer-description {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
    margin: 0;
}

.footer-heading {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.3px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links li {
    margin: 0;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 15px;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--blue-600);
    transform: translateX(4px);
}

.footer-bottom {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
    padding-top: var(--spacing-md);
}

.footer-bottom p {
    margin: 0;
}

.landing-page {
    min-height: calc(100vh - 200px);
}

.legal-page {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
    background: var(--bg-secondary);
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--blue-100);
}

.legal-content h1 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -1px;
}

.legal-updated {
    color: var(--text-tertiary);
    font-size: 14px;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 0.5px solid var(--border-color);
}

.legal-content section {
    margin-bottom: var(--spacing-xl);
}

.legal-content section:last-child {
    margin-bottom: 0;
}

.legal-content h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
    letter-spacing: -0.5px;
}

.legal-content h2:first-of-type {
    margin-top: 0;
}

.legal-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    font-size: 16px;
}

.legal-content ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
    color: var(--text-secondary);
    line-height: 1.8;
}

.legal-content li {
    margin-bottom: var(--spacing-sm);
    font-size: 16px;
}

.legal-content a {
    color: var(--blue-600);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.legal-content a:hover {
    color: var(--blue-700);
    text-decoration: underline;
}

.hero {
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-800) 50%, var(--blue-900) 100%);
    color: var(--text-inverse);
    padding: 120px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
    letter-spacing: -2px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    font-weight: 400;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-note {
    margin-top: var(--spacing-lg);
    font-size: 15px;
    opacity: 0.9;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.features {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-primary);
}

.section-title {
    text-align: center;
    font-size: 40px;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -1.5px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    background: var(--blue-50);
    border: 1px solid var(--blue-200);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-primary);
    border-color: var(--blue-400);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon {
    animation-delay: 0.5s;
}

.feature-card:nth-child(3) .feature-icon {
    animation-delay: 1s;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: var(--spacing-md);
    color: var(--blue-700);
    font-weight: 700;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 16px;
}

.use-cases {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-secondary);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.use-case-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--blue-100);
    transition: var(--transition);
}

.use-case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-300);
}

.use-case-card h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 700;
}

.use-case-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 16px;
}

.cta-section {
    background: linear-gradient(135deg, var(--blue-700) 0%, var(--blue-800) 50%, var(--blue-900) 100%);
    color: var(--text-inverse);
    padding: var(--spacing-2xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: 40px;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    letter-spacing: -1.5px;
}

.cta-section p {
    font-size: 19px;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-xl) 0;
        gap: var(--spacing-md);
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

    .page-header h1 {
        font-size: 28px;
    }

    .header-actions {
        width: 100%;
        flex-direction: column;
    }

    .header-actions .btn {
        width: 100%;
    }

    .groups-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }

    .stat-value {
        font-size: 24px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .group-info {
        grid-template-columns: 1fr;
    }

    .table {
        font-size: 15px;
        display: block;
        overflow-x: auto;
    }

    .table th,
    .table td {
        padding: var(--spacing-sm);
        white-space: nowrap;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .member-split-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .split-input {
        width: 100%;
    }

    .auth-card {
        padding: var(--spacing-xl);
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .cta-section h2 {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-section {
        align-items: center;
    }

    .footer-links {
        align-items: center;
    }

    .legal-content {
        padding: var(--spacing-lg);
    }

    .legal-content h1 {
        font-size: 28px;
    }

    .legal-content h2 {
        font-size: 20px;
    }
}

.text-muted {
    color: var(--text-tertiary);
}

a {
    color: var(--blue-600);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--blue-700);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.5px;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--blue-600);
}

select {
    cursor: pointer;
}

button:disabled,
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .card {
        padding: var(--spacing-md);
    }

    .page-header h1 {
        font-size: 24px;
    }

    .hero {
        padding: 80px 0;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .features,
    .use-cases,
    .cta-section {
        padding: var(--spacing-xl) 0;
    }

    .section-title {
        font-size: 24px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .group-stats-mini {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}