/* ==========================================================================
   DMB — Design System & Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables
   -------------------------------------------------------------------------- */
:root {
  --color-black: #111111;
  --color-ink: #1a1a1a;
  --color-white: #ffffff;
  --color-off-white: #f7f7f5;
  --color-gray-100: #f0f0ee;
  --color-gray-200: #e5e5e3;
  --color-gray-300: #d0d0ce;
  --color-gray-500: #8a8a88;
  --color-gray-700: #4a4a48;
  --color-accent: #111111;
  --color-focus: #2563eb;

  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-display: "Outfit", "Noto Sans TC", sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: clamp(1.75rem, 3vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 5vw, 3.5rem);
  --text-5xl: clamp(2.75rem, 6vw, 4.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 5rem;
  --space-16: 7rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);

  --header-h: 72px;
  --container: 1120px;
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --z-header: 100;
  --z-menu: 200;
  --z-back-top: 90;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-white);
  min-height: 100dvh;
}

body.menu-open {
  overflow: hidden;
  touch-action: none;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-black);
}

h1 {
  font-size: var(--text-5xl);
}

h2 {
  font-size: var(--text-4xl);
}

h3 {
  font-size: var(--text-2xl);
}

p {
  color: var(--color-gray-700);
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   3. Layout
   -------------------------------------------------------------------------- */
.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-12);
}

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

.section__header {
  max-width: 640px;
  margin-bottom: var(--space-8);
}

.section__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

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

.section__desc {
  font-size: var(--text-lg);
}

.grid-2 {
  display: grid;
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

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

/* --------------------------------------------------------------------------
   4. Components — Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.75rem;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
  white-space: nowrap;
}

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

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

.btn--primary:hover {
  background: #2a2a2a;
}

.btn--outline {
  background: transparent;
  color: var(--color-black);
  border: 1.5px solid var(--color-black);
}

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

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

.btn--light:hover {
  background: var(--color-gray-100);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn--ghost:hover {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

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

/* --------------------------------------------------------------------------
   5. Components — Header (Sticky)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--color-gray-200);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

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

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

.logo__text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-black);
}

@media (max-width: 480px) {
  .logo__text {
    display: none;
  }
}

/* Desktop Nav */
.nav-desktop {
  display: none;
}

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

.nav-desktop__link {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-desktop__link:hover,
.nav-desktop__link.is-active {
  color: var(--color-black);
}

.nav-desktop__link.is-active {
  font-weight: 600;
}

.nav-desktop__dropdown {
  position: relative;
}

.nav-desktop__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  padding: var(--space-2);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition);
}

.nav-desktop__dropdown:hover .nav-desktop__dropdown-menu,
.nav-desktop__dropdown:focus-within .nav-desktop__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-desktop__dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  border-radius: var(--radius-sm);
}

.nav-desktop__dropdown-menu a:hover {
  background: var(--color-gray-100);
  color: var(--color-black);
}

.header-cta {
  display: none;
}

@media (min-width: 992px) {
  .nav-desktop {
    display: block;
  }

  .header-cta {
    display: inline-flex;
  }

  .menu-toggle {
    display: none !important;
  }
}

/* Hamburger Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  z-index: calc(var(--z-menu) + 1);
  position: relative;
}

.menu-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-black);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   6. Components — Mobile Full-Screen Overlay Menu
   -------------------------------------------------------------------------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100dvh;
  z-index: var(--z-menu);
  background: var(--color-white);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding-inline: 1rem;
  flex-shrink: 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.mobile-menu__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 1.5rem;
  color: var(--color-black);
}

.mobile-menu__nav {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-6) var(--space-5) var(--space-10);
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-4) 0;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-black);
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-menu__link.is-active {
  font-weight: 700;
}

.mobile-menu__sub {
  padding-left: var(--space-4);
  margin-bottom: var(--space-2);
}

.mobile-menu__sub a {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-base);
  color: var(--color-gray-700);
}

.mobile-menu__footer {
  flex-shrink: 0;
  padding: var(--space-5);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 992px) {
  .mobile-menu {
    display: none !important;
  }
}

/* --------------------------------------------------------------------------
   7. Components — Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100dvh - var(--header-h));
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-black);
  color: var(--color-white);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.75) 0%,
    rgba(0, 0, 0, 0.4) 100%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding-block: var(--space-12);
  max-width: 720px;
}

.hero__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-4);
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-5);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-5);
}

.hero__desc {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-8);
  max-width: 540px;
}

.hero--page {
  min-height: 42vh;
}

.hero--page .hero__content {
  padding-block: var(--space-10);
}

/* --------------------------------------------------------------------------
   8. Components — Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.card__img {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-gray-100);
}

.card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card__img img {
  transform: scale(1.04);
}

.card__body {
  padding: var(--space-5);
}

.card__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-2);
}

.card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.card__text {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.card__link {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-black);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.card__link::after {
  content: "→";
  transition: transform var(--transition);
}

.card__link:hover::after {
  transform: translateX(4px);
}

.service-card {
  padding: var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  height: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  border-color: var(--color-black);
  box-shadow: var(--shadow-sm);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--color-black);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
}

