/**
 * EN: Design System Theme Tokens
 * VI: Các token thiết kế cho Design System
 *
 * This file contains all CSS custom properties (variables) for the design system,
 * including colors, typography, spacing, layout, animations, and more.
 * These tokens are used throughout the application and can be referenced in Tailwind CSS
 * utility classes via the tailwind.config.js configuration.
 *
 * File này chứa tất cả các CSS custom properties (biến) cho design system,
 * bao gồm màu sắc, typography, spacing, layout, animations, và nhiều hơn nữa.
 * Các token này được sử dụng trong toàn bộ ứng dụng và có thể được tham chiếu trong
 * các utility classes của Tailwind CSS thông qua cấu hình tailwind.config.js.
 */

:root {
  /* ============================================
     EN: Color Palette - Dark Mode (Primary Theme)
     VI: Bảng màu - Dark Mode (Theme chính)
     ============================================ */

  /* Background Colors / Màu nền */
  --bg-primary: #000000;
  /* Pure black - Main background */
  --bg-secondary: #0A0A0A;
  /* Almost black - Card/Panel background */
  --bg-tertiary: #141414;
  /* Very dark grey - Hover states */
  --bg-elevated: #1A1A1A;
  /* Elevated surfaces (modals, dropdowns) */

  /* Text Colors (WCAG Compliant) / Màu chữ (tuân thủ WCAG) */
  --text-primary: #FFFFFF;
  /* Pure white - Primary text */
  --text-secondary: #B0B0B0;
  /* Lighter grey - Secondary text (Improved contrast) */
  --text-tertiary: #808080;
  /* Mid grey - Tertiary/disabled text (Improved contrast) */
  --text-muted: #505050;
  /* Dark grey - Muted elements */
  --text-inverse: #000000;
  /* Black - Text on light/white backgrounds */

  /* Brand/Accent Colors / Màu thương hiệu/Accent */
  --accent-primary: #FFFFFF;
  /* White - Primary actions (High contrast) */
  --accent-secondary: #333333;
  /* Dark grey - Secondary actions */
  --accent-success: #10B981;
  /* Green - Success states */
  --accent-warning: #F59E0B;
  /* Amber - Warnings */
  --accent-error: #EF4444;
  /* Red - Errors */
  --accent-info: #06B6D4;
  /* Cyan - Info */

  /* Chat Specific Colors / Màu riêng cho Chat */
  --chat-user-bubble: #1A1A1A;
  /* Dark grey - User message */
  --chat-ai-bubble: transparent;
  /* Transparent - AI message (Minimal) */
  --chat-user-text: #FFFFFF;
  /* White text */
  --chat-ai-text: #E5E5E5;
  /* Off-white text */
  --chat-timestamp: #555555;
  /* Dark grey timestamp */
  --chat-divider: #222222;
  /* Divider between messages */

  /* Border Colors / Màu viền */
  --border-primary: #222222;
  /* Subtle borders */
  --border-secondary: #333333;
  /* Hover borders */
  --border-focus: #FFFFFF;
  /* Focus state - White */

  /* ============================================
     EN: Brand Colors (Primary Identity)
     VI: Màu thương hiệu (Nhận diện chính)
     ============================================ */

  /* Primary Brand Color - Main brand identity (Blue - Tech & Trust) */
  --brand-primary: #3B82F6;
  --brand-primary-light: #60A5FA;
  --brand-primary-dark: #2563EB;
  --brand-primary-contrast: #FFFFFF;

  /* Secondary Brand Color - Supporting color (Purple - Innovation) */
  --brand-secondary: #8B5CF6;
  --brand-secondary-light: #A78BFA;
  --brand-secondary-dark: #7C3AED;

  /* Accent Color - Call-to-action (Cyan - Energy) */
  --brand-accent: #06B6D4;
  --brand-accent-light: #22D3EE;
  --brand-accent-dark: #0891B2;

  /* Brand Gradients - For backgrounds and special elements */
  --brand-gradient-primary: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
  --brand-gradient-accent: linear-gradient(135deg, var(--brand-accent) 0%, var(--brand-primary) 100%);
  --brand-gradient-vertical: linear-gradient(180deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);

  /* ============================================
     EN: Glassmorphism Effects
     VI: Hiệu ứng Glassmorphism
     ============================================ */

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-bg-hover: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: 24px;

  /* ============================================
     EN: Extended Shadows & Effects
     VI: Shadows & Effects mở rộng
     ============================================ */

  --shadow-brand: 0 20px 50px rgba(59, 130, 246, 0.15);
  --shadow-brand-lg: 0 30px 70px rgba(59, 130, 246, 0.25);
  --shadow-colored: 0 10px 40px rgba(59, 130, 246, 0.3);

  /* ============================================
     EN: Light Mode Colors (Secondary Theme)
     VI: Màu sắc cho Light Mode (Theme phụ)
     ============================================ */
  --bg-primary-light: #FFFFFF;
  --bg-secondary-light: #FBFBFD;
  /* Apple Gray */
  --bg-tertiary-light: #F5F5F7;
  --text-primary-light: #1D1D1F;
  /* Apple Black */
  --text-secondary-light: #86868B;
  /* Apple Gray Text */
  --border-primary-light: #D2D2D7;

  /* ============================================
     EN: Typography
     VI: Kiểu chữ
     ============================================ */

  /* Font Stack / Bộ font */
  --font-sans: var(--font-inter), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;

