/* ============================================
   Dongshandao V2 - Base Styles
   Theme Colors:
     Primary:   #0A5C7A
     Secondary: #1A9CB0
     Accent:    #FF6B4A
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #0A5C7A;
  --color-primary-dark: #07445C;
  --color-primary-light: #1A7A9E;
  --color-secondary: #1A9CB0;
  --color-secondary-dark: #147E8F;
  --color-secondary-light: #3CB9CC;
  --color-accent: #FF6B4A;
  --color-accent-dark: #E55535;
  --color-accent-light: #FF8A6F;

  --color-text: #2C3E50;
  --color-text-light: #6B7C8A;
  --color-text-lighter: #95A5A6;
  --color-bg: #F5F7FA;
  --color-bg-white: #FFFFFF;
  --color-bg-gray: #ECF0F1;
  --color-border: #D5DDE5;
  --color-border-light: #E8EDF2;
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-error: #E74C3C;

  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;

  --line-height: 1.6;
  --line-height-tight: 1.3;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-base: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 50%;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.15);

  --transition: 0.3s ease;
  --transition-fast: 0.15s ease;

  --container-max: 1200px;
  --header-height: 72px;
}

/* --- CSS Reset --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

article, aside, details, figcaption, figure,
footer, header, hgroup, main, nav, section {
  display: block;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

p {
  margin-bottom: var(--spacing-base);
  color: var(--color-text);
}

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

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

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

strong, b { font-weight: 600; }
em, i { font-style: italic; }

small { font-size: var(--font-size-sm); }

/* --- Lists --- */
ul, ol {
  margin-bottom: var(--spacing-base);
  padding-left: var(--spacing-xl);
}

li { margin-bottom: var(--spacing-xs); }

/* --- Images --- */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

figure { margin-bottom: var(--spacing-base); }

figcaption {
  font-size: var(--font-size-sm);
  color: var(--color-text-lighter);
  text-align: center;
  margin-top: var(--spacing-sm);
}

/* --- Tables --- */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-base);
}

th, td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  background-color: var(--color-bg-gray);
  color: var(--color-text);
}

/* --- Form Elements --- */
input, textarea, select, button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(10, 92, 122, 0.15);
}

/* --- Accessibility --- */
.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;
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-lighter); }
.font-bold { font-weight: 600; }
.font-normal { font-weight: 400; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-block { display: inline-block; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }
.mt-base { margin-top: var(--spacing-base); }
.mb-base { margin-bottom: var(--spacing-base); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* --- Clearfix --- */
.clearfix::after {
  content: '';
  display: table;
  clear: both;
}

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-text-lighter);
  border-radius: var(--radius-sm);
}

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