/* ========================================
   AKO Website - Global Styles
   贵州阿格装配式建筑智造有限公司
   ======================================== */

/* --- CSS Variables (Brand Colors) --- */
:root {
  --color-cream:      #FFFDF7;  /* 奶油金 - 主背景（提亮） */
  --color-dark:       #231E1C;  /* 深棕黑 - 主文字/页脚 */
  --color-gold:       #B99B5F;  /* 熔金 - 按钮/高亮 */
  --color-gray:       #C3BEB4;  /* 冷暖灰 - 边框/次要文字 */
  --color-amber:      #A08C64;  /* 琥珀金 - 辅助点缀 */

  --color-gold-hover: #a68a52;  /* 按钮悬停加深10% */
  --color-dark-light: #3a3330;  /* 深棕黑浅化 */

  --font-family: 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
  --section-gap: 48px;
  --card-padding: 32px;
  --radius-card: 12px;
  --radius-btn: 4px;
  --line-height: 1.7;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 400;
  line-height: var(--line-height);
  color: var(--color-dark);
  background-color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* --- Typography --- */
.brand-name {
  font-size: 48px;
  font-weight: 900;
  letter-spacing: 8px;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: normal;
}

.body-text {
  font-size: 14px;
  font-weight: 400;
}

.label-text {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.big-number {
  font-size: 28px;
  font-weight: 900;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
  background-color: rgba(255, 249, 240, 0.92);
  box-shadow: 0 1px 0 rgba(35, 30, 28, 0.08);
}

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

.navbar__logo {
  display: flex;
  align-items: center;
}

.navbar__logo img {
  height: 36px;
  width: auto;
  display: block;
}

.navbar__logo span {
  color: var(--color-gold);
}

.navbar__links {
  display: flex;
  gap: 32px;
}

.navbar__links a {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 1px;
  color: var(--color-dark);
  transition: color 0.2s ease;
  position: relative;
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-gold);
}

.navbar__links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-gold);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fffcf5;
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  transition: color 0.2s;
}

.mobile-menu a:hover {
  color: var(--color-gold);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  text-align: center;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background-color: var(--color-gold);
  color: #fff;
}

.btn--primary:hover {
  background-color: var(--color-gold-hover);
}

.btn--outline {
  border: 1px solid var(--color-dark);
  color: var(--color-dark);
  background: transparent;
}

.btn--outline:hover {
  background-color: rgba(35, 30, 28, 0.06);
}

.btn--large {
  padding: 16px 48px;
  font-size: 16px;
}

/* --- Cards --- */
.card {
  background: rgba(255, 255, 255, 0.35);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-card);
  padding: var(--card-padding);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 20px rgba(35, 30, 28, 0.08);
}

/* --- Page Header --- */
.page-header {
  padding: 120px 0 48px;
  text-align: center;
}

.page-header h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: 2px;
}

.page-header .subtitle {
  font-size: 13px;
  color: var(--color-amber);
  margin-top: 8px;
  letter-spacing: 1px;
}

/* --- Footer --- */
.footer {
  background-color: var(--color-dark);
  color: var(--color-gray);
  padding: 48px 0 32px;
  margin-top: var(--section-gap);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
}

.footer__brand {
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 4px;
  color: var(--color-cream);
  margin-bottom: 12px;
}

.footer__text {
  font-size: 12px;
  line-height: 1.8;
  max-width: 320px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__links a {
  font-size: 13px;
  color: var(--color-gray);
  transition: color 0.2s;
}

.footer__links a:hover {
  color: var(--color-gold);
}

.footer__bottom {
  width: 100%;
  text-align: center;
  padding-top: 32px;
  margin-top: 16px;
  border-top: 1px solid rgba(195, 190, 180, 0.15);
  font-size: 12px;
  color: rgba(195, 190, 180, 0.6);
}

/* --- Homepage softer background --- */
.page-home {
  background-color: #FFFEF9;
}

.page-home .navbar.scrolled {
  background-color: rgba(255, 252, 245, 0.92);
}

.page-home .trust {
  background: rgba(255, 255, 255, 0.18);
}

.page-home .project-scroll__item {
  background: rgba(255, 255, 255, 0.25);
}

/* --- Hero Section (Homepage) --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: url('../images/hero-bg.png') center center / cover no-repeat fixed;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(35, 30, 28, 0.18);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  padding: 0 24px;
}

.hero__title {
  font-size: 42px;
  font-weight: 900;
  color: #f5ecd5;
  letter-spacing: 6px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero__subtitle {
  font-size: 15px;
  color: rgba(245, 236, 213, 0.85);
  margin-bottom: 40px;
  letter-spacing: 1px;
  line-height: 1.8;
}

.hero__buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__buttons .btn--outline {
  border-color: #f5ecd5;
  color: #f5ecd5;
}

.hero__buttons .btn--outline:hover {
  background-color: rgba(245, 236, 213, 0.15);
}

/* --- Trust Section --- */
.trust {
  background: rgba(255, 255, 255, 0.25);
  border-top: 1px solid var(--color-gray);
  border-bottom: 1px solid var(--color-gray);
}

.trust__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.trust__item {
  padding: 24px 16px;
}

.trust__value {
  font-size: 28px;
  font-weight: 900;
  color: var(--color-gold);
  margin-bottom: 4px;
}

.trust__label {
  font-size: 12px;
  color: var(--color-amber);
  letter-spacing: 1px;
}

.trust__standard {
  text-align: center;
  margin-top: 24px;
  font-size: 13px;
  color: var(--color-amber);
  letter-spacing: 1px;
}

.trust__note {
  text-align: center;
  margin-top: 12px;
  font-size: 12px;
  color: var(--color-gray);
}

