/* ==========================================================================
   学晓 AI · 教学与教务系统
   主样式表 v3 — 双配色 · 明快几何
   活力橙 × 深墨蓝灰，Manrope，大圆角 + 胶囊按钮
   ========================================================================== */

/* ========== 1. Reset ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: 0;
  background: none;
}

h1,
h2,
h3,
h4,
p,
figure,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

::selection {
  background: var(--orange-500);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--orange-500);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* ========== 2. 氛围层：双色调晕染 ========== */
.atmos {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(52rem 36rem at 4% -8%, rgba(224, 106, 0, 0.13), transparent 60%),
    radial-gradient(44rem 32rem at 98% 6%, rgba(43, 46, 58, 0.08), transparent 58%);
}

/* ========== 3. 版式 ========== */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

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

.section {
  padding: var(--space-9) 0;
}

.section-sm {
  padding: var(--space-8) 0;
}

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

.section--dark {
  background: var(--navy-800);
  color: rgba(255, 255, 255, 0.72);
  position: relative;
  overflow: hidden;
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: #fff;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 15px;
  border-radius: var(--radius-pill);
  background: var(--orange-50);
  color: var(--orange-700);
  font-size: var(--fs-sm);
  font-weight: 700;
  margin-bottom: var(--space-5);
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange-500);
}

.section--dark .eyebrow {
  background: rgba(224, 106, 0, 0.16);
  color: var(--orange-300);
}

.h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.4vw, var(--fs-5xl));
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--navy-800);
}

.h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.6vw, var(--fs-3xl));
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--navy-800);
}

.h3 {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.02em;
  color: var(--navy-800);
}

.h4 {
  font-size: var(--fs-base);
  font-weight: 700;
  line-height: 1.55;
  color: var(--navy-800);
}

.section--dark .h2,
.section--dark .h3,
.section--dark .h4 {
  color: #fff;
}

.lead {
  font-size: var(--fs-md);
  line-height: 1.82;
  color: var(--color-muted);
  font-weight: 500;
}

.small {
  font-size: var(--fs-sm);
  line-height: 1.65;
  color: var(--color-subtle);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.section-head {
  max-width: 720px;
  margin-bottom: var(--space-8);
}

.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head--center .eyebrow {
  margin-left: auto;
  margin-right: auto;
}

.section-head .lead {
  margin-top: var(--space-5);
}

.section--dark .lead {
  color: rgba(255, 255, 255, 0.66);
}

/* ========== 4. 按钮：胶囊 ========== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 54px;
  padding: 0 32px;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm2);
  font-weight: 700;
  white-space: nowrap;
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}

.btn .arrow {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-out);
}

.btn:hover {
  transform: translateY(-3px);
}

.btn:hover .arrow {
  transform: translateX(5px);
}

.btn:active {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--orange-500);
  color: #fff;
  box-shadow: var(--shadow-orange);
}

.btn--primary:hover {
  background: var(--orange-600);
  box-shadow: 0 14px 34px rgba(224, 106, 0, 0.36);
}

.btn--dark {
  background: var(--navy-800);
  color: #fff;
}

.btn--dark:hover {
  background: var(--navy-900);
  box-shadow: var(--shadow-2);
}

.btn--outline {
  border-color: var(--line-strong);
  color: var(--navy-800);
  background: var(--white);
}

.btn--outline:hover {
  border-color: var(--orange-500);
  color: var(--orange-600);
}

.btn--outline-dark {
  border-color: rgba(255, 255, 255, 0.32);
  color: #fff;
}

.btn--outline-dark:hover {
  border-color: var(--orange-500);
  background: var(--orange-500);
  color: #fff;
}

.btn--sm {
  height: 44px;
  padding: 0 22px;
  font-size: var(--fs-sm);
}

.btn--block {
  width: 100%;
}

/* ========== 5. Header ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 2px 16px rgba(43, 46, 58, 0.05);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 82px;
  gap: var(--space-6);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo__mark {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--navy-800);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 800;
  transition: background-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.logo:hover .logo__mark {
  background: var(--orange-500);
  transform: rotate(-6deg);
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo__name {
  font-family: var(--font-display);
  font-size: 18.5px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--navy-800);
}

