/* frontend/style.css */
/* XunDao design system implementation */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&family=Noto+Serif+SC:wght@200;300;400;500&family=Playfair+Display:ital,wght@0,400;0,500;1,400&display=swap');

:root {
  /* Backgrounds */
  --xd-bg-xuan: #FAFAF8;
  --xd-bg-silk: #F5F5F2;
  --xd-bg-panel: #FFFFFF;

  /* Ink system */
  --xd-ink-jiao: #1A1A1A;
  --xd-ink-nong: #3A3A38;
  --xd-ink-zhong: #5A5A5A;
  --xd-ink-dan: #8A8A88;
  --xd-ink-qing: #B8B8B6;
  --xd-ink-xi: #E6E4DF;
  --xd-ink-highlight: #6B7878;
  --xd-ink-shadow: #4A4E4E;

  /* Accent system */
  --xd-accent-bamboo: #7F8C69;
  --xd-accent-mist: #7A8A8A;
  --xd-accent-cinnabar: #B85C4A;

  /* Typography */
  --font-heading: "Noto Serif SC", "Source Han Serif SC", "思源宋体", serif;
  --font-body: "Inter", "PingFang SC", "思源黑体", system-ui, sans-serif;
  --font-code: "JetBrains Mono", "SF Mono", "SFMono-Regular", monospace;

  --xd-max-width: 1200px;
  --xd-content-width: 1024px;
  --xd-radius-lg: 12px;
  --xd-radius-md: 8px;
  --xd-duration-quick: 200ms;
  --xd-duration-normal: 400ms;
  --xd-duration-slow: 600ms;
  --xd-shadow-ink: 0 8px 24px rgba(0, 0, 0, 0.04);
  --xd-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--xd-ink-zhong);
  background-color: var(--xd-bg-xuan);
  line-height: 1.8;
  letter-spacing: 0.01em;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  pointer-events: none;
  inset: 0;
  z-index: -2;
}

/* Subtle paper texture */
body::before {
  background-image:
    radial-gradient(circle at 20% 20%, rgba(0, 0, 0, 0.03), transparent 60%),
    radial-gradient(circle at 80% 10%, rgba(0, 0, 0, 0.035), transparent 55%),
    radial-gradient(circle at 50% 80%, rgba(0, 0, 0, 0.025), transparent 50%);
  opacity: 0.6;
}

/* Grid hint */
body::after {
  background-image: repeating-linear-gradient(
      0deg,
      rgba(182, 182, 176, 0.12),
      rgba(182, 182, 176, 0.12) 1px,
      transparent 1px,
      transparent 24px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(182, 182, 176, 0.08),
      rgba(182, 182, 176, 0.08) 1px,
      transparent 1px,
      transparent 24px
    );
  mask-image: linear-gradient(180deg, rgba(255, 255, 255, 0.65) 0%, rgba(255, 255, 255, 0) 65%);
  z-index: -3;
}

body.xundao-home::before,
body.xundao-home::after {
  content: none;
}

main {
  display: block;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

a:hover,
a:focus-visible {
  color: var(--xd-accent-bamboo);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 1000;
  color: var(--xd-bg-panel);
  background: var(--xd-accent-bamboo);
  padding: 8px 16px;
  border-radius: 4px;
}

.skip-link:focus {
  left: 24px;
  top: 24px;
  width: auto;
  height: auto;
}

.xd-shell {
  max-width: var(--xd-content-width);
  margin: 0 auto;
  padding: 64px 32px 96px;
}

@media (max-width: 1024px) {
  .xd-shell {
    padding: 48px 24px 80px;
  }
}

@media (max-width: 768px) {
  .xd-shell {
    padding: 32px 16px 64px;
  }
}

.xd-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--xd-ink-xi);
}

.xd-header__brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.xd-brand-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--xd-ink-jiao);
}

.xd-brand-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--xd-ink-nong);
}

.xd-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn,
button,
input[type="button"],
input[type="submit"] {
  font-family: var(--font-body);
  letter-spacing: 0.06em;
  transition: all var(--xd-duration-quick) cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 4px;
  cursor: pointer;
}

