/* ========================================
   wChat Landing Page - Styles
   ======================================== */

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

:root {
  --color-bg-dark: #062C3D;
  --color-bg-darker: #001215;
  --color-bg-light: #F0F4F8;
  --color-white: #FFFFFF;
  --color-text-dark: #111F53;
  --color-text-muted: #5A6A7A;
  --color-accent: #189838;
  --color-accent-hover: #53AF34;
  --color-accent-dark: #0D7351;
  --color-gold: #FFB300;
  --color-card-border: #E2E8F0;

  --font-heading: 'Patua One', cursive;
  --font-body: 'Roboto', sans-serif;

  --header-height: 72px;
  --container-max: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-dark);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}

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

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

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn--outline:hover {
  background: var(--color-white);
  color: var(--color-bg-dark);
}

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

.btn--outline-dark:hover {
  background: var(--color-bg-dark);
  color: var(--color-white);
}

.btn--lg {
  padding: 16px 36px;
  font-size: 17px;
}

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

.btn__icon {
  font-size: 20px;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(0, 18, 21, 0.95);
  backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
}

.header__logo img {
  height: 40px;
  width: auto;
}

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

.header__link {
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  font-weight: 400;
  transition: color var(--transition);
}

.header__link:hover {
  color: var(--color-white);
}

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

.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* --- Workspace Modal --- */
.workspace-modal {
  position: absolute;
  top: calc(100% + 8px);
  right: 24px;
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  min-width: 320px;
  z-index: 1001;
}

.workspace-modal.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.workspace-modal__label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.workspace-modal__row {
  display: flex;
  gap: 8px;
}

.workspace-modal__input {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--transition);
  color: var(--color-text-dark);
}

.workspace-modal__input:focus {
  border-color: var(--color-accent);
}

.workspace-modal__btn {
  padding: 10px 20px;
  border-color: var(--color-accent);
}

.workspace-modal__hint {
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.workspace-modal__hint strong {
  color: var(--color-accent);
}

/* --- Hero --- */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: 48px;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero__highlight {
  color: var(--color-accent-hover);
}

.hero__badge {
  display: inline-block;
  background: rgba(24, 152, 56, 0.15);
  color: var(--color-accent-hover);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}

.hero__subtitle {
  font-size: 18px;
  line-height: 1.7;
  opacity: 0.85;
  margin-bottom: 36px;
  max-width: 520px;
}

/* Hero screenshot */
.hero__visual {
  display: flex;
  justify-content: center;
}

.hero__screenshot {
  width: 100%;
  max-width: 560px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.4);
}

.hero__img {
  width: 100%;
  height: auto;
  display: block;
}

/* --- Features --- */
.features {
  padding: 100px 0;
  background: var(--color-bg-light);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 36px;
  text-align: center;
  margin-bottom: 12px;
  color: var(--color-text-dark);
}

.section-title--light {
  color: var(--color-white);
}

.section-subtitle {
  text-align: center;
  font-size: 17px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 60px;
}

.section-subtitle--light {
  color: rgba(255, 255, 255, 0.7);
}

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

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 32px 28px;
  border: 1px solid var(--color-card-border);
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.feature-card__icon {
  font-size: 36px;
  color: var(--color-accent);
  margin-bottom: 16px;
  display: block;
}

.feature-card__title {
  font-family: var(--font-heading);
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--color-text-dark);
}

.feature-card__desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Screenshots Gallery --- */
.screenshots {
  padding: 100px 0;
  background: var(--color-white);
}

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

.screenshot-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--color-card-border);
  transition: all var(--transition);
}

.screenshot-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.screenshot-card img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-card__label {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  color: var(--color-text-dark);
  background: var(--color-white);
}

/* --- Pricing --- */
.pricing {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 100%);
}

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

.pricing-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 36px 28px;
  position: relative;
  transition: all var(--transition);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
}

.pricing-card--featured {
  border: 2px solid var(--color-accent);
  transform: scale(1.05);
  z-index: 1;
}

.pricing-card--featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.pricing-card__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: var(--color-white);
  padding: 4px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

.pricing-card--enterprise {
  background: linear-gradient(135deg, #0b1536 0%, #111F53 100%);
  color: var(--color-white);
}

.pricing-card--enterprise .pricing-card__features li {
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.9);
}

.pricing-card--enterprise .pricing-card__features li strong {
  color: var(--color-white);
}

.pricing-card--enterprise .pricing-card__detail {
  color: rgba(255, 255, 255, 0.6);
}

.pricing-card__header {
  text-align: center;
  margin-bottom: 28px;
}

.pricing-card__name {
  font-family: var(--font-heading);
  font-size: 24px;
  margin-bottom: 12px;
}

.pricing-card__price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-card__currency {
  font-size: 20px;
  font-weight: 500;
  opacity: 0.7;
}