.service-card h3 {
  margin-bottom: var(--space-3);
  font-size: var(--text-xl);
}

.service-card p {
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.service-card ul {
  margin-bottom: var(--space-5);
}

.service-card li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
}

.service-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-black);
}

/* --------------------------------------------------------------------------
   9. Components — Process / Steps
   -------------------------------------------------------------------------- */
.steps {
  display: grid;
  gap: var(--space-6);
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

.step {
  counter-increment: step;
  padding: var(--space-5);
  border-top: 2px solid var(--color-black);
}

.step::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.step h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.step p {
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   10. Components — Feature List / About
   -------------------------------------------------------------------------- */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.feature-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.feature-item__num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--color-black);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
}

.feature-item h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.feature-item p {
  font-size: var(--text-sm);
}

.img-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-gray-100);
}

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

.img-frame--tall {
  aspect-ratio: 4 / 5;
}

.img-frame--wide {
  aspect-ratio: 16 / 10;
}

/* --------------------------------------------------------------------------
   11. Components — CTA Banner
   -------------------------------------------------------------------------- */
.cta-banner {
  position: relative;
  padding-block: var(--space-12);
  background: var(--color-black);
  color: var(--color-white);
  overflow: hidden;
  text-align: center;
}

.cta-banner__bg {
  position: absolute;
  inset: 0;
  opacity: 0.3;
}

.cta-banner__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-banner__content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin-inline: auto;
}

.cta-banner h2 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
}

.cta-banner .btn-group {
  justify-content: center;
}

/* --------------------------------------------------------------------------
   12. Components — Contact Form & Map
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
    align-items: start;
  }
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact-info__item h3 {
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

.contact-info__item a,
.contact-info__item p {
  font-size: var(--text-lg);
  color: var(--color-black);
  font-weight: 500;
}

.contact-info__item a:hover {
  opacity: 0.7;
}

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
}

.form__row {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 568px) {
  .form__row {
    grid-template-columns: 1fr 1fr;
  }
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form__group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-black);
}

.form__group .required {
  color: #c00;
}

.form__group input,
.form__group select,
.form__group textarea {
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  transition: border-color var(--transition);
}

.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
  outline: none;
  border-color: var(--color-black);
}

.form__group input.is-invalid,
.form__group select.is-invalid,
.form__group textarea.is-invalid {
  border-color: #c00;
}

.form__error {
  font-size: var(--text-xs);
  color: #c00;
  display: none;
}

.form__error.is-visible {
  display: block;
}

.form__success {
  display: none;
  padding: var(--space-4);
  background: #e8f5e9;
  border: 1px solid #a5d6a7;
  border-radius: var(--radius-md);
  color: #2e7d32;
  font-size: var(--text-sm);
}

.form__success.is-visible {
  display: block;
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

.map-placeholder {
  margin-top: var(--space-8);
  height: 320px;
  background: var(--color-gray-100);
  border: 1px dashed var(--color-gray-300);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
  padding: var(--space-5);
}

.map-placeholder__icon {
  width: 48px;
  height: 48px;
  border: 1.5px solid var(--color-gray-500);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-gray-500);
}

.map-placeholder p {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.map-placeholder strong {
  color: var(--color-gray-700);
  display: block;
  margin-bottom: var(--space-1);
}

/* --------------------------------------------------------------------------
   13. Components — Works Grid
   -------------------------------------------------------------------------- */
.works-grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 568px) {
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .works-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --------------------------------------------------------------------------
   14. Components — Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  padding-block: var(--space-10) var(--space-6);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.7);
}

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

.footer__grid {
  display: grid;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  margin-top: var(--space-4);
  max-width: 280px;
}

.footer__brand .logo img {
  filter: invert(1);
  height: 36px;
}

.footer__tagline {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-top: var(--space-3);
}

.footer__col h3 {
  color: var(--color-white);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__col li a,
.footer__col li {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
}

.footer__bottom {
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.45);
}

/* --------------------------------------------------------------------------
   15. Components — Back to Top
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: var(--z-back-top);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-black);
  color: var(--color-white);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: #2a2a2a;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   16. Scroll Animation
   -------------------------------------------------------------------------- */
[data-animate] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-animate-delay="1"] {
  transition-delay: 0.1s;
}

[data-animate-delay="2"] {
  transition-delay: 0.2s;
}

[data-animate-delay="3"] {
  transition-delay: 0.3s;
}

/* --------------------------------------------------------------------------
   17. Page-specific helpers
   -------------------------------------------------------------------------- */
.content-block {
  max-width: 720px;
}

.content-block p + p {
  margin-top: var(--space-4);
}

.list-check {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.list-check li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-gray-700);
}

.list-check li::before {
  content: "✓";
  flex-shrink: 0;
  font-weight: 700;
  color: var(--color-black);
}

.page-intro {
  max-width: 640px;
}

.text-link {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.text-link:hover {
  opacity: 0.6;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  [data-animate] {
    opacity: 1;
    transform: none;
  }
}