.btn-primary,
button.btn-primary {
  padding: 12px 32px;
  color: var(--xd-accent-bamboo);
  background: transparent;
  border: 1px solid var(--xd-accent-bamboo);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--xd-accent-bamboo);
  color: var(--xd-bg-panel);
  box-shadow: 0 4px 16px rgba(127, 140, 105, 0.2);
  transform: translateY(-2px);
}

.btn-secondary,
button.btn-secondary {
  padding: 10px 24px;
  color: var(--xd-ink-zhong);
  background: var(--xd-bg-panel);
  border: 1px solid var(--xd-ink-xi);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--xd-accent-mist);
  color: var(--xd-ink-nong);
  box-shadow: var(--xd-shadow-ink);
}

.btn-ghost {
  padding: 10px 20px;
  color: var(--xd-ink-zhong);
  border: none;
  background: transparent;
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--xd-accent-bamboo);
}

.btn-critical {
  padding: 12px 28px;
  background: var(--xd-accent-cinnabar);
  color: #fff;
  border: none;
}

.btn-critical:hover,
.btn-critical:focus-visible {
  filter: brightness(1.05);
}

/* =====================================================================
   Homepage hero layout and animation system
   ===================================================================== */

body.xundao-home {
  background: var(--xd-bg-xuan);
  color: var(--xd-ink-zhong);
  min-height: 100vh;
  position: relative;
}

.hero-wrapper {
  position: relative;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
}

.layer-bg,
.layer-landscape,
.layer-ink,
.layer-figures,
.layer-content {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.layer-bg,
.layer-landscape,
.layer-ink,
.layer-figures {
  pointer-events: none;
}

.layer-bg {
  z-index: 1;
}

.texture-paper,
.gradient-mist {
  position: absolute;
  inset: 0;
}

.texture-paper {
  background:
    radial-gradient(ellipse at 30% 20%,
      rgba(122, 138, 138, 0.08) 0%,
      transparent 40%),
    radial-gradient(ellipse at 70% 60%,
      rgba(127, 140, 105, 0.06) 0%,
      transparent 50%),
    radial-gradient(circle at 50% 50%,
      rgba(245, 245, 242, 0.4) 0%,
      transparent 70%);
  opacity: 1;
  mix-blend-mode: normal;
}

.gradient-mist {
  background: linear-gradient(180deg, rgba(250, 250, 248, 0.95) 0%, rgba(250, 250, 248, 0) 60%),
    radial-gradient(circle at 70% 15%, rgba(122, 138, 138, 0.12), transparent 60%),
    radial-gradient(circle at 15% 85%, rgba(127, 140, 105, 0.08), transparent 65%);
}

.layer-landscape {
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: flex-end;
}

.mountains {
  position: absolute;
  width: 110%;
  max-width: 1600px;
  height: 400px;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.mountain-layer {
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-size: cover;
}

.mountain-far {
  background:
    linear-gradient(135deg,
      transparent 30%,
      rgba(90, 90, 90, 0.15) 40%,
      rgba(90, 90, 90, 0.08) 55%,
      transparent 70%),
    linear-gradient(110deg,
      transparent 25%,
      rgba(122, 138, 138, 0.12) 35%,
      rgba(122, 138, 138, 0.06) 50%,
      transparent 65%);
  opacity: 0.7;
  transform: scaleY(0.8) translateY(-20%);
}

.mountain-near {
  background:
    linear-gradient(140deg,
      transparent 20%,
      rgba(26, 26, 26, 0.35) 35%,
      rgba(26, 26, 26, 0.25) 45%,
      rgba(26, 26, 26, 0.15) 55%,
      transparent 70%),
    linear-gradient(100deg,
      transparent 15%,
      rgba(58, 58, 56, 0.3) 30%,
      rgba(58, 58, 56, 0.2) 40%,
      transparent 60%);
  opacity: 0.6;
  transform: translateY(-10%) scaleY(1.1);
}

