/* ============================================
   中健兴康官网 · Base 基础样式
   Reset + Typography + Layout
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 风险提示条常驻后，整体内容下移 */
body.has-risk-bar {
  padding-bottom: var(--risk-bar-height);
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font: inherit;
  color: inherit;
}

/* ============ 排版 ============ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.display {
  font-family: var(--font-serif);
  font-size: var(--text-display);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.h1 {
  font-family: var(--font-serif);
  font-size: var(--text-h1);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  letter-spacing: -0.015em;
}

.h2 {
  font-family: var(--font-serif);
  font-size: var(--text-h2);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
}

.h3 {
  font-family: var(--font-sans);
  font-size: var(--text-h3);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
}

.h4 {
  font-family: var(--font-sans);
  font-size: var(--text-h4);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
}

.lead {
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.body {
  font-size: var(--text-body);
  line-height: var(--leading-normal);
  color: var(--color-text);
}

.small {
  font-size: var(--text-small);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

.caption {
  font-size: var(--text-xs);
  line-height: var(--leading-normal);
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  line-height: 1;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent-deep);
}

.serif {
  font-family: var(--font-serif);
}

.mono {
  font-family: var(--font-mono);
  font-feature-settings: "tnum" 1; /* 表格数字对齐 */
}

.accent {
  color: var(--color-accent-deep);
}

.text-secondary {
  color: var(--color-text-secondary);
}

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

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

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

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

/* ============ 容器 ============ */
.container {
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.container--base {
  max-width: var(--container-base);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

.container--full {
  max-width: var(--container-full);
}

/* ============ 区块 ============ */
.section {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
}

.section--sm {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section--lg {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

.section--dark {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-text-inverse);
}

.section--warm {
  background: var(--color-bg-warm);
}

/* ============ 网格 ============ */
.grid {
  display: grid;
  gap: var(--space-8);
}

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

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

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

@media (max-width: 1024px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* ============ Flex 工具 ============ */
.flex {
  display: flex;
}

.flex--center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex--between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ============ 装饰 ============ */
.divider {
  height: 1px;
  background: var(--color-border);
  border: 0;
  margin: var(--space-8) 0;
}

.divider--accent {
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-accent) 50%,
    transparent 100%);
  height: 1px;
}

.divider--thick {
  height: 2px;
  background: var(--color-primary);
}

/* ============ 选区 ============ */
::selection {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ============ 焦点 ============ */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-deep);
}

/* ============ 图片占位（待补充） ============ */
.placeholder-img {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-warm);
  border: 1px dashed var(--color-border-dark);
  border-radius: var(--radius-md);
  color: var(--color-text-tertiary);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  padding: var(--space-4);
  min-height: 200px;
  position: relative;
  overflow: hidden;
}

.placeholder-img::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, transparent 48%, rgba(10, 37, 64, 0.04) 49%, rgba(10, 37, 64, 0.04) 51%, transparent 52%),
    linear-gradient(-45deg, transparent 48%, rgba(10, 37, 64, 0.04) 49%, rgba(10, 37, 64, 0.04) 51%, transparent 52%);
  background-size: 24px 24px;
}

.placeholder-img__label {
  position: relative;
  z-index: 1;
}

.placeholder-img--sm { min-height: 120px; }
.placeholder-img--md { min-height: 200px; }
.placeholder-img--lg { min-height: 320px; }
.placeholder-img--xl { min-height: 480px; }

.placeholder-img--square { aspect-ratio: 1 / 1; }
.placeholder-img--wide { aspect-ratio: 16 / 9; }
.placeholder-img--portrait { aspect-ratio: 3 / 4; }

/* ============ 动效基础 ============ */
@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;
  }
}

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}