/* ============================================
   Teown Brand Site — Design System
   ============================================ */

:root {
  /* Brand */
  --color-primary: #125CA9;
  --color-primary-dark: #122F89;
  --color-primary-light: #008CD4;
  --color-primary-ghost: rgba(18, 92, 169, 0.08);

  /* Neutral */
  --color-text: #1a1a2e;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;

  /* Spacing */
  --section-padding: 100px 0;
  --section-padding-mobile: 64px 0;
  --content-width: 1280px;
  --nav-height: 60px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

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

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

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

.container {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
}

/* ============================================
   Typography
   ============================================ */

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

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--duration-base) var(--ease-out);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(18, 92, 169, 0.3);
}

.btn--outline {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: inset 0 0 0 1.5px var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary-ghost);
  transform: translateY(-1px);
}

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

/* ============================================
   Navigation
   ============================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base), box-shadow var(--duration-base);
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__logo img {
  height: 28px;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--duration-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link--cta {
  color: var(--color-primary);
  font-weight: 600;
}

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 101;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast);
}

.nav__toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: right var(--duration-slow) var(--ease-in-out);
    padding: 48px 40px;
  }

  .nav__links.active {
    right: 0;
  }

  .nav__link {
    font-size: 18px;
  }
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--nav-height));
  background: var(--color-bg);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(18, 92, 169, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 80% at 80% 80%, rgba(0, 140, 212, 0.03) 0%, transparent 60%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
  max-width: 720px;
  padding: 80px 24px;
  animation: fadeInUp 0.8s var(--ease-out);
}

.hero__title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.hero__title-line {
  display: block;
}

.hero__subtitle {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

@media (max-width: 768px) {
  .hero__actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }

  .hero__actions .btn {
    width: 100%;
  }
}

/* ============================================
   Clients Logo Wall
   ============================================ */

.clients {
  padding: 56px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.clients__label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.clients__wall {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px 56px;
}

.client-item {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text);
  opacity: 0.55;
  transition: opacity var(--duration-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.client-item img {
  height: 32px;
  width: auto;
  opacity: 0.5;
  transition: opacity var(--duration-fast);
  filter: grayscale(100%);
}

.client-item:hover img {
  opacity: 0.8;
}

.client-item:hover {
  opacity: 0.8;
}

@media (max-width: 768px) {
  .clients {
    padding: 40px 0;
  }

  .clients__wall {
    gap: 24px 32px;
  }

  .client-item {
    font-size: 18px;
  }
}

/* ============================================
   Section Shared
   ============================================ */

.section {
  padding: var(--section-padding);
  overflow: hidden;
}

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

.section__header {
  text-align: center;
  margin-bottom: 48px;
}

.section__title {
  font-size: clamp(28px, 3.5vw, 36px);
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section__title--left {
  text-align: left;
}

.section__subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .section {
    padding: var(--section-padding-mobile);
  }

  .section__header {
    margin-bottom: 36px;
  }
}

/* ============================================
   Cases
   ============================================ */

.cases__filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.cases__filter {
  padding: 7px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: #f3f4f6;
  color: var(--color-text);
  transition: all var(--duration-fast) var(--ease-out);
}

.cases__filter:hover {
  background: #e5e7eb;
}

.cases__filter--active {
  background: var(--color-primary);
  color: var(--color-white);
}

.cases__filter--active:hover {
  background: var(--color-primary-dark);
}

.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.case-card.hidden {
  display: none;
}

.case-card__image {
  width: 100%;
  aspect-ratio: 5 / 4;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
}

.case-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-card__image span {
  opacity: 0.5;
}

.case-card__body {
  padding: 20px;
}

.case-card__tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
  background: var(--color-primary-ghost);
  color: var(--color-primary);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.case-card__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.case-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.cases__more {
  text-align: center;
  margin-top: 36px;
}

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

@media (max-width: 768px) {
  .cases__filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .cases__filter {
    flex-shrink: 0;
  }

  .cases__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* ============================================
   Services
   ============================================ */

.services__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

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

.service-card__icon {
  font-size: 36px;
  margin-bottom: 16px;
  line-height: 1;
}

.service-card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.service-card__desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