.logo__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-subtle);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  position: relative;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm2);
  font-weight: 600;
  color: var(--navy-500);
  transition: background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.nav__link:hover {
  background: var(--navy-50);
  color: var(--navy-800);
}

.nav__link.is-active {
  background: var(--navy-800);
  color: #fff;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  padding: 0;
  place-items: center;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--navy-800);
  margin: 4px auto;
  border-radius: 1px;
  transition: all var(--dur-base) var(--ease-out);
}

/* ========== 6. Hero ========== */
.hero {
  position: relative;
  padding: 108px 0 100px;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(43, 46, 58, 0.07) 1.4px, transparent 1.4px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse at 40% 32%, #000 8%, transparent 70%);
  mask-image: radial-gradient(ellipse at 40% 32%, #000 8%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: var(--space-8);
  align-items: center;
}

.hero__body {
  min-width: 0;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px 6px 6px;
  border-radius: var(--radius-pill);
  background: var(--white);
  box-shadow: var(--shadow-1);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--navy-600);
  margin-bottom: var(--space-6);
}

.hero__badge b {
  padding: 4px 13px;
  border-radius: var(--radius-pill);
  background: var(--orange-500);
  color: #fff;
  font-size: var(--fs-xs);
  font-weight: 800;
}

.hero__title {
  margin-bottom: var(--space-5);
}

.hero__title em {
  font-style: normal;
  position: relative;
  color: var(--orange-600);
  white-space: nowrap;
}

.hero__title em::after {
  content: "";
  position: absolute;
  left: -3px;
  right: -3px;
  bottom: 7px;
  height: 11px;
  background: var(--orange-200);
  border-radius: var(--radius-pill);
  z-index: -1;
}

.hero__desc {
  font-size: var(--fs-md);
  line-height: 1.85;
  color: var(--color-muted);
  font-weight: 500;
  max-width: 540px;
  margin-bottom: var(--space-7);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero__meta-item {
  flex: 1 1 130px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow-1);
  text-align: center;
  transition: transform var(--dur-base) var(--ease-out);
}

.hero__meta-item:hover {
  transform: translateY(-5px);
}

.hero__meta-item b {
  display: block;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--navy-800);
}

.hero__meta-item span {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--color-subtle);
}

.hero__visual {
  position: relative;
}

.hero__card {
  background: var(--navy-800);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3);
  overflow: hidden;
  transform: rotate(-1.4deg);
  transition: transform var(--dur-slow) var(--ease-out);
}

.hero__card:hover {
  transform: rotate(0deg) translateY(-6px);
}

.hero__card-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 15px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.hero__card-bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
}

.hero__card-bar i:nth-child(1) {
  background: #ff6b5c;
}
.hero__card-bar i:nth-child(2) {
  background: #ffc043;
}
.hero__card-bar i:nth-child(3) {
  background: #4ade80;
}

.hero__card-bar span {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.55);
}

.hero__card-body {
  padding: 24px;
  display: grid;
  gap: 14px;
}

.hstat {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
}

.hstat__label {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.72);
}

.hstat__value {
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  white-space: nowrap;
}

.hstat__value em {
  font-style: normal;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--orange-300);
  margin-left: 6px;
}

.hbars {
  display: grid;
  gap: 14px;
}

.hbar:last-child {
  margin-bottom: 0;
}

.hbar__top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.68);
  margin-bottom: 8px;
}

.hbar__track {
  height: 7px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.hbar__fill {
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--orange-500), var(--orange-300));
}

.hero__float {
  position: absolute;
  background: var(--orange-500);
  color: #fff;
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-orange);
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero__float--tl {
  top: 54px;
  left: -42px;
  animation: float 7s ease-in-out infinite;
}