.flying-birds {
  position: absolute;
  inset: 0;
}

.bird {
  position: absolute;
  top: 15%;
  left: -40px;
  font-size: 24px;
  color: rgba(26, 26, 26, 0.7);
  opacity: 0.8;
  animation: bird-glide 36s ease-in-out infinite;
}

.bird::before {
  content: "〈";
  display: block;
  transform: rotate(90deg) scaleX(2);
  font-weight: 300;
}

.bird:nth-child(2) {
  top: 22%;
  font-size: 18px;
  opacity: 0.6;
  animation-duration: 45s;
  animation-delay: -15s;
}

@keyframes bird-glide {
  0% {
    transform: translateX(-5vw) translateY(0);
  }
  100% {
    transform: translateX(110vw) translateY(-10px);
  }
}

.layer-ink {
  z-index: 3;
  opacity: 1;
  transition: opacity 1.2s ease;
  contain: layout style paint;
  will-change: opacity;
}

.ink-flow {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.ink-line {
  position: absolute;
  height: 3px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(26, 26, 26, 0.4) 15%,
    rgba(26, 26, 26, 0.6) 30%,
    rgba(26, 26, 26, 0.3) 50%,
    rgba(58, 58, 56, 0.2) 70%,
    transparent 100%);
  filter: blur(1px);
  opacity: 0.5;
  mix-blend-mode: multiply;
  will-change: transform;
}

.ink-line:nth-child(1) {
  top: 28%;
  width: 80%;
  left: 10%;
  animation: flow-horizontal-1 20s ease-in-out infinite;
}

.ink-line:nth-child(2) {
  top: 45%;
  width: 60%;
  left: 25%;
  height: 4px;
  opacity: 0.4;
  animation: flow-horizontal-2 25s ease-in-out infinite;
  animation-delay: -5s;
}

.ink-line:nth-child(3) {
  top: 65%;
  width: 70%;
  left: 5%;
  height: 2px;
  opacity: 0.35;
  animation: flow-horizontal-3 28s ease-in-out infinite;
  animation-delay: -10s;
}

@keyframes flow-horizontal-1 {
  0% {
    transform: translateX(-20%) translateY(0);
  }
  50% {
    transform: translateX(10%) translateY(-8px);
  }
  100% {
    transform: translateX(-20%) translateY(0);
  }
}

@keyframes flow-horizontal-2 {
  0% {
    transform: translateX(-30%) translateY(0);
  }
  33% {
    transform: translateX(-5%) translateY(6px) scaleY(1.1);
  }
  66% {
    transform: translateX(12%) translateY(-6px) scaleY(0.9);
  }
  100% {
    transform: translateX(-30%) translateY(0);
  }
}

@keyframes flow-horizontal-3 {
  0% {
    transform: translateX(-40%) translateY(0);
  }
  50% {
    transform: translateX(18%) translateY(-10px);
  }
  100% {
    transform: translateX(-40%) translateY(0);
  }
}

.ink-dots {
  position: absolute;
  inset: 0;
}

.ink-dot {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle,
    rgba(26, 26, 26, 0.8) 0%,
    rgba(26, 26, 26, 0.5) 40%,
    rgba(58, 58, 56, 0.2) 70%,
    transparent 100%);
  opacity: 0.5;
  filter: blur(0.5px);
  animation: dot-breathe 12s ease-in-out infinite;
}

.ink-dot:nth-child(1) {
  width: 12px;
  height: 12px;
  top: 20%;
  left: 15%;
  opacity: 0.6;
}

.ink-dot:nth-child(2) {
  width: 8px;
  height: 8px;
  top: 35%;
  left: 38%;
  opacity: 0.45;
  animation-delay: -3s;
}

.ink-dot:nth-child(3) {
  width: 15px;
  height: 15px;
  top: 30%;
  left: 65%;
  opacity: 0.5;
  animation-delay: -6s;
  background: radial-gradient(circle,
    rgba(26, 26, 26, 0.7) 0%,
    rgba(26, 26, 26, 0.4) 50%,
    transparent 100%);
}

