:root {
    --primary-1: #e8f3ff;
    --primary-2: #bedaff;
    --primary-3: #94bfff;
    --primary-4: #6aa3ff;
    --primary-5: #4080ff;
    --primary-6: #165dff;
    --primary-7: #0e42d2;
    --primary-8: #072ca6;
    --primary-9: #03197a;
    --primary-10: #000d4d;
    
    --success-1: #e8ffea;
    --success-2: #b8f5c5;
    --success-3: #7be188;
    --success-4: #44d35b;
    --success-5: #18bc34;
    --success-6: #00b42a;
    --success-7: #009a24;
    --success-8: #008118;
    --success-9: #00680f;
    --success-10: #004006;
    
    --danger-1: #ffece8;
    --danger-2: #fdcdc5;
    --danger-3: #fba37e;
    --danger-4: #f97b56;
    --danger-5: #f75a3c;
    --danger-6: #f53f3f;
    --danger-7: #cb2e2e;
    --danger-8: #a11f1f;
    --danger-9: #771313;
    --danger-10: #4d0909;
    
    --warning-1: #fff7e8;
    --warning-2: #ffe4ba;
    --warning-3: #ffcf8b;
    --warning-4: #ffb65d;
    --warning-5: #ff9a2e;
    --warning-6: #ff7d00;
    --warning-7: #d96800;
    --warning-8: #b35400;
    --warning-9: #8c4200;
    --warning-10: #662f00;
    
    --gray-1: #f7f8fa;
    --gray-2: #f2f3f5;
    --gray-3: #e5e6eb;
    --gray-4: #c9cdd4;
    --gray-5: #a9aeb8;
    --gray-6: #86909c;
    --gray-7: #6b7785;
    --gray-8: #4e5969;
    --gray-9: #272e3b;
    --gray-10: #1d2129;
    
    --color-bg: #f7f8fa;
    --color-bg-1: #ffffff;
    --color-bg-2: #f7f8fa;
    --color-bg-3: #f2f3f5;
    --color-bg-4: #e5e6eb;
    --color-bg-5: #c9cdd4;
    
    --color-text-1: #1d2129;
    --color-text-2: #4e5969;
    --color-text-3: #86909c;
    --color-text-4: #c9cdd4;
    
    --color-border: #e5e6eb;
    --color-border-1: #f2f3f5;
    --color-border-2: #e5e6eb;
    --color-border-3: #c9cdd4;
    --color-border-4: #a9aeb8;
    
    --border-radius: 4px;
    --border-radius-small: 2px;
    --border-radius-medium: 6px;
    --border-radius-large: 8px;
    --border-radius-circle: 50%;
    
    --shadow-1: 0 2px 5px rgba(0, 0, 0, 0.08);
    --shadow-2: 0 4px 10px rgba(0, 0, 0, 0.1);
    --shadow-3: 0 6px 20px rgba(0, 0, 0, 0.12);
    
    --transition-duration-1: 0.1s;
    --transition-duration-2: 0.2s;
    --transition-duration-3: 0.3s;
    --transition-timing-function: cubic-bezier(0.34, 0.69, 0.1, 1);
    
    --font-family: Inter, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-body: 14px;
    --line-height-base: 1.5715;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--primary-6) 0%, #722ed1 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-1);
    font-size: var(--font-size-body);
    line-height: var(--line-height-base);
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 20px;
}

.card {
    background: var(--color-bg-1);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-3);
    padding: 40px;
    margin-bottom: 20px;
}

.card-header {
    text-align: center;
    margin-bottom: 32px;
}

.card-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-1);
    margin-bottom: 8px;
}

.card-header p {
    color: var(--color-text-3);
    font-size: 14px;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-1);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    outline: none;
    transition: all var(--transition-duration-1) var(--transition-timing-function);
    background: var(--color-bg-1);
    color: var(--color-text-1);
    line-height: 1.5;
}