.hero__float--br {
  bottom: 42px;
  right: -36px;
  background: var(--navy-800);
  animation: float 7s ease-in-out infinite 1.6s;
}

.hero__float-ico {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.22);
  display: grid;
  place-items: center;
  font-size: 16px;
}

.hero__float--br .hero__float-ico {
  background: var(--orange-500);
}

.hero__float b {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 800;
  color: #fff;
}

.hero__float > span:last-child span {
  font-size: 12px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-11px);
  }
}

/* ========== 7. 卡片 ========== */
.grid {
  display: grid;
  gap: var(--space-5);
}

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

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

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

.card {
  position: relative;
  padding: 34px 30px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.card:hover,
.card--hover:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-3);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--orange-500);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}

.card:hover::before {
  transform: scaleX(1);
}

.card__num {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--navy-50);
  color: var(--navy-500);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-5);
}

.card:hover .card__num {
  background: var(--orange-50);
  color: var(--orange-700);
}

.card__ico {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: var(--navy-800);
  color: #fff;
  display: grid;
  place-items: center;
  margin-bottom: var(--space-5);
  transition: background-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.card__ico svg {
  width: 25px;
  height: 25px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card:hover .card__ico {
  background: var(--orange-500);
  transform: scale(1.06) rotate(-5deg);
}

.card p {
  margin-top: var(--space-3);
  font-size: var(--fs-sm2);
  line-height: 1.8;
  color: var(--color-muted);
}

.card__list {
  margin-top: var(--space-5);
  display: grid;
  gap: 10px;
}

.card__list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: var(--fs-sm2);
  font-weight: 500;
  color: var(--navy-600);
}

.card__list li::before {
  content: "";
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border-radius: 50%;
  background: var(--orange-100);
  box-shadow: inset 0 0 0 4px var(--orange-500);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-5);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--navy-50);
  font-size: var(--fs-sm2);
  font-weight: 700;
  color: var(--navy-800);
  transition: background-color var(--dur-base) var(--ease-out),
    gap var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out);
}

.card__link:hover {
  background: var(--orange-500);
  color: #fff;
  gap: 12px;
}

/* ========== 8. 分栏 ========== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-9);
  align-items: center;
}

.split--reverse .split__visual {
  order: -1;
}

.split__body .lead {
  margin-top: var(--space-5);
}

.checklist {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-4);
}

.checklist li {
  display: flex;
  gap: 15px;
  align-items: flex-start;
}

.checklist .tick {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  margin-top: 2px;
  border-radius: 50%;
  background: var(--orange-500);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 800;
}

.checklist b {
  display: block;
  font-size: var(--fs-sm2);
  font-weight: 700;
  color: var(--navy-800);
}

.checklist span {
  display: block;
  font-size: var(--fs-sm2);
  line-height: 1.75;
  color: var(--color-muted);
}

.section--dark .checklist b {
  color: #fff;
}

.section--dark .checklist span {
  color: rgba(255, 255, 255, 0.66);
}

.frame {
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}

.frame__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 20px;
  background: var(--navy-800);
}

.frame__bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.24);
}

.frame__bar i:nth-child(1) {
  background: #ff6b5c;
}
.frame__bar i:nth-child(2) {
  background: #ffc043;
}
.frame__bar i:nth-child(3) {
  background: #4ade80;
}

.frame__bar span {
  margin-left: 10px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
}

.frame__body {
  padding: 22px;
  display: grid;
  gap: 10px;
}

.frow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg);
  transition: background-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.frow:hover {
  background: var(--orange-50);
  transform: translateX(4px);
}

.frow__title {
  display: flex;
  align-items: center;
  gap: 13px;
  min-width: 0;
}

.frow__ico {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-xs);
  background: var(--navy-800);
  color: #fff;
  display: grid;
  place-items: center;
}

.frow__ico svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.frow:hover .frow__ico {
  background: var(--orange-500);
}

.frow__title b {
  display: block;
  font-size: var(--fs-sm2);
  font-weight: 700;
  color: var(--navy-800);
}