.ink-dot:nth-child(4) {
  width: 10px;
  height: 10px;
  top: 55%;
  left: 75%;
  opacity: 0.4;
  animation-delay: -2s;
}

.ink-dot:nth-child(5) {
  width: 14px;
  height: 14px;
  top: 68%;
  left: 40%;
  opacity: 0.55;
  animation-delay: -4s;
}

@keyframes dot-breathe {
  0%,
  100% {
    transform: scale(0.9);
    filter: blur(0.5px);
  }
  50% {
    transform: scale(1.2);
    filter: blur(1px);
  }
}

.layer-figures {
  z-index: 4;
  opacity: 1;
  transition: opacity 1.4s ease;
  contain: layout style paint;
  will-change: opacity;
}

.js-enhanced .layer-ink,
.js-enhanced .layer-figures {
  opacity: 0;
}

.js-enhanced .layer-ink.is-loaded,
.js-enhanced .layer-figures.is-loaded {
  opacity: 1;
}

.no-js .layer-ink,
.no-js .layer-figures {
  opacity: 1;
  transition: none;
}

.silhouette {
  position: absolute;
  display: block;
  background-repeat: no-repeat;
  background-size: contain;
  filter: blur(0.4px);
  will-change: transform, opacity;
}

.silhouette-seeker {
  top: 12%;
  right: 20%;
  width: 60px;
  height: 60px;
  opacity: 0.3;
  background: radial-gradient(circle at center,
    rgba(26, 26, 26, 0.6) 20%,
    rgba(58, 58, 56, 0.3) 50%,
    transparent 70%);
  border-radius: 50% 50% 45% 45%;
  animation: seeker-float 15s ease-in-out infinite;
  filter: blur(1px);
}

.silhouette-walker {
  bottom: 15%;
  right: 10%;
  width: 100px;
  height: 140px;
  opacity: 0.35;
  background:
    linear-gradient(180deg,
      rgba(26, 26, 26, 0.5) 0%,
      rgba(26, 26, 26, 0.4) 30%,
      rgba(58, 58, 56, 0.2) 60%,
      transparent 100%);
  clip-path: polygon(45% 0%, 55% 0%, 60% 30%, 65% 60%, 70% 100%, 50% 100%, 30% 100%, 35% 60%, 40% 30%);
  animation: walker-sway 35s ease-in-out infinite;
  filter: blur(0.8px);
}

.ink-bamboo {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
}

.bamboo-stem {
  position: absolute;
  right: 8%;
  bottom: 10%;
  width: 3px;
  height: 200px;
  background: linear-gradient(180deg,
    rgba(26, 26, 26, 0.2) 0%,
    rgba(26, 26, 26, 0.5) 50%,
    rgba(26, 26, 26, 0.3) 100%);
  transform-origin: bottom;
  animation: bamboo-sway 20s ease-in-out infinite;
}

.bamboo-leaf {
  position: absolute;
  width: 30px;
  height: 8px;
  background: rgba(26, 26, 26, 0.4);
  border-radius: 0 100% 0 100%;
  transform-origin: left center;
}

.bamboo-leaf:nth-child(1) {
  top: 30%;
  left: 100%;
  transform: rotate(-30deg);
}

.bamboo-leaf:nth-child(2) {
  top: 50%;
  left: 100%;
  transform: rotate(-45deg);
  opacity: 0.6;
}

.bamboo-leaf:nth-child(3) {
  top: 70%;
  right: 100%;
  transform: rotate(135deg);
  opacity: 0.5;
}

@keyframes seeker-float {
  0%, 100% {
    transform: translateY(0) scale(1);
    opacity: 0.25;
  }
  50% {
    transform: translateY(-10px) scale(1.05);
    opacity: 0.35;
  }
}

@keyframes walker-sway {
  0%, 100% {
    transform: translateX(0) scaleY(1);
  }
  25% {
    transform: translateX(-10px) scaleY(0.98);
  }
  75% {
    transform: translateX(10px) scaleY(1.02);
  }
}

