/* ==========================================================================
   DeepSeek - 下三分之一曲线 (Tidal Curve) 专属视觉设计规范
   配色设定：泥 #C4B5A4 | 涨潮蓝 #1B4F72 | 泡沫 #F7FBFC
   背景基底：深潮蓝与泥质交界暗调 (#0D2232 ~ #1B4F72)
   视觉特性：潮位大数字居上，潮汐曲线仅占下三分之一，三个潮时标注，浪花泡沫处写「探索未至之境」与入口
   ========================================================================== */

:root {
  --color-mud: #C4B5A4;
  --color-mud-dark: #8C7B68;
  --color-tide-blue: #1B4F72;
  --color-tide-deep: #0D273B;
  --color-tide-abyss: #081724;
  --color-foam: #F7FBFC;
  --color-foam-dim: rgba(247, 251, 252, 0.75);
  --color-foam-trans: rgba(247, 251, 252, 0.12);
  --color-sonar-green: rgba(0, 229, 160, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

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

html {
  font-size: 16px;
  background-color: var(--color-tide-abyss);
  color: var(--color-foam);
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--color-tide-abyss);
  color: var(--color-foam);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 顶栏：左右分栏，左边只有 Logo，右边是「API 开放平台」和「English」 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(8, 23, 36, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(196, 181, 164, 0.25);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: center;
}

.brand-logo-img {
  height: 34px;
  width: auto;
  display: block;
  object-fit: contain;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link-item {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-foam);
  padding: 8px 16px;
  border-radius: 4px;
  border: 1px solid rgba(196, 181, 164, 0.35);
  transition: all 0.2s ease;
  background: rgba(27, 79, 114, 0.25);
}

.nav-link-item:hover {
  background: var(--color-tide-blue);
  color: var(--color-foam);
  border-color: var(--color-mud);
}

.lang-selector-btn {
  font-size: 13px;
  color: var(--color-mud);
  padding: 6px 12px;
  border: 1px solid rgba(196, 181, 164, 0.4);
  border-radius: 4px;
  font-family: var(--font-mono);
  transition: all 0.2s;
}

.lang-selector-btn:hover {
  color: var(--color-foam);
  border-color: var(--color-foam);
}

/* 首屏区域：整页重心，偏右 canvas 声呐绿 rgba(0,229,160) */
.hero-stage-section {
  position: relative;
  min-height: 640px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 28px 80px;
  overflow: hidden;
}

.hero-sonar-canvas-wrap {
  position: absolute;
  top: 10px;
  right: -20px;
  width: 580px;
  height: 580px;
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

.hero-text-overlay {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.hero-announcement {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: rgba(27, 79, 114, 0.6);
  border: 1px solid var(--color-mud);
  border-radius: 30px;
  font-size: 13px;
  color: var(--color-foam);
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.announcement-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-sonar-green);
  box-shadow: 0 0 10px var(--color-sonar-green);
}

.hero-main-h1 {
  font-size: 52px;
  line-height: 1.15;
  font-weight: 800;
  color: var(--color-foam);
  letter-spacing: -0.5px;
  margin-bottom: 20px;
}

.hero-sub-p {
  font-size: 18px;
  line-height: 1.65;
  color: var(--color-mud);
  margin-bottom: 38px;
  max-width: 660px;
}

/* 两张同结构等宽卡片：图标、标题、说明、箭头，主卡链到 web.html，次卡为空链接 */
.hero-twin-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  max-width: 720px;
}

.hero-card-entry {
  background: rgba(13, 39, 59, 0.7);
  border: 1px solid rgba(196, 181, 164, 0.35);
  border-radius: 10px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
  cursor: pointer;
}

.hero-card-entry:hover {
  transform: translateY(-4px);
  border-color: var(--color-mud);
  background: rgba(27, 79, 114, 0.55);
}

.card-primary-highlight {
  border: 1.5px solid var(--color-mud);
  background: linear-gradient(135deg, rgba(27, 79, 114, 0.7) 0%, rgba(13, 39, 59, 0.9) 100%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(196, 181, 164, 0.15);
  color: var(--color-foam);
  margin-bottom: 16px;
  border: 1px solid rgba(196, 181, 164, 0.3);
}

.card-title-text {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-foam);
  margin-bottom: 8px;
}

.card-desc-text {
  font-size: 14px;
  color: var(--color-mud);
  line-height: 1.55;
  margin-bottom: 18px;
  flex-grow: 1;
}