.frow__title span {
  display: block;
  font-size: var(--fs-sm);
  color: var(--color-subtle);
}

.tag {
  flex-shrink: 0;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: 700;
  white-space: nowrap;
}

.tag--ok {
  background: #e6f7ed;
  color: #15803d;
}

.tag--run {
  background: var(--orange-50);
  color: var(--orange-700);
}

.tag--idle {
  background: var(--navy-50);
  color: var(--navy-500);
}

.section--dark .frame {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}

.section--dark .frame__bar {
  background: rgba(255, 255, 255, 0.06);
}

.section--dark .frow {
  background: rgba(255, 255, 255, 0.06);
}

.section--dark .frow:hover {
  background: rgba(224, 106, 0, 0.14);
}

.section--dark .frow__ico {
  background: var(--orange-500);
}

.section--dark .frow__title b {
  color: #fff;
}

.section--dark .frow__title span {
  color: rgba(255, 255, 255, 0.55);
}

.section--dark .hstat {
  background: rgba(255, 255, 255, 0.06);
}

.section--dark .hbar__track {
  background: rgba(255, 255, 255, 0.14);
}

/* ========== 9. 步骤 ========== */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  counter-reset: step;
}

.step {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-1);
  counter-increment: step;
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
}

.section--dark .step {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}

.step__num {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--orange-500);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--fs-sm2);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.step__num::before {
  content: counter(step, decimal-leading-zero);
}

.step h4 {
  margin-bottom: var(--space-2);
}

.step p {
  font-size: var(--fs-sm2);
  line-height: 1.8;
  color: var(--color-muted);
}

.section--dark .step p {
  color: rgba(255, 255, 255, 0.64);
}

/* ========== 10. 数据块 ========== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.stat {
  padding: 36px 24px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-1);
  text-align: center;
  transition: transform var(--dur-base) var(--ease-out);
}

.stat:hover {
  transform: translateY(-6px);
}

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.035em;
  color: var(--navy-800);
}

.stat b sup,
.stat b small {
  font-size: 18px;
  color: var(--orange-500);
  margin-left: 3px;
  top: -0.7em;
  letter-spacing: 0;
}

.stat span {
  display: block;
  margin-top: var(--space-3);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-muted);
}

.section--dark .stat {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}

.section--dark .stat b {
  color: #fff;
}

.section--dark .stat span {
  color: rgba(255, 255, 255, 0.6);
}

/* ========== 11. 引言 ========== */
.quote {
  max-width: 840px;
  margin: 0 auto;
  text-align: center;
}

.quote__mark {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--orange-500);
  color: #fff;
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--space-6);
}

.quote blockquote {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 800;
  line-height: 1.62;
  letter-spacing: -0.02em;
  color: var(--navy-800);
  margin: 0;
}

.quote cite {
  display: inline-block;
  margin-top: var(--space-5);
  padding: 7px 20px;
  border-radius: var(--radius-pill);
  background: var(--navy-50);
  font-style: normal;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--navy-600);
}

/* ========== 12. 标签页 ========== */
.tabs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-7);
}

.tab {
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: var(--white);
  font-size: var(--fs-sm2);
  font-weight: 700;
  color: var(--navy-500);
  box-shadow: var(--shadow-1);
  transition: all var(--dur-base) var(--ease-out);
}

.tab:hover {
  color: var(--navy-800);
  transform: translateY(-2px);
}

.tab.is-active {
  background: var(--navy-800);
  color: #fff;
  box-shadow: var(--shadow-2);
}

.tabpanel {
  display: none;
}

.tabpanel.is-active {
  display: block;
  animation: rise var(--dur-slow) var(--ease-out);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== 13. 表格 ========== */
.table-wrap {
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-1);
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.table th,
.table td {
  padding: 18px 26px;
  text-align: left;
  font-size: var(--fs-sm2);
  border-bottom: 1px solid var(--line);
}