  /* Display Font - For hero titles (48px+) */
  --font-display: var(--font-inter), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Heading Font - For section headings (24-36px) */
  --font-heading: var(--font-inter), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Type Scale / Kích thước chữ */
  --text-6xl: 3.75rem;
  /* 60px - Hero titles */
  --text-5xl: 3rem;
  /* 48px - Page titles */
  --text-4xl: 2.25rem;
  /* 36px - Section headers */
  --text-3xl: 1.875rem;
  /* 30px - Card headers */
  --text-2xl: 1.5rem;
  /* 24px - Large body */
  --text-xl: 1.25rem;
  /* 20px - Emphasized text */
  --text-lg: 1.125rem;
  /* 18px - Large body */
  --text-base: 1rem;
  /* 16px - Default body */
  --text-sm: 0.875rem;
  /* 14px - Small text */
  --text-xs: 0.75rem;
  /* 12px - Captions */

  /* Line Heights / Chiều cao dòng */
  --leading-none: 1;
  --leading-tight: 1.1;
  --leading-snug: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Font Weights / Độ đậm chữ */
  --font-thin: 100;
  --font-extralight: 200;
  --font-light: 300;
  /* Light text */
  --font-normal: 400;
  /* Body text */
  --font-medium: 500;
  /* Emphasized */
  --font-semibold: 600;
  /* Headings */
  --font-bold: 700;
  /* Strong emphasis */

  /* ============================================
     EN: Spacing & Layout
     VI: Khoảng cách & Bố cục
     ============================================ */

  /* Base Unit: 4px (0.25rem) / Đơn vị cơ sở: 4px (0.25rem) */
  --space-0: 0;
  --space-1: 0.25rem;
  /* 4px */
  --space-2: 0.5rem;
  /* 8px */
  --space-3: 0.75rem;
  /* 12px */
  --space-4: 1rem;
  /* 16px */
  --space-5: 1.25rem;
  /* 20px */
  --space-6: 1.5rem;
  /* 24px */
  --space-8: 2rem;
  /* 32px */
  --space-10: 2.5rem;
  /* 40px */
  --space-12: 3rem;
  /* 48px */
  --space-16: 4rem;
  /* 64px */
  --space-20: 5rem;
  /* 80px */

  /* Container Widths / Chiều rộng container */
  --container-sm: 640px;
  /* Small devices */
  --container-md: 768px;
  /* Medium devices */
  --container-lg: 1024px;
  /* Large devices */
  --container-xl: 1280px;
  /* Extra large */
  --container-2xl: 1536px;
  /* 2X large */
  --chat-max-width: 800px;
  /* Max width for chat messages */
  --sidebar-width: 280px;
  /* Conversation history sidebar */

  /* Border Radius / Bo góc */
  --radius-sm: 2px;
  /* Small elements - sharp */
  --radius-md: 4px;
  /* Buttons, inputs - sharp */
  --radius-lg: 8px;
  /* Cards - minimal roundness */
  --radius-xl: 12px;
  /* Large cards */
  --radius-2xl: 16px;
  /* Modals */
  --radius-full: 9999px;
  /* Full round - Avatars, pills */

  /* ============================================
     EN: Shadows (Dark Mode Optimized)
     VI: Đổ bóng (Tối ưu cho Dark Mode)
     ============================================ */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.8);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.8);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.9);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.95);
  --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
  /* White glow for focus */

  /* ============================================
     EN: Grid System & Breakpoints
     VI: Hệ thống lưới & Điểm ngắt
     ============================================ */
  --screen-sm: 640px;
  /* Mobile landscape */
  --screen-md: 768px;
  /* Tablet */
  --screen-lg: 1024px;
  /* Desktop */
  --screen-xl: 1280px;
  /* Large desktop */
  --screen-2xl: 1536px;
  /* Extra large desktop */

  /* ============================================
     EN: Animation & Transitions
     VI: Animation & Chuyển tiếp
     ============================================ */

  /* Timing Functions / Hàm thời gian */
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Duration / Thời lượng */
  --duration-fast: 150ms;
  /* Hover effects */
  --duration-normal: 250ms;
  /* Default transitions */
  --duration-slow: 350ms;
  /* Complex animations */
  --duration-slower: 500ms;
  /* Page transitions */

  /* ============================================
     EN: Advanced Motion Tokens
     VI: Token chuyển động nâng cao
     ============================================ */

  /* Motion Ease Functions - For micro-interactions */
  --motion-ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --motion-ease-elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6);

  /* Hover Scale - For interactive elements */
  --hover-scale-sm: 1.02;
  --hover-scale-md: 1.05;
  --hover-scale-lg: 1.1;

  /* Active Scale - For pressed states */
  --active-scale: 0.98;
}

/* ============================================
   EN: Light Mode Theme Overrides
   VI: Ghi đè theme cho Light Mode
   ============================================ */
@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: var(--bg-primary-light);
    --bg-secondary: var(--bg-secondary-light);
    --bg-tertiary: var(--bg-tertiary-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --border-primary: var(--border-primary-light);
  }
}

/* ============================================
   EN: Dark Mode Theme (Explicit)
   VI: Theme Dark Mode (Rõ ràng)
   ============================================ */
[data-theme="dark"],
.dark {
  --bg-primary: #000000;
  --bg-secondary: #0A0A0A;
  --bg-tertiary: #141414;
  --bg-elevated: #1A1A1A;
  --text-primary: #FFFFFF;
  --text-secondary: #B0B0B0;
  --text-tertiary: #808080;
  --text-muted: #505050;
  --border-primary: #222222;
  --border-secondary: #333333;
}

/* ============================================
   EN: Light Mode Theme (Explicit)
   VI: Theme Light Mode (Rõ ràng)
   ============================================ */
[data-theme="light"],
.light {
  --bg-primary: var(--bg-primary-light);
  --bg-secondary: var(--bg-secondary-light);
  --bg-tertiary: var(--bg-tertiary-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --border-primary: var(--border-primary-light);
}