@keyframes bamboo-sway {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-2deg);
  }
  75% {
    transform: rotate(2deg);
  }
}

.layer-content {
  z-index: 5;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 48px clamp(24px, 8vw, 120px) 72px;
}

.nav-minimal {
  display: flex;
  justify-content: flex-end;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
}

.nav-minimal ul {
  list-style: none;
  display: flex;
  gap: clamp(16px, 3vw, 36px);
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-minimal a,
.nav-minimal button {
  text-decoration: none;
  background: transparent;
  border: none;
  font: inherit;
  color: var(--xd-ink-zhong);
  padding: 4px 0;
}

.nav-minimal button {
  cursor: pointer;
}

.hero-content {
  margin-top: auto;
  max-width: 520px;
}

.brand-mark {
  font-family: var(--font-heading);
  letter-spacing: 0.18em;
}

.brand-cn {
  font-size: clamp(3rem, 5vw, 4rem);
  font-weight: 200;
  color: var(--xd-ink-jiao);
  margin: 0;
}

.brand-en {
  font-family: "Playfair Display", var(--font-body);
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--xd-ink-dan);
  margin-top: 8px;
}

.tagline {
  margin: 32px 0 24px;
}

.tagline p {
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  letter-spacing: 0.16em;
  color: var(--xd-ink-nong);
  margin: 8px 0;
}

.sub-text {
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--xd-ink-zhong);
}

.sub-text p {
  margin: 6px 0;
}

.cta-group {
  display: flex;
  gap: 18px;
  margin-top: 32px;
}

.cta-group .btn-primary,
.cta-group .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.cta-group .btn-primary::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(127, 140, 105, 0.16);
  transform: translate(-50%, -50%);
  transition: width 0.7s ease, height 0.7s ease;
  pointer-events: none;
}

.cta-group .btn-primary:hover::before,
.cta-group .btn-primary:focus-visible::before {
  width: 220%;
  height: 220%;
}

.cta-group .en {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  opacity: 0.7;
  font-style: italic;
}

.hero-footer {
  margin-top: auto;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: rgba(26, 26, 26, 0.4);
  text-align: right;
}

.hero-content > * {
  opacity: 0;
  transform: translateY(24px);
  animation: hero-fade-up 0.9s ease forwards;
}

.brand-mark {
  animation-delay: 0.2s;
}

.tagline {
  animation-delay: 0.35s;
}

.sub-text {
  animation-delay: 0.5s;
}

.cta-group {
  animation-delay: 0.65s;
}

.hero-footer {
  animation: hero-fade-up 1s ease forwards;
  animation-delay: 0.8s;
}

@keyframes hero-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 1024px) {
  .hero-wrapper {
    min-height: 100vh;
  }

  .layer-content {
    padding: 32px clamp(20px, 6vw, 72px) 48px;
  }

  .nav-minimal {
    justify-content: center;
  }

  .hero-content {
    margin: 0 auto;
    text-align: center;
  }

  .hero-footer {
    text-align: center;
  }
}

@media (max-width: 768px) {
  .mountain-layer {
    opacity: 0.8;
  }
  .ink-line {
    opacity: 0.4;
  }
  .ink-dot {
    opacity: 0.35;
  }
  .mountain-near {
    opacity: 0.12;
  }
  .ink-line:nth-child(3) {
    display: none;
  }
  .ink-dot:nth-child(n + 4) {
    display: none;
  }
  .silhouette-seeker {
    display: none;
  }
  .silhouette-walker {
    right: 8%;
    bottom: 12%;
    animation-duration: 36s;
    opacity: 0.25;
  }
  .cta-group {
    flex-direction: column;
  }
  .cta-group .btn-primary,
  .cta-group .btn-secondary {
    justify-content: center;
    width: 100%;
  }
}

@media (max-width: 560px) {
  .nav-minimal ul {
    gap: 16px;
    flex-wrap: wrap;
  }