.pricing-card__value {
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
}

.pricing-card__value--custom {
  font-size: 24px;
  font-weight: 500;
}

.pricing-card__period {
  font-size: 15px;
  opacity: 0.6;
}

.pricing-card__features {
  margin-bottom: 28px;
}

.pricing-card__features li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-card-border);
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.pricing-card__features li:last-child {
  border-bottom: none;
}

.pricing-card__features li strong {
  color: var(--color-text-dark);
  font-weight: 500;
}

.pricing-card__detail {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Outline button in dark card */
.pricing-card--enterprise .btn--outline {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

.pricing-card--enterprise .btn--outline:hover {
  background: var(--color-white);
  color: var(--color-text-dark);
}

/* --- CTA --- */
.cta {
  padding: 100px 0;
  background: var(--color-bg-light);
}

.cta__inner {
  text-align: center;
}

.cta__title {
  font-family: var(--font-heading);
  font-size: 36px;
  margin-bottom: 16px;
  color: var(--color-text-dark);
}

.cta__text {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Footer --- */
.footer {
  padding: 40px 0;
  background: var(--color-bg-darker);
  color: rgba(255, 255, 255, 0.6);
}

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

.footer__brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer__brand img {
  height: 32px;
  opacity: 0.7;
}

.footer__copy {
  font-size: 13px;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 14px;
  transition: color var(--transition);
}

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

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

/* Tablet */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__visual {
    order: -1;
  }

  .hero__screenshot {
    max-width: 480px;
  }

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

  .screenshots__grid .screenshot-card:last-child {
    grid-column: 1 / -1;
    max-width: 480px;
    margin: 0 auto;
  }

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

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

  .pricing-card--featured {
    transform: scale(1);
  }

  .pricing-card--featured:hover {
    transform: translateY(-4px);
  }

  .pricing-card--enterprise {
    grid-column: 1 / -1;
    max-width: 480px;
    margin: 0 auto;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(0, 18, 21, 0.98);
    flex-direction: column;
    align-items: center;
    padding: 24px;
    gap: 20px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

  .header__nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .header__hamburger {
    display: flex;
  }

  .header__hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .header__hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero__title {
    font-size: 32px;
  }

  .hero__subtitle {
    font-size: 16px;
  }

  .hero__screenshot {
    max-width: 100%;
  }

  .screenshots {
    padding: 60px 0;
  }

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

  .screenshots__grid .screenshot-card:last-child {
    max-width: 100%;
  }

  .features {
    padding: 60px 0;
  }

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

  .section-title {
    font-size: 28px;
  }

  .pricing {
    padding: 60px 0;
  }

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

  .pricing-card--enterprise {
    max-width: 100%;
  }

  .cta {
    padding: 60px 0;
  }

  .cta__title {
    font-size: 28px;
  }

  .footer__inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

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

  .workspace-modal {
    left: 24px;
    right: 24px;
    min-width: auto;
  }
}

/* FAQ */
.faq {
  padding: 80px 0;
  background: var(--color-bg-light);
}

.faq__list {
  max-width: 820px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq__item {
  background: var(--color-white);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.faq__item[open] {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(24, 152, 56, 0.08);
}

.faq__question {
  cursor: pointer;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text-dark);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::after {
  content: "+";
  font-size: 24px;
  font-weight: 300;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq__item[open] .faq__question::after {
  content: "−";
}

.faq__answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.faq__answer p {
  margin: 0;
}

.faq__answer a {
  color: var(--color-accent);
  text-decoration: none;
}

.faq__answer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .faq {
    padding: 60px 0;
  }
  .faq__question {
    font-size: 15px;
    padding: 16px 18px;
  }
  .faq__answer {
    padding: 0 18px 16px;
    font-size: 14px;
  }
}

/* Stats band */
.stats {
  padding: 60px 0;
  background: var(--color-bg-dark);
  color: var(--color-white);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.stats__item {
  text-align: center;
}

.stats__number {
  font-family: 'Patua One', serif;
  font-size: 64px;
  line-height: 1;
  color: var(--color-accent-hover);
  margin-bottom: 12px;
}

.stats__label {
  font-size: 15px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  max-width: 240px;
  margin-inline: auto;
}

@media (max-width: 768px) {
  .stats {
    padding: 40px 0;
  }
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }
  .stats__number {
    font-size: 44px;
  }
  .stats__label {
    font-size: 14px;
  }
}

/* Why section */
.why {
  padding: 80px 0;
  background: var(--color-white);
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 40px;
}

.why__card {
  background: var(--color-bg-light);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.why__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.why__icon {
  font-size: 36px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.why__title {
  font-size: 19px;
  font-weight: 500;
  color: var(--color-text-dark);
  margin: 0 0 12px;
}

.why__desc {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

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

@media (max-width: 640px) {
  .why {
    padding: 60px 0;
  }
  .why__grid {
    grid-template-columns: 1fr;
  }
}