/* ============================================================
   DESIGN SYSTEM: Modern Professional Minimal - AI Content Tool
   Palette: Slate Blue - Professional, Trustworthy, Clean
   Layout: Workbench - Left sidebar + Center form + Right output
   Spacing: 8px rhythm - 8/16/24/32/48
   Contrast: WCAG AA compliant (4.5:1 for text)
   ============================================================ */

/* ============================================================
   CSS Reset & Base
   ============================================================ */

:root {
    /* Color Palette - Slate Blue Professional */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;

    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;
    --color-warning-500: #f59e0b;
    --color-sidebar-bg: #0f172a;
    --color-sidebar-text: #cbd5e1;
    --color-sidebar-active: #ffffff;
    --color-sidebar-hover: #1e293b;

    /* Spacing Scale (8px base) */
    --spacing-1: 0.25rem; /* 4px */
    --spacing-2: 0.5rem;  /* 8px */
    --spacing-3: 0.75rem; /* 12px */
    --spacing-4: 1rem;    /* 16px */
    --spacing-6: 1.5rem;  /* 24px */
    --spacing-8: 2rem;    /* 32px */
    --spacing-12: 3rem;   /* 48px */
    --spacing-16: 4rem;   /* 64px */

    /* Typography */
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;

    /* Border Radius */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;      /* 16px */

    /* Shadows - Elevation Scale */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;

    /* Workbench Layout */
    --sidebar-width: 200px;
    --form-panel-width: 320px;
}

/* ============================================================
   Global Styles
   ============================================================ */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-gray-50);
    color: var(--color-gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    font-size: var(--text-base);
}

/* Workbench body - no container, full height */
.workbench-body {
    margin: 0;
    padding: 0;
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Flash container for top messages */
.flash-container {
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    min-width: 400px;
    max-width: 90%;
}

/* ============================================================
   Workbench Layout - Three Panels
   ============================================================ */

/* Left Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-sidebar-bg);
    color: var(--color-sidebar-text);
    display: flex;
    flex-direction: column;
    height: 100vh;
    flex-shrink: 0;
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
}

.sidebar-brand {
    padding: var(--spacing-6) var(--spacing-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand h5 {
    margin: 0;
    color: var(--color-sidebar-active);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.sidebar-menu {
    list-style: none;
    padding: var(--spacing-4) 0;
    margin: 0;
    flex: 1;
}

.sidebar-menu li {
    margin: 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--color-sidebar-text);
    text-decoration: none;
    padding: var(--spacing-3) var(--spacing-4);
    transition: background-color var(--transition-base);
    min-height: 48px;
}

.sidebar-menu a:hover {
    background-color: var(--color-sidebar-hover);
    color: var(--color-sidebar-active);
}

.sidebar-menu li.active a {
    background-color: var(--color-primary-600);
    color: #ffffff;
}

.sidebar-footer {
    padding: var(--spacing-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.menu-section-divider {
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    margin: var(--spacing-4) 0;
}

/* Middle Form Panel */
.workbench-panel {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: #ffffff;
    border-right: 1px solid var(--color-gray-200);
    overflow-y: auto;
}

.form-panel {
    width: var(--form-panel-width);
    flex-shrink: 0;
    padding: 12px;
}

.panel-header {
    padding: var(--spacing-4) var(--spacing-4);
    background-color: #ffffff;
    border-bottom: 1px solid var(--color-gray-200);
    flex-shrink: 0;
}

.panel-header h5 {
    margin: 0;
    font-weight: 600;
    color: var(--color-gray-800);
}

.panel-body {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Right Output Panel */
.output-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--color-gray-50);
    height: 100vh;
    overflow: hidden;
}

.output-panel .panel-body {
    flex: 1;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

/* ============================================================
   Navigation (Top navbar for non-workbench pages)
   ============================================================ */

.navbar {
    box-shadow: var(--shadow-md);
    padding-top: var(--spacing-2);
    padding-bottom: var(--spacing-2);
}

.navbar-brand {
    font-weight: 600;
    font-size: var(--text-xl);
    letter-spacing: -0.02em;
}

.navbar-nav .nav-link {
    font-weight: 400;
    padding: var(--spacing-2) var(--spacing-3) !important;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-base);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    font-weight: 500;
}

/* Ensure touch targets meet minimum size requirement */
.navbar .btn,
.navbar .nav-link {
    min-height: 44px;
}

/* ============================================================
   Cards
   ============================================================ */

.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: 0 !important;
}

.card-header h4,
.card-header h5 {
    margin: 0;
    font-weight: 600;
    color: var(--color-gray-800);
    letter-spacing: -0.01em;
}

.card-body {
    padding: var(--spacing-6);
}

/* Login Card */
.login-card {
    margin-top: 10vh;
    box-shadow: var(--shadow-xl);
}

.login-card .card-body {
    padding: var(--spacing-8);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-4);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    letter-spacing: -0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-500) 100%);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-primary-600) 100%);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success-500) 0%, var(--color-success-600) 100%);
    border: none;
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--color-success-600) 0%, #047857 100%);
    transform: translateY(-1px);
}

.btn-outline-primary {
    border-color: var(--color-gray-300);
    color: var(--color-gray-600);
}