  .nav-minimal li:last-child {
    width: 100%;
    text-align: center;
  }
}

@media (min-width: 1600px) {
  .hero-content {
    max-width: 600px;
  }

  .brand-cn {
    font-size: clamp(3.5rem, 4vw, 4.5rem);
  }

  .tagline p {
    font-size: clamp(1.4rem, 2.2vw, 1.8rem);
  }
}

/* ===========================
   Motion accessibility & performance
   =========================== */

@media (max-device-memory: 2GB) {
  .ink-line,
  .ink-dot,
  .silhouette,
  .bird,
  .hero-content > *,
  .hero-footer {
    animation: none !important;
  }

  .layer-ink,
  .layer-figures {
    opacity: 1 !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ink-line,
  .ink-dot,
  .silhouette,
  .bird,
  .hero-content > *,
  .hero-footer {
    animation: none !important;
    transition-duration: 0.001ms !important;
  }

  .layer-ink,
  .layer-figures {
    opacity: 1 !important;
  }

  .hero-content > *,
  .hero-footer {
    opacity: 1 !important;
    transform: none !important;
  }
}

@media (max-width: 768px),
  (max-height: 640px) {
  body.xundao-home {
    background: linear-gradient(180deg, #fafaf8 0%, #f5f5f2 60%, #f2f2ef 100%);
  }
}

input,
select,
textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 6px;
  border: 1px solid var(--xd-ink-xi);
  background: var(--xd-bg-panel);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--xd-ink-nong);
  transition: border-color var(--xd-duration-quick) cubic-bezier(0.4, 0, 0.2, 1),
    background-color var(--xd-duration-quick) cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow var(--xd-duration-quick) cubic-bezier(0.4, 0, 0.2, 1);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--xd-accent-mist);
  background: var(--xd-bg-silk);
  box-shadow: 0 0 0 3px rgba(127, 140, 105, 0.1);
}

label {
  display: block;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--xd-ink-dan);
  margin-bottom: 8px;
  text-transform: uppercase;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.xd-card {
  background: var(--xd-bg-panel);
  border: 1px solid var(--xd-ink-xi);
  border-radius: var(--xd-radius-lg);
  padding: 32px;
  box-shadow: var(--xd-shadow-ink);
  position: relative;
  overflow: hidden;
}

.xd-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(127, 140, 105, 0.12), transparent 55%);
  opacity: 0.6;
  pointer-events: none;
}

.xd-card__title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  letter-spacing: 0.1em;
  color: var(--xd-ink-jiao);
  margin-bottom: 12px;
}

.xd-card__subtitle {
  font-size: 1rem;
  color: var(--xd-ink-zhong);
  margin-bottom: 24px;
}

.xd-card__footer {
  margin-top: 24px;
  font-size: 0.875rem;
  color: var(--xd-ink-dan);
}

.login-header {
  max-width: var(--xd-content-width);
  margin: 0 auto;
  padding: 24px 32px 0;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
}

.login-header__link {
  text-decoration: none;
  color: var(--xd-ink-dan);
}

.login-header__link:hover,
.login-header__link:focus-visible {
  color: var(--xd-accent-bamboo);
}

@media (max-width: 768px) {
  .login-header {
    padding: 16px 20px 0;
    text-align: center;
  }
}

/* Authentication layout */
.auth-shell {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
  align-items: center;
}

.auth-intro {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.auth-intro h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--xd-ink-jiao);
}

.auth-intro .xd-slogan {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  letter-spacing: 0.2em;
  color: var(--xd-ink-nong);
}

.auth-intro p {
  max-width: 36ch;
  color: var(--xd-ink-zhong);
}

.auth-card form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.auth-support {
  font-size: 0.875rem;
  color: var(--xd-ink-dan);
  margin-top: 12px;
}

/* Dashboard */
.dashboard {
  max-width: var(--xd-max-width);
  margin: 0 auto;
  padding: 32px 32px 96px;
}

@media (max-width: 1024px) {
  .dashboard {
    padding: 24px;
  }
}

@media (max-width: 768px) {
  .dashboard {
    padding: 16px;
  }
}

.dashboard header {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--xd-ink-xi);
}

