/* ── Design Tokens ─────────────────────────────────────────────────────── */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1: 0.25rem; --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;   --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  /* Radii */
  --radius-sm: 0.375rem; --radius-md: 0.5rem;
  --radius-lg: 0.75rem;  --radius-xl: 1rem; --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:  cubic-bezier(0.4, 0, 1, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Syne', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

/* ── Dark Mode (Default) ─────────────────────────────────────────────── */
:root, [data-theme="dark"] {
  --color-bg:            #0d0d0b;
  --color-surface:       #141412;
  --color-surface-2:     #1a1917;
  --color-surface-offset:#1e1d1b;
  --color-border:        #2a2927;
  --color-divider:       #222120;
  --color-text:          #e8e6e1;
  --color-text-muted:    #7a7874;
  --color-text-faint:    #4a4846;
  --color-text-inverse:  #0d0d0b;
  --color-primary:       #2dd4bf;
  --color-primary-hover: #14b8a6;
  --color-primary-dim:   rgba(45, 212, 191, 0.12);
  --color-primary-glow:  rgba(45, 212, 191, 0.25);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(45, 212, 191, 0.15);
}

[data-theme="light"] {
  --color-bg:            #f7f6f2;
  --color-surface:       #ffffff;
  --color-surface-2:     #f0efeb;
  --color-surface-offset:#eae8e3;
  --color-border:        #d4d1ca;
  --color-divider:       #dcd9d5;
  --color-text:          #1a1917;
  --color-text-muted:    #6b6966;
  --color-text-faint:    #b0aea9;
  --color-text-inverse:  #f7f6f2;
  --color-primary:       #0f766e;
  --color-primary-hover: #0d6460;
  --color-primary-dim:   rgba(15, 118, 110, 0.08);
  --color-primary-glow:  rgba(15, 118, 110, 0.15);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 40px rgba(15, 118, 110, 0.1);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:            #f7f6f2;
    --color-surface:       #ffffff;
    --color-surface-2:     #f0efeb;
    --color-surface-offset:#eae8e3;
    --color-border:        #d4d1ca;
    --color-divider:       #dcd9d5;
    --color-text:          #1a1917;
    --color-text-muted:    #6b6966;
    --color-text-faint:    #b0aea9;
    --color-text-inverse:  #f7f6f2;
    --color-primary:       #0f766e;
    --color-primary-hover: #0d6460;
    --color-primary-dim:   rgba(15, 118, 110, 0.08);
    --color-primary-glow:  rgba(15, 118, 110, 0.15);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(15, 118, 110, 0.1);
  }
}

/* ── Layout ──────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-12));
}

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

/* ── Header ──────────────────────────────────────────────────────────── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding-block: var(--space-4);
  transition: background var(--transition-interactive),
              backdrop-filter var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.header--scrolled {
  background: color-mix(in oklch, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

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

.nav__link {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-interactive);
}

.nav__link:hover { color: var(--color-text); }
.nav__link--active { color: var(--accent) !important; }

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

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* ── Buttons ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

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

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

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-text-faint);
}

.btn--lg {
  padding: var(--space-3) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-block: clamp(var(--space-24), 15vw, var(--space-32));
  padding-top: calc(clamp(var(--space-24), 15vw, var(--space-32)) + 72px);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background: var(--color-bg);
}

.hero__bg-image {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: url('./assets/hero.png') center/cover no-repeat;
  opacity: 0.18;
  mask-image: linear-gradient(to bottom, transparent 0%, black 20%, black 70%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 20%, black 70%, transparent 100%);
}

[data-theme="light"] .hero__bg-image {
  opacity: 0.08;
}

.hero__glow {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px; height: 300px;
  background: radial-gradient(ellipse, var(--color-primary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary-dim);
  background: var(--color-primary-dim);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.hero__badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 14ch;
}

.hero__title span {
  color: var(--color-primary);
}

.hero__sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-16);
}

.hero__proof {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
}

.hero__proof-divider {
  width: 1px; height: 14px;
  background: var(--color-border);
}

/* ── Section Base ────────────────────────────────────────────────────── */
.section {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
}

.section__eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.7;
}

/* ── Products Section ────────────────────────────────────────────────── */
.products {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.products__header {
  text-align: center;
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.products__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr));
  gap: var(--space-6);
}

.product-card {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  overflow: hidden;
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

.product-card__glow {
  position: absolute;
  top: -60px; right: -60px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.product-card__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-dim);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-5);
}

.product-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  line-height: 1;
}

.product-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.product-card__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  max-width: 42ch;
}

.product-card__features {
  list-style: none;
  margin-bottom: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.product-card__features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: none;
}

.product-card__features li::before {
  content: '';
  width: 16px; height: 16px;
  min-width: 16px;
  border-radius: 50%;
  background: var(--color-primary-dim);
  border: 1px solid var(--color-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cpath d='M2 5l2.5 2.5L8 3' stroke='%232dd4bf' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  margin-top: 2px;
}

[data-theme="light"] .product-card__features li::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cpath d='M2 5l2.5 2.5L8 3' stroke='%230f766e' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.product-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.product-card__price {
  display: flex;
  flex-direction: column;
}

.product-card__price-amount {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1;
}

.product-card__price-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-1);
}

/* ── How it works ────────────────────────────────────────────────────── */
.how {
  background: var(--color-bg);
}

.how__header {
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: var(--space-6);
}

.step {
  position: relative;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.step:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.step__num {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.step__icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-3);
  line-height: 1;
}

.step__title {
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.step__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: none;
}

/* ── Why section ─────────────────────────────────────────────────────── */
.why {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.why__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: start;
}

@media (max-width: 900px) {
  .why__grid { grid-template-columns: 1fr; }
}

.why__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.stat-card {
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: var(--space-1);
}

.stat-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
  max-width: none;
}

/* ── CTA section ─────────────────────────────────────────────────────── */
.cta-section {
  background: var(--color-bg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section__glow {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 600px; height: 300px;
  background: radial-gradient(ellipse, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-section__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 44ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
  position: relative;
}

.cta-section__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  position: relative;
}

/* ── Footer ──────────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
  background: var(--color-surface);
}

.footer__guides {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-6);
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.footer__guides-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-right: var(--space-2);
}

.footer__guide-link {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

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

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__attribution a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

/* ── Scroll animations — IntersectionObserver-based ─────────────────── */
.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.fade-in[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-in[data-animate] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── Mobile nav ──────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav { display: none; }

  .hero__title { max-width: 100%; }

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

  .hero__proof-divider { display: none; }
}

/* ── Divider line ────────────────────────────────────────────────────── */
.divider {
  width: 48px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  margin-block: var(--space-6);
}