.table th {
  background: var(--navy-50);
  font-size: var(--fs-sm);
  font-weight: 800;
  color: var(--navy-700);
  white-space: nowrap;
}

.table td {
  color: var(--color-muted);
}

.table tbody tr:last-child td {
  border-bottom: 0;
}

.table tbody tr {
  transition: background-color var(--dur-fast) var(--ease-out);
}

.table tbody tr:hover {
  background: var(--orange-50);
}

.table td b {
  color: var(--navy-800);
  font-weight: 700;
}

.table--info tbody tr:hover {
  background: transparent;
}

.table--info td:first-child {
  width: 190px;
  font-size: var(--fs-sm);
  font-weight: 800;
  color: var(--navy-700);
}

/* ========== 14. FAQ ========== */
.faq {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-3);
}

.faq__item {
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition: box-shadow var(--dur-base) var(--ease-out);
}

.faq__item.is-open {
  box-shadow: var(--shadow-2);
}

.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding: 22px 26px;
  text-align: left;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--navy-800);
  transition: color var(--dur-fast) var(--ease-out);
}

.faq__q:hover {
  color: var(--orange-600);
}

.faq__icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--navy-50);
  color: var(--navy-600);
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 500;
  line-height: 1;
  transition: all var(--dur-base) var(--ease-out);
}

.faq__item.is-open .faq__icon {
  transform: rotate(45deg);
  background: var(--orange-500);
  color: #fff;
}

.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.44s var(--ease-out);
}

.faq__a p {
  padding: 0 26px 26px;
  font-size: var(--fs-sm2);
  line-height: 1.9;
  color: var(--color-muted);
  max-width: 740px;
}

/* ========== 15. CTA ========== */
.cta {
  position: relative;
  padding: 88px 64px;
  border-radius: var(--radius-xl);
  background: var(--navy-800);
  text-align: center;
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  top: -260px;
  left: 50%;
  transform: translateX(-50%);
  width: 680px;
  height: 680px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(224, 106, 0, 0.28), transparent 66%);
}

.cta::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.07) 1.4px, transparent 1.4px);
  background-size: 24px 24px;
}

.cta > * {
  position: relative;
  z-index: 2;
}

.cta h2 {
  color: #fff;
  margin-bottom: var(--space-5);
}

.cta p {
  color: rgba(255, 255, 255, 0.68);
  max-width: 560px;
  margin: 0 auto var(--space-7);
  font-size: var(--fs-md);
  font-weight: 500;
  line-height: 1.8;
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

/* ========== 16. 联系 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: var(--space-8);
  align-items: start;
}

.info-list {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-3);
}

.info-item {
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow-1);
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  transition: transform var(--dur-base) var(--ease-out);
}

.info-item:hover {
  transform: translateX(5px);
}

.info-item__ico {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-xs);
  background: var(--orange-50);
  color: var(--orange-600);
  display: grid;
  place-items: center;
}

.info-item__ico svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.info-item b {
  display: block;
  margin-bottom: 4px;
  font-size: var(--fs-xs);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-subtle);
}

.info-item p {
  font-size: var(--fs-sm2);
  font-weight: 600;
  color: var(--navy-800);
  line-height: 1.65;
}

.info-item p a:hover {
  color: var(--orange-600);
}

.form {
  padding: 38px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-2);
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.field {
  margin-bottom: var(--space-4);
}

.field label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--navy-700);
}

.field label i {
  font-style: normal;
  color: var(--orange-500);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-family: inherit;
  font-size: var(--fs-sm2);
  color: var(--navy-800);
  transition: border-color var(--dur-fast) var(--ease-out),
    background-color var(--dur-fast) var(--ease-out);
}

.field input::placeholder,
.field textarea::placeholder {
  color: var(--navy-300);
}

.field input:hover,
.field select:hover,
.field textarea:hover {
  border-color: var(--navy-200);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 0;
  border-color: var(--orange-500);
  background: var(--white);
}