.dashboard header h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  letter-spacing: 0.12em;
  color: var(--xd-ink-jiao);
}

.dashboard header p {
  margin: 0;
  color: var(--xd-ink-dan);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.features-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.feature-card {
  position: relative;
  padding: 28px;
  border-radius: var(--xd-radius-lg);
  border: 1px solid var(--xd-ink-xi);
  background: var(--xd-bg-panel);
  box-shadow: var(--xd-shadow-ink);
  transition: transform var(--xd-duration-normal) cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow var(--xd-duration-normal) cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 240px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(127, 140, 105, 0.12);
  border-radius: calc(var(--xd-radius-lg) - 12px);
  pointer-events: none;
}

.feature-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--xd-ink-jiao);
}

.feature-card p {
  margin: 0;
  color: var(--xd-ink-zhong);
  flex: 1;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--xd-shadow-hover);
}

.feature-link {
  align-self: flex-start;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid var(--xd-accent-bamboo);
  color: var(--xd-accent-bamboo);
  transition: all var(--xd-duration-quick) cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-link:hover,
.feature-link:focus-visible {
  background: var(--xd-accent-bamboo);
  color: var(--xd-bg-panel);
  box-shadow: 0 4px 16px rgba(127, 140, 105, 0.25);
}

.api-key-selector {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--xd-ink-xi);
  backdrop-filter: blur(8px);
}

.api-key-selector label {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: none;
  font-size: 0.85rem;
  color: var(--xd-ink-dan);
}

.api-key-selector select {
  width: auto;
  min-width: 220px;
  border: 1px solid var(--xd-ink-xi);
  background: var(--xd-bg-panel);
  font-size: 0.95rem;
}

/* Diagnostics */
.diagnostics-container {
  max-width: var(--xd-max-width);
  margin: 0 auto;
  padding: 48px 32px 96px;
}

.diagnostics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.diagnostics-section {
  background: var(--xd-bg-panel);
  border-radius: var(--xd-radius-lg);
  border: 1px solid var(--xd-ink-xi);
  padding: 32px;
  box-shadow: var(--xd-shadow-ink);
}

.diagnostics-section h2 {
  margin-top: 0;
  font-family: var(--font-heading);
  font-weight: 300;
  letter-spacing: 0.1em;
  font-size: 1.35rem;
  color: var(--xd-ink-jiao);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--xd-ink-xi);
}

.test-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(230, 228, 223, 0.8);
}

.test-item:last-child {
  border-bottom: none;
}

.test-name {
  font-size: 1rem;
  color: var(--xd-ink-nong);
  letter-spacing: 0.05em;
}

.test-status {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--xd-ink-dan);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 4px 16px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-success {
  background: rgba(127, 140, 105, 0.12);
  color: var(--xd-accent-bamboo);
}

.status-error {
  background: rgba(184, 92, 74, 0.12);
  color: var(--xd-accent-cinnabar);
}

.status-pending {
  background: rgba(138, 138, 136, 0.12);
  color: var(--xd-ink-dan);
}

.status-running {
  background: rgba(122, 138, 138, 0.12);
  color: var(--xd-accent-mist);
}

pre {
  font-family: var(--font-code);
  background: var(--xd-bg-silk);
  padding: 16px;
  border-radius: var(--xd-radius-md);
  border: 1px solid var(--xd-ink-xi);
  max-height: 320px;
  overflow: auto;
  white-space: pre-wrap;
  line-height: 1.6;
}

code {
  font-family: var(--font-code);
  background: rgba(245, 245, 242, 0.7);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--xd-ink-nong);
}

/* Usage dashboard */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.stat-card {
  padding: 24px;
  border-radius: var(--xd-radius-lg);
  border: 1px solid var(--xd-ink-xi);
  background: var(--xd-bg-panel);
  box-shadow: var(--xd-shadow-ink);
}

.stat-card h3 {
  margin: 0 0 12px;
  color: var(--xd-ink-dan);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--xd-ink-jiao);
}

