/* ========================================
   TRADUS - 清新简洁设计系统
   ========================================
   Design: Modern, Clean, Minimal
   Color: Professional Blue & White
   ======================================== */

/* CSS Variables - Clean Color Palette */
:root {
    /* Primary Colors */
    --primary: #0066FF;
    --primary-light: #E8F0FF;
    --primary-dark: #0052CC;

    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFB;
    --bg-tertiary: #F1F5F9;

    /* Text Colors */
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-tertiary: #94A3B8;

    /* Semantic Colors */
    --success: #10B981;
    --success-light: #D1FAE5;
    --error: #EF4444;
    --error-light: #FEE2E2;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --info: #3B82F6;
    --info-light: #DBEAFE;

    /* Borders */
    --border: #E2E8F0;
    --border-light: #F1F5F9;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Typography */
    --font-xs: 11px;
    --font-sm: 13px;
    --font-base: 14px;
    --font-md: 16px;
    --font-lg: 18px;
    --font-xl: 24px;
    --font-2xl: 28px;
    --font-3xl: 32px;
}

/* ========================================
   RESET & BASE
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

html, body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-base);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: var(--font-3xl); }
h2 { font-size: var(--font-2xl); }
h3 { font-size: var(--font-xl); }

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

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

/* ========================================
   UTILITY CLASSES
   ======================================== */

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

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.text-warning { color: var(--warning); }

.font-bold { font-weight: 600; }
.font-semibold { font-weight: 500; }

/* ========================================
   COMPONENTS
   ======================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.btn-secondary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

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

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

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

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

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

/* Cards */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: all 0.2s;
}

.card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: var(--success-light);
    color: var(--success);
}

.badge-error {
    background: var(--error-light);
    color: var(--error);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

.badge-info {
    background: var(--info-light);
    color: var(--info);
}

.badge-neutral {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* Tables */
.table-container {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background: var(--bg-tertiary);
    padding: 14px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 14px 16px;
    font-size: 13px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
}

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

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

/* Input Fields */
.input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.2s;
}

.input:focus {
    outline: none;
    background: var(--bg-primary);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

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

/* Spinner */
.spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   LAYOUT
   ======================================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.page-title {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Grid Layout */
.grid {
    display: grid;
    gap: 16px;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 14px 24px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

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

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
    :root {
        --font-xl: 20px;
        --font-2xl: 24px;
        --font-3xl: 28px;
    }

    .container {
        padding: 20px 16px;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .tabs {
        overflow-x: auto;
    }

    .tab {
        padding: 10px 16px;
        font-size: 13px;
        white-space: nowrap;
    }

    .table-container {
        overflow-x: auto;
    }

    table {
        min-width: 800px;
    }
}

@media (max-width: 480px) {
    :root {
        --font-xl: 18px;
        --font-2xl: 20px;
        --font-3xl: 24px;
    }
}

/* ========================================
   SCROLLBAR
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Selection */
::selection {
    background: var(--primary-light);
    color: var(--primary);
}

/* Focus */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}