@media (max-width: 1200px) {
  .services__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .services__grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .service-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    text-align: left;
    gap: 16px;
    padding: 20px;
  }

  .service-card__icon {
    font-size: 28px;
    margin-bottom: 0;
    flex-shrink: 0;
  }
}

/* ============================================
   About
   ============================================ */

.about__layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 80px;
  align-items: center;
}

.about__text p {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.about__text p:last-of-type {
  margin-bottom: 32px;
}

.about__values {
  display: flex;
  gap: 48px;
}

.value-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.value-item strong {
  font-size: 18px;
  font-weight: 650;
  color: var(--color-primary);
}

.value-item span {
  font-size: 13px;
  color: var(--color-text-secondary);
}

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

.about__logo {
  width: 240px;
  height: 240px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.about__logo img {
  width: 100%;
  height: auto;
}

@media (max-width: 768px) {
  .about__layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about__values {
    gap: 28px;
  }

  .about__visual {
    order: -1;
  }

  .about__logo {
    width: 180px;
    height: 180px;
    padding: 32px;
  }
}

/* ============================================
   Contact
   ============================================ */

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: flex-start;
}

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

.contact__info-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact__icon {
  font-size: 20px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.contact__label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact__info-item a,
.contact__info-item p:last-child {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

/* Form */
.contact__form {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-ghost);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-feedback {
  margin-top: 12px;
  font-size: 14px;
  text-align: center;
  min-height: 20px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  display: none;
}

.form-feedback.success {
  display: block;
  color: #065f46;
  background: #d1fae5;
  animation: fadeIn 0.3s ease-out;
}

.form-feedback.error {
  display: block;
  color: #991b1b;
  background: #fee2e2;
  animation: fadeIn 0.3s ease-out;
}

@media (max-width: 768px) {
  .contact__layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .contact__form {
    padding: 24px 20px;
  }
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-text);
  padding: 28px 0;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .footer__inner {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}

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

/* Stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-out),
              transform 0.5s var(--ease-out);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger.visible > *:nth-child(2) { transition-delay: 80ms; }
.stagger.visible > *:nth-child(3) { transition-delay: 160ms; }
.stagger.visible > *:nth-child(4) { transition-delay: 240ms; }
.stagger.visible > *:nth-child(5) { transition-delay: 320ms; }
.stagger.visible > *:nth-child(6) { transition-delay: 400ms; }

.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Utility
   ============================================ */

/* ============================================
   WeChat QR Popup
   ============================================ */

.contact__info-item--clickable {
  cursor: pointer;
  transition: opacity var(--duration-fast);
}

.contact__info-item--clickable:hover {
  opacity: 0.7;
}

.wechat-popup {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.25s ease-out;
}

.wechat-popup__card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 280px;
  width: 100%;
}

.wechat-popup__card img {
  width: 200px;
  height: auto;
  max-height: 300px;
  margin: 0 auto 16px;
  border-radius: 8px;
}

.wechat-popup__card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

/* ============================================
   Case Detail Overlay
   ============================================ */

.case-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.25s var(--ease-out);
}

.case-overlay__content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 375px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.case-overlay__close {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 24px;
  color: var(--color-white);
  z-index: 10;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.4);
}

/* Carousel */
.case-carousel {
  width: 100%;
  aspect-ratio: 750 / 1580;
  max-height: 60vh;
  overflow: hidden;
  position: relative;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.case-carousel img,
.case-carousel video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.case-carousel video {
  background: #000;
}

.case-carousel__track {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  width: 100%;
  height: 100%;
}

.case-carousel__track::-webkit-scrollbar { display: none; }

.case-carousel__track > * {
  scroll-snap-align: start;
  flex: 0 0 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-carousel__dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 5;
}

.case-carousel__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transition: background 0.2s;
}

.case-carousel__dot.active {
  background: #fff;
}

.case-overlay__body {
  padding: 20px;
}

.case-overlay__body h2 {
  font-size: 18px;
  font-weight: 650;
  margin: 8px 0;
  color: var(--color-text);
}

.case-overlay__body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.case-overlay__actions {
  display: flex;
  gap: 10px;
}

.case-overlay__actions .btn {
  flex: 1;
  justify-content: center;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}