.btn-outline-primary:hover {
    background-color: var(--color-primary-500);
    border-color: var(--color-primary-500);
    transform: translateY(-1px);
}

.btn-outline-light {
    border-color: rgba(255, 255, 255, 0.3);
    color: #ffffff;
}

.btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-sm {
    padding: var(--spacing-1) var(--spacing-3);
    min-height: 36px;
    font-size: var(--text-sm);
}

/* ============================================================
   Forms
   ============================================================ */

.form-label {
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-2);
    font-size: var(--text-sm);
}

.form-control,
.form-select {
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-300);
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--text-base);
    color: var(--color-gray-700);
    background-color: #ffffff;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    min-height: 44px;
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-control::placeholder {
    color: var(--color-gray-400);
}

textarea.form-control {
    line-height: 1.6;
    min-height: 100px;
}

/* Required indicator */
.required {
    color: var(--color-danger-500);
    margin-left: var(--spacing-1);
}

/* ============================================================
   Output Area - Generated Content
   ============================================================ */

.output-area {
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: break-word;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.8;
    background: #ffffff;
    padding: var(--spacing-4);
    min-height: 320px;
    color: var(--color-gray-800);
    flex: 1;
}

.output-area:empty:before {
    content: '生成结果将显示在这里...';
    color: var(--color-gray-400);
}

.output-area.has-content {
    background: #ffffff;
}

/* 发单机内容样式 */
.output-line-owner {
    color: var(--color-primary-700);
    font-weight: 500;
}

/* 水军托内容样式 */
.output-line-helper {
    color: var(--color-success-600);
    padding-left: 1em;
    border-left: 3px solid var(--color-success-300);
    margin: 4px 0;
}

/* 图片/视频标注高亮 */
.output-media-tag {
    color: #f59e0b;
    font-weight: 600;
    background-color: #fffbeb;
    padding: 1px 4px;
    border-radius: 3px;
}

/* 标题分隔线样式 */
.output-separator {
    color: var(--color-gray-400);
    letter-spacing: 2px;
}

.output-area-full {
    flex: 1;
    overflow-y: auto;
    border: none !important;
    border-radius: 0;
    min-height: 0;
}

/* ============================================================
   Product Info Panel
   ============================================================ */

.product-info {
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
    padding: var(--spacing-4);
}

.product-info small {
    color: var(--color-gray-500);
    display: inline-block;
    width: 68px;
    font-weight: 500;
    font-size: var(--text-sm);
}

/* ============================================================
   Tables
   ============================================================ */

.table {
    margin-bottom: 0;
}

.table thead th {
    border-bottom: 2px solid var(--color-gray-200);
    color: var(--color-gray-600);
    font-weight: 600;
    font-size: var(--text-sm);
    padding: var(--spacing-3) var(--spacing-4);
    vertical-align: middle;
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background-color: var(--color-gray-50);
}

.table tbody td {
    padding: var(--spacing-3) var(--spacing-4);
    vertical-align: middle;
    border-top: 1px solid var(--color-gray-100);
    color: var(--color-gray-700);
}

.table .btn {
    margin: 0 var(--spacing-1);
}

/* Empty state */
.table-empty {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-4);
    color: var(--color-gray-500);
}

/* ============================================================
   Alerts & Flash Messages
   ============================================================ */

.alert {
    border-radius: var(--radius-md);
    border: none;
    padding: var(--spacing-3) var(--spacing-4);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success-600);
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-danger-600);
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--color-primary-600);
}

/* ============================================================
   Loading
   ============================================================ */

.spinner-border {
    width: 2rem;
    height: 2rem;
    border-width: 3px;
}

/* ============================================================
   Container & Layout (for non-workbench pages)
   ============================================================ */

.container {
    padding-bottom: var(--spacing-12);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1200px) {
    :root {
        --form-panel-width: 280px;
    }
}

@media (max-width: 992px) {
    /* Stack vertically on mobile */
    .workbench-body {
        flex-direction: column;
        height: auto;
        overflow: auto;
    }
    .sidebar {
        width: 100%;
        height: auto;
        min-height: 60px;
    }
    .sidebar-menu {
        display: flex;
        padding: 0;
    }
    .sidebar-footer {
        display: none;
    }
    .workbench-panel {
        height: auto;
    }
    .form-panel {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--color-gray-200);
    }
    .output-panel {
        min-height: 500px;
    }
}

@media (max-width: 768px) {
    .container {
        padding-left: var(--spacing-4);
        padding-right: var(--spacing-4);
        padding-bottom: var(--spacing-8);
    }

    .card-body {
        padding: var(--spacing-4);
    }

    .output-area {
        font-size: 13px;
        padding: var(--spacing-3);
    }

    .flash-container {
        min-width: 90%;
    }
}

/* ============================================================
   Utilities
   ============================================================ */

/* Text contrast utilities */
.text-muted {
    color: var(--color-gray-500) !important;
}

/* Focus styles for accessibility */
.btn:focus,
.form-control:focus {
    outline: none;
}

/* Ensure all interactive elements have visible focus */
.btn:focus-visible,
.form-control:focus-visible,
.nav-link:focus-visible {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3) !important;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Accessibility - hide visually but keep for screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}