.stat-unit {
  font-size: 1rem;
  color: var(--xd-ink-dan);
  margin-left: 4px;
}

.table-container {
  margin-bottom: 56px;
}

.table-container h2 {
  font-family: var(--font-heading);
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--xd-ink-nong);
  margin-bottom: 16px;
}

.usage-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--xd-ink-xi);
  border-radius: var(--xd-radius-lg);
  overflow: hidden;
  background: var(--xd-bg-panel);
  box-shadow: var(--xd-shadow-ink);
}

.usage-table th,
.usage-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid rgba(230, 228, 223, 0.8);
}

.usage-table th {
  background: var(--xd-bg-silk);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--xd-ink-dan);
  text-transform: uppercase;
}

.usage-table tbody tr:hover {
  background: rgba(245, 245, 242, 0.7);
}

.cost-highlight {
  color: var(--xd-accent-bamboo);
  font-weight: 500;
}

/* Forms inside cards */
.xd-form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-box {
  margin-top: 24px;
  padding: 24px;
  background: var(--xd-bg-silk);
  border-radius: var(--xd-radius-lg);
  border: 1px solid var(--xd-ink-xi);
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-word;
}

footer {
  margin-top: 64px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--xd-ink-dan);
  line-height: 1.8;
}

footer .xd-seal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-heading);
  letter-spacing: 0.2em;
}

.xd-caption {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--xd-ink-dan);
  text-transform: uppercase;
}

footer a {
  color: var(--xd-accent-bamboo);
  text-decoration: none;
}

footer a:hover,
footer a:focus-visible {
  text-decoration: underline;
}

/* Animations */
@keyframes inkSpread {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1); opacity: 1; }
  100% { transform: scale(1.05); opacity: 0.6; }
}

.ink-pulse {
  animation: inkSpread 6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

/* ============================================================================== */
/* [NEW] Bazi Core Data Overview Page Styles */
/* ============================================================================== */

.overview-section {
  margin-bottom: 3.5rem;
}

.overview-section-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--xd-ink-xi);
}

.overview-section-header h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--xd-ink-jiao);
  margin: 0 0 0.25rem 0;
}

.overview-section-header p {
  font-size: 0.9rem;
  color: var(--xd-ink-dan);
  margin: 0;
}

.overview-grid {
  display: grid;
  gap: 1.5rem;
}

.overview-grid.two-cols { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.overview-grid.three-cols { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.overview-grid.four-cols { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.overview-card {
  background: var(--xd-bg-panel);
  border: 1px solid var(--xd-ink-xi);
  border-radius: var(--xd-radius-md);
  padding: 1.5rem;
  box-shadow: var(--xd-shadow-ink);
}

.overview-card.full-span {
  grid-column: 1 / -1;
}

.day-master {
  color: var(--xd-accent-cinnabar);
  font-weight: 600;
}

.bazi-info {
  text-align: right;
  font-size: 0.85rem;
  color: var(--xd-ink-dan);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--xd-ink-xi);
}

.metric-card {
  background: var(--xd-bg-panel);
  border: 1px solid var(--xd-ink-xi);
  border-radius: var(--xd-radius-md);
  padding: 1rem 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5rem;
}

.metric-label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--xd-ink-dan);
  text-transform: uppercase;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--xd-ink-nong);
}

.classic-text-card {
  background: var(--xd-bg-silk);
  border: 1px solid var(--xd-ink-xi);
  border-radius: var(--xd-radius-md);
  display: flex;
  flex-direction: column;
}

.classic-text-card .card-header {
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.1em;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--xd-ink-xi);
  color: var(--xd-ink-jiao);
}

.classic-text-card .card-body {
  padding: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.7;
  flex-grow: 1;
}

.overview-dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 1rem 1.5rem;
  align-items: baseline;
}

.overview-dl dt {
  font-weight: 500;
  color: var(--xd-ink-nong);
}

.overview-dl dd {
  margin: 0;
  color: var(--xd-ink-zhong);
}


@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;
  }
}