.field textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.8;
}

.field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1.5L7 7.5L13 1.5' stroke='%235a6172' stroke-width='1.8' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 44px;
}

.form__note {
  margin-top: var(--space-4);
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--color-subtle);
}

.form__msg {
  display: none;
  margin-top: var(--space-4);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: #e6f7ed;
  color: #15803d;
  font-size: var(--fs-sm2);
  font-weight: 600;
}

.form__msg.is-show {
  display: block;
}

/* ========== 17. 时间轴 ========== */
.timeline {
  position: relative;
  padding-left: 42px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--line-strong);
}

.tl-item {
  position: relative;
  padding-bottom: 40px;
}

.tl-item:last-child {
  padding-bottom: 0;
}

.tl-item::before {
  content: "";
  position: absolute;
  left: -42px;
  top: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--orange-500);
  box-shadow: 0 0 0 5px var(--orange-50);
}

.tl-item time {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: var(--navy-800);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.tl-item h4 {
  margin-bottom: var(--space-2);
  font-size: var(--fs-lg);
}

.tl-item p {
  font-size: var(--fs-sm2);
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 640px;
}

/* ========== 18. 价值条 ========== */
.value {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.value:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
}

.value b {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 800;
  color: var(--navy-800);
}

.value p {
  font-size: var(--fs-sm2);
  line-height: 1.85;
  color: var(--color-muted);
}

/* ========== 19. 深色条 ========== */
.band {
  position: relative;
  padding: var(--space-8) 0;
  background: var(--navy-800);
  color: rgba(255, 255, 255, 0.72);
  overflow: hidden;
}

.band__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-7);
  flex-wrap: wrap;
}

.band h2 {
  color: #fff;
  max-width: 580px;
}

.band__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ========== 20. Footer ========== */
.footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.62);
  padding: var(--space-8) 0 0;
  font-size: var(--fs-sm2);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: var(--space-7);
  padding-bottom: var(--space-7);
}

.footer .logo__mark {
  background: var(--orange-500);
}

.footer .logo__name {
  color: #fff;
}

.footer .logo__sub {
  color: rgba(255, 255, 255, 0.5);
}

.footer__about {
  margin-top: var(--space-5);
  line-height: 1.9;
  max-width: 330px;
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.68);
}

.footer h5 {
  margin-bottom: var(--space-5);
  font-size: var(--fs-sm);
  font-weight: 800;
  color: #fff;
}

.footer__links {
  display: grid;
  gap: 11px;
}

.footer__links a {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.62);
  transition: color var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.footer__links a:hover {
  color: var(--orange-300);
  transform: translateX(5px);
}

.footer__contact {
  display: grid;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  line-height: 1.7;
}

.footer__contact b {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange-300);
}

.footer__contact a {
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--dur-fast) var(--ease-out);
}

.footer__contact a:hover {
  color: var(--orange-300);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding: var(--space-5) 0 var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
}

.footer__beian {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer__beian a {
  padding: 5px 15px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.86);
  font-weight: 600;
  transition: background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.footer__beian a:hover {
  background: var(--orange-500);
  color: #fff;
}

/* ========== 21. 内页 Hero ========== */
.phero {
  position: relative;
  padding: 96px 0 88px;
  overflow: hidden;
}

.phero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(43, 46, 58, 0.08) 1.4px, transparent 1.4px);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse at 24% 24%, #000 6%, transparent 68%);
  mask-image: radial-gradient(ellipse at 24% 24%, #000 6%, transparent 68%);
  pointer-events: none;
}

.phero__inner {
  position: relative;
  z-index: 2;
  max-width: 820px;
}

.phero h1 {
  font-size: clamp(34px, 4.8vw, var(--fs-4xl));
}

.phero .lead {
  margin-top: var(--space-5);
}

.crumbs {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 18px;
  margin-bottom: var(--space-6);
  border-radius: var(--radius-pill);
  background: var(--white);
  box-shadow: var(--shadow-1);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--navy-500);
}