.card-arrow-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-foam);
}

.card-arrow-action svg {
  transition: transform 0.2s;
}

.hero-card-entry:hover .card-arrow-action svg {
  transform: translateX(4px);
}

/* ==========================================================================
   【核心特色风格】下三分之一曲线 (Tidal Curve Observation)
   布局：潮汐曲线只占下方三分之一，上方是潮位数字。
   设计：海洋观测，曲线即主视觉。
   骨架：潮位，曲线，三个潮时。
   配色：泥 #C4B5A4、涨潮蓝 #1B4F72、泡沫 #F7FBFC。
   提示词：DeepSeek AI 用量被画成潮汐。上方大数字属于 DeepSeek。
   曲线标注网页版、Harness、api开放平台三个潮时。泡沫处写「探索未至之境」和入口。
   ========================================================================== */
.tide-observatory-section {
  position: relative;
  width: 100%;
  background: linear-gradient(180deg, var(--color-tide-abyss) 0%, var(--color-tide-deep) 60%, var(--color-tide-blue) 100%);
  border-top: 1px solid rgba(196, 181, 164, 0.3);
  border-bottom: 1px solid rgba(196, 181, 164, 0.3);
  padding: 80px 0 0;
  overflow: hidden;
}

.tide-observatory-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 2;
}

/* 上方占 2/3：潮位数字与 DeepSeek AI 全球用量监测 */
.tide-upper-gauge {
  min-height: 340px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.tide-gauge-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-mud);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
}

.tide-gauge-label::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  background: var(--color-mud);
  border-radius: 2px;
}

.tide-huge-number-row {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tide-huge-val {
  font-family: var(--font-mono);
  font-size: 88px;
  font-weight: 900;
  line-height: 0.95;
  color: var(--color-foam);
  text-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  letter-spacing: -2px;
}

.tide-unit-tag {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-mud);
  background: rgba(196, 181, 164, 0.15);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid rgba(196, 181, 164, 0.3);
}

.tide-status-sub {
  font-size: 15px;
  color: var(--color-mud);
  max-width: 680px;
  line-height: 1.6;
}

/* 下方 1/3：潮汐曲线与三个潮时 */
.tide-lower-curve-container {
  position: relative;
  width: 100%;
  height: 280px;
  margin-top: 40px;
}

.tide-curve-canvas {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* 曲线标注三个潮时：网页版、Harness、api开放平台 */
.tide-epochs-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  pointer-events: none;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
}

.tide-epoch-pin {
  position: absolute;
  pointer-events: auto;
  transform: translate(-50%, -100%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tide-epoch-pin[data-pos="1"] {
  left: 20%;
  top: 48%;
}

.tide-epoch-pin[data-pos="2"] {
  left: 50%;
  top: 32%;
}

.tide-epoch-pin[data-pos="3"] {
  left: 80%;
  top: 62%;
}

.epoch-badge {
  background: rgba(8, 23, 36, 0.95);
  border: 1px solid var(--color-mud);
  padding: 6px 14px;
  border-radius: 6px;
  text-align: center;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
  transition: transform 0.2s, border-color 0.2s;
}

.epoch-badge:hover {
  transform: translateY(-2px);
  border-color: var(--color-foam);
}

.epoch-badge-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-mud);
  margin-bottom: 2px;
}

.epoch-badge-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-foam);
  white-space: nowrap;
}

.epoch-stem-line {
  width: 1px;
  height: 28px;
  background: var(--color-mud);
  margin-top: 4px;
}

.epoch-stem-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-foam);
  box-shadow: 0 0 10px rgba(247, 251, 252, 0.9);
}

/* 泡沫处写「探索未至之境」和入口 */
.tide-foam-crest-bar {
  position: relative;
  z-index: 4;
  background: var(--color-foam);
  color: var(--color-tide-abyss);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  border-top: 2px solid var(--color-mud);
}

.foam-crest-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.foam-tag {
  background: var(--color-tide-blue);
  color: var(--color-foam);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.foam-motto-text {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-tide-deep);
  letter-spacing: 0.5px;
}

.foam-crest-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.foam-action-btn {
  background: var(--color-tide-deep);
  color: var(--color-foam);
  padding: 9px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.foam-action-btn:hover {
  background: var(--color-tide-blue);
  color: var(--color-foam);
  transform: translateY(-1px);
}

.foam-action-secondary {
  background: transparent;
  color: var(--color-tide-deep);
  border: 1px solid var(--color-mud-dark);
}

.foam-action-secondary:hover {
  background: var(--color-mud);
  color: var(--color-tide-abyss);
}

/* 能力区：首屏声呐变成内容，四张卡横排（深海扫描、探测未知、知识显影、Harness），下方等分指标条 */
.capabilities-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 90px 28px 70px;
}

.section-head-box {
  margin-bottom: 40px;
}

.section-eyebrow {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-mud);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: block;
}

.section-main-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-foam);
}

.capabilities-quad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.capability-card-item {
  background: rgba(13, 39, 59, 0.5);
  border: 1px solid rgba(196, 181, 164, 0.25);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s;
}

.capability-card-item:hover {
  border-color: var(--color-mud);
  background: rgba(27, 79, 114, 0.4);
  transform: translateY(-3px);
}

.cap-icon-box {
  width: 40px;
  height: 40px;
  background: rgba(196, 181, 164, 0.15);
  border: 1px solid rgba(196, 181, 164, 0.3);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-foam);
  margin-bottom: 16px;
}

