/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

/* Focus visible — accessible & clean */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
  outline: none;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-primary);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: var(--weight-semibold);
  color: var(--color-text);
}

/* ===== SKIP LINK (a11y) ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-weight: var(--weight-semibold);
  transition: top 0.2s;
}

.skip-link:focus {
  top: 12px;
}

/* ===== SCROLL TO TOP ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 400;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-accent);
  color: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity 400ms ease, visibility 400ms ease, transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1), background 250ms ease, box-shadow 350ms ease;
  -webkit-tap-highlight-color: transparent;
}

.scroll-top--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.scroll-top:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 6px 28px rgba(37, 99, 235, 0.45);
  transform: translateY(-2px) scale(1.05);
}

.scroll-top:active {
  transform: translateY(0) scale(0.95);
}

.scroll-top svg {
  transition: transform 250ms ease;
}

.scroll-top:hover svg {
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .scroll-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

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

.section {
  padding: var(--space-32) 0;
}

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

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

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

.section--dark p {
  color: var(--color-text-light);
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-16);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
  padding: 6px 16px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-full);
}

.section-header h2 {
  margin-bottom: var(--space-6);
}

.section-header p {
  font-size: var(--text-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 14px 32px;
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-md);
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow var(--transition-slow);
  white-space: nowrap;
  position: relative;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  /* Minimum touch target */
  min-height: 48px;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

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

.btn--primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn--outline {
  border: 2px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

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

.btn--white:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn--white:active {
  transform: translateY(0);
}

.btn--ghost {
  color: var(--color-accent);
  padding: 14px 0;
  min-height: auto;
}

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

.btn--ghost .arrow {
  transition: transform var(--transition-fast);
  display: inline-block;
}

.btn--ghost:hover .arrow {
  transform: translateX(4px);
}

/* ===== CARDS ===== */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-12);
  transition: box-shadow var(--transition-slow), border-color var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  transform: translateY(-2px);
}

.card__icon {
  width: 56px;
  height: 56px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--color-accent);
}

.card__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

.card__text {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ===== GRID ===== */
.grid {
  display: grid;
  gap: var(--space-8);
}

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

/* ===== BADGE ===== */
.badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

/* ===== DIVIDER ===== */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-16) 0;
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-light);
  padding: var(--space-6) 0;
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

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

/* ===== PAGE HERO ===== */
.page-hero {
  padding: calc(var(--header-height) + var(--space-24)) 0 var(--space-24);
  background: var(--color-bg-alt);
}

.page-hero h1 { margin-bottom: var(--space-6); }
.page-hero p { font-size: var(--text-lg); max-width: 640px; }
.page-hero__subtitle { color: var(--color-text-secondary); }

/* Static header (legal pages) */
.header--static {
  position: relative;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

/* Legal content */
.legal-content {
  padding: var(--space-16) 0 var(--space-24);
  max-width: 800px;
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.legal-content h2 {
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

.legal-content h3 {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.legal-content p {
  margin-bottom: var(--space-4);
}

.legal-content ul,
.legal-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.legal-content li {
  margin-bottom: var(--space-2);
}

.legal-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ===== TWO-COLUMN LAYOUT ===== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-24);
  align-items: center;
}

/* ===== PROCESS STEPS ===== */
.steps {
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: var(--space-8);
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), padding var(--transition-base);
  border-radius: var(--radius-md);
}

.step:hover {
  background: var(--color-bg-alt);
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.step:last-child {
  border-bottom: none;
}

.step__number {
  counter-increment: step;
  width: 56px;
  height: 56px;
  background: var(--color-accent-subtle);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  flex-shrink: 0;
}

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

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

/* ===== TAGS ===== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  padding: 8px 14px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.tag:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-color: var(--color-accent-light);
  transform: translateY(-1px);
}

/* ===== STATS ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.stat {
  text-align: center;
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-base), box-shadow var(--transition-slow), transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stat:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat__value {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-snug);
}

/* ===== FEATURE LIST ===== */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.feature-item:hover {
  background: var(--color-bg-alt);
}

.feature-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  margin-top: 2px;
}

.feature-item p {
  margin: 0;
}

/* ===== UTILITY ===== */
.text-accent {
  color: var(--color-accent);
}

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