.form-control:hover {
    border-color: var(--primary-5);
}

.form-control:focus {
    border-color: var(--primary-6);
    box-shadow: 0 0 0 2px var(--primary-1);
}

.form-control::placeholder {
    color: var(--color-text-4);
}

.form-control:disabled {
    background: var(--color-bg-2);
    color: var(--color-text-4);
    cursor: not-allowed;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 400;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-duration-1) var(--transition-timing-function);
    text-decoration: none;
    gap: 6px;
    line-height: 1.5;
    white-space: nowrap;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-6) 0%, #722ed1 100%);
    color: #fff;
    border-color: transparent;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(22, 93, 255, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-bg-1);
    color: var(--color-text-1);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-2);
    border-color: var(--primary-6);
    color: var(--primary-6);
}

.btn-success {
    background: var(--success-6);
    color: #fff;
    border-color: var(--success-6);
}

.btn-success:hover:not(:disabled) {
    background: var(--success-5);
    border-color: var(--success-5);
}

.btn-danger {
    background: var(--danger-6);
    color: #fff;
    border-color: var(--danger-6);
}

.btn-danger:hover:not(:disabled) {
    background: var(--danger-5);
    border-color: var(--danger-5);
}

.btn-warning {
    background: var(--warning-6);
    color: #fff;
    border-color: var(--warning-6);
}

.btn-warning:hover:not(:disabled) {
    background: var(--warning-5);
    border-color: var(--warning-5);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.result-box {
    background: var(--color-bg-2);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 20px;
}

.result-box h3 {
    font-size: 14px;
    color: var(--color-text-3);
    margin-bottom: 12px;
}

.short-url {
    display: flex;
    align-items: center;
    gap: 10px;
}

.short-url input {
    flex: 1;
    padding: 10px 14px;
    font-size: 16px;
    font-weight: 500;
    color: var(--primary-6);
    background: var(--color-bg-1);
    border: 2px solid var(--primary-6);
    border-radius: var(--border-radius);
    outline: none;
}

.short-url .btn {
    width: auto;
    padding: 10px 20px;
}

.alert {
    padding: 10px 16px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.alert-success {
    background: var(--success-1);
    color: var(--success-6);
    border: 1px solid var(--success-2);
}

.alert-error {
    background: var(--danger-1);
    color: var(--danger-6);
    border: 1px solid var(--danger-2);
}

.alert-warning {
    background: var(--warning-1);
    color: var(--warning-6);
    border: 1px solid var(--warning-2);
}

.alert-info {
    background: var(--primary-1);
    color: var(--primary-6);
    border: 1px solid var(--primary-2);
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-3);
}

.text-success {
    color: var(--success-6);
}

.text-danger {
    color: var(--danger-6);
}

.text-warning {
    color: var(--warning-6);
}

.text-primary {
    color: var(--primary-6);
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

.mb-10 {
    margin-bottom: 10px;
}

.mb-20 {
    margin-bottom: 20px;
}

.icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 6px;
    vertical-align: middle;
}

.footer {
    text-align: center;
    padding: 20px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
}

.footer a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color var(--transition-duration-1) var(--transition-timing-function);
}

.footer a:hover {
    text-decoration: underline;
    color: #fff;
}

.quote-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 40px 20px;
}

.quote-card {
    background: var(--color-bg-1);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-3);
    padding: 60px 80px;
    text-align: center;
    max-width: 800px;
}

.quote-text {
    font-size: 24px;
    font-weight: 500;
    color: var(--color-text-1);
    line-height: 1.6;
    margin-bottom: 24px;
}

.quote-date {
    font-size: 14px;
    color: var(--color-text-3);
}

@media (max-width: 480px) {
    .card {
        padding: 24px;
    }
    
    .card-header h1 {
        font-size: 20px;
    }
    
    .short-url {
        flex-direction: column;
    }
    
    .short-url .btn {
        width: 100%;
    }
    
    .quote-card {
        padding: 40px 24px;
    }
    
    .quote-text {
        font-size: 18px;
    }
}