/* --- Project Scroll (Homepage) --- */
.project-scroll {
  padding: var(--section-gap) 0;
}

.project-scroll__track {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  padding: 0 24px 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.project-scroll__track::-webkit-scrollbar {
  height: 4px;
}

.project-scroll__track::-webkit-scrollbar-thumb {
  background: var(--color-gray);
  border-radius: 2px;
}

.project-scroll__item {
  flex: 0 0 300px;
  scroll-snap-align: start;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--color-gray);
  background: rgba(255, 255, 255, 0.3);
}

.project-scroll__img {
  width: 300px;
  height: 200px;
  object-fit: cover;
  display: block;
}

.project-scroll__info {
  padding: 16px;
}

.project-scroll__info h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
}

.project-scroll__info p {
  font-size: 12px;
  color: var(--color-amber);
}

/* --- Products Grid --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  cursor: pointer;
}

.product-card__img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 16px;
  display: block;
}

.product-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--color-gold);
}

.product-card__name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.product-card__tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.product-card__tag {
  font-size: 11px;
  letter-spacing: 1px;
  padding: 4px 10px;
  border: 1px solid var(--color-gray);
  border-radius: 2px;
  color: var(--color-amber);
}

.product-card__detail {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-gray);
}

.product-card__detail.open {
  display: block;
}

.product-card__detail table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

.product-card__detail td {
  padding: 8px 0;
  font-size: 13px;
  border-bottom: 1px solid rgba(195, 190, 180, 0.4);
}

.product-card__detail td:first-child {
  color: var(--color-amber);
  width: 40%;
}

.product-card__toggle {
  font-size: 12px;
  color: var(--color-gold);
  cursor: pointer;
  letter-spacing: 1px;
  margin-top: 8px;
  display: inline-block;
}

.product-card__toggle:hover {
  color: var(--color-gold-hover);
}

/* --- Projects Grid --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.project-card__img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}

.project-card__body {
  padding: 24px 32px 32px;
}

.project-card__tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.project-card__tag {
  font-size: 11px;
  letter-spacing: 1px;
  padding: 3px 8px;
  border: 1px solid var(--color-gray);
  border-radius: 2px;
  color: var(--color-amber);
}

.project-card__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-card__desc {
  font-size: 13px;
  color: var(--color-amber);
  line-height: 1.8;
}

/* --- Tech Section --- */
.tech-params {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
  margin-bottom: var(--section-gap);
}

.tech-param {
  padding: 40px 16px;
  background: rgba(255, 255, 255, 0.3);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-card);
}

.tech-param__value {
  font-size: 36px;
  font-weight: 900;
  color: var(--color-gold);
  margin-bottom: 4px;
}

.tech-param__unit {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-dark);
}

.tech-param__label {
  font-size: 12px;
  color: var(--color-amber);
  margin-top: 8px;
  letter-spacing: 1px;
}

.tech-cert {
  text-align: center;
  padding: 40px;
  background: rgba(255, 255, 255, 0.25);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-card);
  margin-bottom: var(--section-gap);
}

.tech-cert__standard {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gold);
  margin-bottom: 8px;
}

.tech-cert__desc {
  font-size: 13px;
  color: var(--color-amber);
}

.tech-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
  margin-bottom: var(--section-gap);
}

.tech-summary__item {
  padding: 24px;
}

.tech-summary__value {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.tech-summary__label {
  font-size: 12px;
  color: var(--color-amber);
  letter-spacing: 1px;
}

.tech-source {
  text-align: center;
  padding: 32px;
  font-size: 13px;
  color: var(--color-amber);
  border-top: 1px solid var(--color-gray);
}

/* --- About Section --- */
.about-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-info__item {
  margin-bottom: 24px;
}

.about-info__label {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-amber);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.about-info__value {
  font-size: 16px;
  font-weight: 700;
}

.about-philosophy {
  text-align: center;
  padding: 64px 0;
}

.about-philosophy__keywords {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 8px;
  color: var(--color-gold);
  margin-bottom: 24px;
}

.about-philosophy__text {
  font-size: 15px;
  line-height: 2;
  color: var(--color-dark);
  max-width: 600px;
  margin: 0 auto;
}

.about-origin {
  text-align: center;
  padding: 40px;
  background: rgba(255, 255, 255, 0.25);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-card);
}

.about-origin__text {
  font-size: 14px;
  line-height: 2;
  color: var(--color-amber);
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info__item {
  margin-bottom: 24px;
}

.contact-info__label {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-amber);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.contact-info__value {
  font-size: 15px;
  font-weight: 700;
}

/* Form */
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form__label {
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-amber);
  text-transform: uppercase;
}

.form__input,
.form__select,
.form__textarea {
  padding: 12px 16px;
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-btn);
  background: rgba(255, 255, 255, 0.4);
  font-size: 14px;
  color: var(--color-dark);
  transition: border-color 0.2s;
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  border-color: var(--color-gold);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23A08C64' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form__error {
  font-size: 12px;
  color: #c0392b;
  display: none;
}

.form__group.error .form__error {
  display: block;
}

.form__group.error .form__input,
.form__group.error .form__select {
  border-color: #c0392b;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 64px 0;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .navbar__links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero__title {
    font-size: 28px;
    letter-spacing: 4px;
  }

  .hero__subtitle {
    font-size: 13px;
  }

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

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

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

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

  .tech-summary {
    grid-template-columns: 1fr;
  }

  .about-info {
    grid-template-columns: 1fr;
  }

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

  .footer .container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 24px;
    letter-spacing: 2px;
  }

  .trust__grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .tech-params {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .tech-param__value {
    font-size: 28px;
  }

  .hero__buttons {
    flex-direction: column;
    align-items: center;
  }
}