:root {
  color-scheme: dark;
  --color-bg: #050505;
  --color-surface: #141414;
  --color-surface-raised: #1c1c1c;
  --color-text: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-accent: #ffffff;
  --color-accent-muted: #0a84ff;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.14);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-4xl: clamp(2rem, 4vw, 2.75rem);
  --font-size-hero: clamp(2.25rem, 5vw, 3.5rem);
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --section-padding: clamp(3.5rem, 7vw, 5rem);
  --container-max: 960px;
  --nav-height: 56px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --success: #34c759;
  --error: #ff453a;
}

*,
*::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(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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

.section--border {
  border-top: 1px solid var(--color-border);
}

.section-header {
  margin-bottom: var(--space-10);
}

.section-header--center {
  text-align: center;
  max-width: 36rem;
  margin-inline: auto;
  margin-bottom: var(--space-10);
}

.section-header p,
.section-header .section-lede {
  margin-top: var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.heading-section {
  font-size: var(--font-size-4xl);
  font-weight: 600;
}

.heading-card {
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.text-small {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ── Nav ── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(5, 5, 5, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: var(--space-4);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  font-size: var(--font-size-sm);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.nav__logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  font-size: 0.6rem;
  font-weight: 700;
  flex-shrink: 0;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  transition: color 0.15s ease, background 0.15s ease;
}

.nav__link:hover,
.nav__link[aria-current="page"] {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.nav__hamburger,
.nav__hamburger::before,
.nav__hamburger::after {
  width: 18px;
  height: 1.5px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease;
}

.nav__hamburger {
  position: relative;
}

.nav__hamburger::before,
.nav__hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav__hamburger::before {
  top: -6px;
}

.nav__hamburger::after {
  bottom: -6px;
}

.nav__toggle[aria-expanded="true"] .nav__hamburger {
  background-color: transparent;
}

.nav__toggle[aria-expanded="true"] .nav__hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

@media (max-width: 640px) {
  .nav__toggle {
    display: flex;
  }

  .nav.nav--open {
    height: 100vh;
    height: 100dvh;
    background: var(--color-bg);
  }

  .nav__menu {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    position: absolute;
    inset: var(--nav-height) 0 0;
  }

  .nav.nav--open .nav__menu {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    gap: var(--space-4);
  }

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

/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

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

.btn--primary:hover {
  opacity: 0.88;
}

.btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.05);
}

.btn--small {
  padding: 0.55rem 1.1rem;
  font-size: var(--font-size-xs);
}

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

/* ── Hero ── */

.hero {
  position: relative;
  padding: var(--space-16) 0 var(--space-12);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 50% -20%, rgba(255, 255, 255, 0.07), transparent),
    radial-gradient(ellipse 40% 30% at 90% 40%, rgba(10, 132, 255, 0.06), transparent);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: 38rem;
  margin-inline: auto;
}

.hero__label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.85rem;
  margin-bottom: var(--space-5);
}

.hero__title {
  font-size: var(--font-size-hero);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.65;
}

.hero__actions {
  justify-content: center;
}

/* ── App cards ── */

.apps-grid {
  display: grid;
  gap: var(--space-5);
}

.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.app-card:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface-raised);
}

.app-card__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.app-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  object-fit: cover;
  flex-shrink: 0;
}

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

.app-card__badge {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.app-card__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  font-size: var(--font-size-sm);
  line-height: 1.65;
}

.app-card__features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.app-card__features li {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.7rem;
}

.app-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ── Features ── */

.features__grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.features__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.features__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.features__icon svg {
  width: 20px;
  height: 20px;
}

.features__card h3 {
  margin-bottom: var(--space-2);
}

.about-text {
  color: var(--color-text-secondary);
  max-width: 36rem;
  margin: var(--space-10) auto 0;
  text-align: center;
  line-height: 1.65;
}

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

/* ── Inner pages ── */

.page-main {
  padding-top: var(--space-10);
  padding-bottom: var(--space-16);
}

.page-header {
  padding-bottom: var(--space-8);
  margin-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-3);
}

.page-header .lede {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.page-main h2 {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-xl);
}

.page-main h3 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
  font-size: var(--font-size-base);
}

.page-main p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.page-main a {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-main hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-10) 0;
}

.page-main table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: var(--font-size-sm);
}

.page-main th,
.page-main td {
  border: 1px solid var(--color-border);
  padding: 0.65rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.page-main th {
  background: var(--color-surface);
  color: var(--color-text);
}

.page-main td {
  color: var(--color-text-secondary);
}

.page-main ul {
  padding-left: 1.25rem;
  list-style: disc;
  margin-bottom: var(--space-4);
}

.page-main li {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

/* ── Support ── */

.support-layout {
  display: grid;
  gap: var(--space-10);
}

@media (min-width: 768px) {
  .support-layout {
    grid-template-columns: 1fr 1.1fr;
    align-items: start;
  }
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) 0;
}

.faq-item:first-child {
  padding-top: 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-base);
  color: var(--color-text);
}

.faq-item p {
  margin: 0;
  font-size: var(--font-size-sm);
}

.contact-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.contact-panel h2 {
  margin-top: 0;
  color: var(--color-text);
}

.contact-panel > p {
  margin-bottom: var(--space-6);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-form label {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.contact-form input,
.contact-form textarea {
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  transition: border-color 0.15s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-border-strong);
}

.contact-form textarea {
  resize: vertical;
  min-height: 130px;
}

.contact-form__captcha {
  min-height: 65px;
}

.contact-form button[type="submit"] {
  align-self: flex-start;
  margin-top: var(--space-2);
}

.hp-field {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

.form-status {
  font-size: var(--font-size-sm);
  margin: 0;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
}

.form-status[hidden] {
  display: none;
}

.form-status--success {
  color: var(--success);
  background: rgba(52, 199, 89, 0.1);
  border: 1px solid rgba(52, 199, 89, 0.25);
}

.form-status--error {
  color: var(--error);
  background: rgba(255, 69, 58, 0.1);
  border: 1px solid rgba(255, 69, 58, 0.25);
}

/* ── Footer ── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
}

.site-footer__nav a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}

.site-footer__nav a:hover {
  color: var(--color-text);
}

.site-footer__copy {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

@media (max-width: 600px) {
  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}