.crumbs a {
  color: var(--navy-800);
  transition: color var(--dur-fast) var(--ease-out);
}

.crumbs a:hover {
  color: var(--orange-600);
}

.crumbs span {
  opacity: 0.4;
}

/* ========== 22. 正文 ========== */
.prose {
  max-width: 780px;
}

.prose p {
  margin-bottom: var(--space-5);
  font-size: var(--fs-base);
  line-height: 1.95;
  color: var(--color-muted);
}

.prose h3 {
  margin: var(--space-7) 0 var(--space-4);
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--navy-800);
}

.prose ul {
  margin: 0 0 var(--space-5);
  display: grid;
  gap: 10px;
}

.prose ul li {
  position: relative;
  padding-left: 24px;
  font-size: var(--fs-base);
  line-height: 1.85;
  color: var(--color-muted);
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange-500);
}

.notice {
  margin: var(--space-6) 0;
  padding: 24px 28px;
  border-radius: var(--radius-md);
  background: var(--orange-50);
  border: 2px solid var(--orange-200);
}

.notice b {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--fs-base);
  font-weight: 800;
  color: var(--orange-700);
}

.notice p {
  margin: 0;
  font-size: var(--fs-sm2);
  line-height: 1.85;
  color: var(--orange-800);
}

.notice p a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ========== 23. 入场序列 ========== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

.reveal-d1 {
  transition-delay: 90ms;
}
.reveal-d2 {
  transition-delay: 180ms;
}
.reveal-d3 {
  transition-delay: 270ms;
}
.reveal-d4 {
  transition-delay: 360ms;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ========== 24. 响应式 ========== */
@media (max-width: 1120px) {
  .hero__inner {
    gap: var(--space-7);
  }
  .hero__float--tl {
    left: -16px;
  }
  .hero__float--br {
    right: -14px;
  }
  .split,
  .contact-grid {
    gap: var(--space-7);
  }
  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1.4fr;
  }
  .footer__grid > div:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .section {
    padding: var(--space-8) 0;
  }
  .section-sm {
    padding: var(--space-7) 0;
  }
  .wrap {
    padding: 0 24px;
  }

  .nav {
    position: fixed;
    top: 82px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-4) 24px var(--space-6);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    background: var(--white);
    box-shadow: var(--shadow-3);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--dur-base) var(--ease-out);
    max-height: calc(100vh - 82px);
    overflow-y: auto;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: var(--fs-md);
    background: var(--bg);
  }

  .nav__link.is-active {
    background: var(--navy-800);
    color: #fff;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.is-open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .header__actions .btn {
    display: none;
  }

  .hero {
    padding: 76px 0 84px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }

  .hero__card {
    transform: none;
  }

  .hero__float--tl,
  .hero__float--br {
    display: none;
  }

  .grid-4,
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .split,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-7);
  }

  .split--reverse .split__visual {
    order: 0;
  }

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

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

  .cta {
    padding: 60px 28px;
  }

  .band__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .form {
    padding: 30px 26px;
  }
}

@media (max-width: 640px) {
  .wrap {
    padding: 0 18px;
  }

  .section {
    padding: var(--space-7) 0;
  }

  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .hero__meta-item {
    flex: 1 1 100px;
  }

  .hero__cta .btn {
    width: 100%;
  }

  .form__row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer__grid > div:last-child {
    grid-column: auto;
  }

  .cta__actions .btn,
  .band__actions .btn {
    width: 100%;
  }

  .card {
    padding: 28px 24px;
  }

  .faq__q {
    padding: 20px 22px;
    font-size: var(--fs-base);
  }

  .faq__a p {
    padding: 0 22px 22px;
  }
}

@media (min-width: 901px) {
  .card--centered {
    grid-column: 1 / -1;
    max-width: 440px;
    margin: 0 auto;
    width: 100%;
  }
}

/* ========== 25. 打印 ========== */
@media print {
  .header,
  .hero__visual,
  .cta,
  .band,
  .atmos {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
}