.cap-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-foam);
  margin-bottom: 10px;
}

.cap-card-p {
  font-size: 14px;
  color: var(--color-mud);
  line-height: 1.6;
}

/* 下面的指标条把四组数字等分排开，用来打断卡片墙 */
.metrics-strip-break {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: rgba(27, 79, 114, 0.25);
  border: 1px solid rgba(196, 181, 164, 0.3);
  border-radius: 8px;
  padding: 30px 24px;
}

.metric-col-box {
  text-align: center;
  border-right: 1px solid rgba(196, 181, 164, 0.2);
}

.metric-col-box:last-child {
  border-right: none;
}

.metric-col-num {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 800;
  color: var(--color-foam);
  margin-bottom: 6px;
}

.metric-col-desc {
  font-size: 13px;
  color: var(--color-mud);
}

/* 步骤区：唯一写了内联布局的区块，外层灰底拉通全宽，内层收成 1200px 居中，四步竖向排列 */
.steps-outer-fullwidth {
  width: 100%;
  background: #242D35; /* 灰底拉通全宽 */
  border-top: 1px solid rgba(196, 181, 164, 0.35);
  border-bottom: 1px solid rgba(196, 181, 164, 0.35);
  padding: 80px 0;
}

.step-row-vertical {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(196, 181, 164, 0.25);
}

.step-row-vertical:last-child {
  border-bottom: none;
}

.step-col-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 800;
  color: var(--color-mud);
  min-width: 60px;
  line-height: 1;
}

.step-col-body {
  flex-grow: 1;
}

.step-col-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-foam);
  margin-bottom: 8px;
}

.step-col-p {
  font-size: 15px;
  color: #D2C7B8;
  line-height: 1.6;
}

/* API 区：退成单列代码块，注释、关键字、字符串靠颜色区分，无左右分栏 */
.api-single-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 28px;
}

.code-container-single {
  background: #091A27;
  border: 1px solid rgba(196, 181, 164, 0.3);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
}

.code-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: rgba(27, 79, 114, 0.35);
  border-bottom: 1px solid rgba(196, 181, 164, 0.2);
}

.code-dot-group {
  display: flex;
  gap: 6px;
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(196, 181, 164, 0.4);
}

.code-lang-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-mud);
}

.code-body-pre {
  margin: 0;
  padding: 24px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-foam);
}

.tok-comment { color: var(--color-mud); font-style: italic; }
.tok-keyword { color: #5DADE2; font-weight: bold; }
.tok-string  { color: #A3E4D7; }
.tok-number  { color: #F5B041; }
.tok-punct   { color: var(--color-foam); }

/* 影像区：四张横图，只做展示，没有图注和点击 */
.gallery-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 28px 90px;
}

.gallery-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.gallery-item-wrap {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid rgba(196, 181, 164, 0.25);
  background: #0A1C29;
}

.gallery-img-pure {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  pointer-events: none;
  filter: contrast(1.05) brightness(0.95);
}

/* 页脚：多列，品牌说明更宽一列，后四列为研究、产品、法务、招聘，最底下一整条版权与第三方声明 */
.site-footer {
  background: #06131D;
  border-top: 1px solid rgba(196, 181, 164, 0.3);
  padding: 70px 28px 30px;
  color: var(--color-mud);
}

.footer-multi-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 50px;
}

.footer-brand-col {
  padding-right: 20px;
}

.footer-logo {
  height: 32px;
  width: auto;
  margin-bottom: 18px;
  display: block;
}

.footer-brand-p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-mud);
  margin-bottom: 16px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-foam);
  margin-bottom: 18px;
}

.footer-link-list {
  list-style: none;
}

.footer-link-list li {
  margin-bottom: 10px;
}

.footer-link-list a {
  font-size: 13px;
  color: var(--color-mud);
  transition: color 0.2s;
}

.footer-link-list a:hover {
  color: var(--color-foam);
}

.footer-bottom-bar {
  max-width: 1280px;
  margin: 0 auto;
  border-top: 1px solid rgba(196, 181, 164, 0.15);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .capabilities-quad-grid,
  .metrics-strip-break,
  .gallery-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-multi-grid {
    grid-template-columns: 1fr 1fr;
  }
  .tide-huge-val {
    font-size: 64px;
  }
}

@media (max-width: 768px) {
  .hero-sonar-canvas-wrap {
    opacity: 0.35;
    right: -100px;
  }
  .hero-twin-cards {
    grid-template-columns: 1fr;
  }
  .hero-main-h1 {
    font-size: 36px;
  }
  .capabilities-quad-grid,
  .metrics-strip-break,
  .gallery-grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-multi-grid {
    grid-template-columns: 1fr;
  }
  .tide-huge-val {
    font-size: 48px;
  }
  .tide-foam-crest-bar {
    flex-direction: column;
    align-items: flex-start;
  }
}