/* =============================================================================
   Rhythmos — Main Stylesheet
   Mobile-first · Clean · Calm
   ============================================================================= */

/* ---------------------------------------------------------------------------
   1. Custom Properties
   --------------------------------------------------------------------------- */
:root {
  /* Palette */
  --clr-bg:          #F7F6F2;
  --clr-surface:     #FFFFFF;
  --clr-surface-2:   #F1F3F7;
  --clr-text:        #18181B;
  --clr-text-2:      #52525B;
  --clr-text-3:      #A1A1AA;
  --clr-accent:      #3D6B9F;
  --clr-accent-lt:   #E8EFF7;
  --clr-tg:          #229ED9;
  --clr-tg-dk:       #1A87BF;
  --clr-border:      #E4E4E7;
  --clr-check:       #16A34A;

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Spacing */
  --pad-x:      clamp(1.25rem, 5vw, 2.5rem);
  --section-y:  clamp(3.5rem, 8vw, 5.5rem);

  /* Shape */
  --r-sm:   8px;
  --r-md:   12px;
  --r-lg:   20px;
  --r-pill: 100px;

  /* Max width */
  --max-w: 1100px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,.08);
}

/* ---------------------------------------------------------------------------
   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);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
p { max-width: 68ch; }
button { font-family: inherit; cursor: pointer; }

/* ---------------------------------------------------------------------------
   3. Typography
   --------------------------------------------------------------------------- */
h1 {
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

/* ---------------------------------------------------------------------------
   4. Layout
   --------------------------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.section { padding: var(--section-y) 0; }
.section--alt { background: var(--clr-surface); }

.section--dark {
  background: var(--clr-text);
  color: #fff;
}

.section__header { margin-bottom: clamp(2rem, 5vw, 3rem); }

.section__tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--clr-accent);
  background: var(--clr-accent-lt);
  padding: 4px 12px;
  border-radius: var(--r-pill);
  margin-bottom: 12px;
}

.section__title { margin-bottom: 12px; }

.section__subtitle {
  font-size: 1.0625rem;
  color: var(--clr-text-2);
}

.text-center { text-align: center; }
.text-center p { margin-left: auto; margin-right: auto; }

/* ---------------------------------------------------------------------------
   5. Buttons
   --------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--r-sm);
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  border: 2px solid transparent;
  transition: background .18s ease, color .18s ease,
              border-color .18s ease, box-shadow .18s ease, transform .15s ease;
  white-space: nowrap;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.btn__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Telegram blue — main CTA */
.btn--primary {
  background: var(--clr-tg);
  color: #fff;
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--clr-tg-dk);
  transform: translateY(-1px);
  box-shadow: 0 4px 18px rgba(34,158,217,.38);
}

/* Outline */
.btn--outline {
  background: transparent;
  color: var(--clr-text);
  border-color: var(--clr-border);
}
.btn--outline:hover { border-color: var(--clr-text); }

/* Ghost */
.btn--ghost {
  background: transparent;
  color: var(--clr-text-2);
}
.btn--ghost:hover { color: var(--clr-text); }

/* Inverted (on dark bg) */
.btn--inv {
  background: rgba(255,255,255,.12);
  color: #fff;
  border-color: rgba(255,255,255,.25);
}
.btn--inv:hover { background: rgba(255,255,255,.2); }

/* Sizes */
.btn--lg { padding: 15px 30px; font-size: 1rem; }
.btn--sm { padding: 9px 18px; font-size: 0.8125rem; }

/* ---------------------------------------------------------------------------
   6. Header
   --------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 242, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  transition: box-shadow .2s;
}

.header.is-scrolled { box-shadow: var(--shadow-sm); }

.header__inner {
  display: flex;
  align-items: center;
  height: 62px;
  gap: 24px;
}

.header__logo {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--clr-text);
  flex-shrink: 0;
  transition: opacity .15s;
}
.header__logo:hover { opacity: .75; }

.header__nav {
  display: none;
  align-items: center;
  gap: 24px;
  flex: 1;
}

.header__nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-text-2);
  transition: color .15s;
}
.header__nav a:hover { color: var(--clr-text); }

.header__cta { margin-left: auto; flex-shrink: 0; }

@media (min-width: 720px) {
  .header__nav { display: flex; }
}

/* ---------------------------------------------------------------------------
   7. Hero
   --------------------------------------------------------------------------- */
.hero {
  padding: clamp(3.5rem, 10vw, 7rem) 0 clamp(2.5rem, 7vw, 4.5rem);
  text-align: center; /* centered on mobile */
}

/* ── Two-column layout ── */
.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

/* Text + CTA column */
.hero__content { width: 100%; max-width: 620px; }

.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--clr-accent);
  background: var(--clr-accent-lt);
  padding: 5px 14px;
  border-radius: var(--r-pill);
  margin-bottom: 24px;
}

.hero__title { margin-bottom: 24px; }

.hero__lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--clr-text-2);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.hero__note {
  font-size: 0.875rem;
  color: var(--clr-text-3);
}

/* ── Mockup column ── */
.hero__visual {
  width: 100%;
  max-width: 420px;
  flex-shrink: 0;
}

.hero__mockup {
  width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  box-shadow: 0 16px 48px rgba(0,0,0,.13), 0 4px 12px rgba(0,0,0,.07);
  display: block;
}

/* ── Desktop: side-by-side ── */
@media (min-width: 960px) {
  .hero { text-align: left; }

  .hero__inner {
    flex-direction: row;
    align-items: center;
    gap: clamp(40px, 6vw, 80px);
  }

  .hero__content {
    flex: 1;
    max-width: none;
  }

  /* Left-align CTA row */
  .hero__cta { justify-content: flex-start; }

  /* Left-align lead text (remove auto margins) */
  .hero__lead { margin-left: 0; }

  .hero__visual {
    flex: 0 0 clamp(300px, 38%, 460px);
    max-width: none;
  }
}

/* ---------------------------------------------------------------------------
   8. Intro
   --------------------------------------------------------------------------- */
.intro .intro__inner {
  max-width: 720px;
  margin: 0 auto;
}

.intro__text {
  font-size: clamp(1rem, 1.8vw, 1.0625rem);
  color: var(--clr-text-2);
  line-height: 1.75;
}

.intro__text + .intro__text { margin-top: 16px; }

/* ---------------------------------------------------------------------------
   9. For Whom
   --------------------------------------------------------------------------- */
.for-whom__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.for-whom__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--clr-surface);
  padding: 18px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
}

.for-whom__icon {
  flex-shrink: 0;
  font-size: 1.25rem;
  line-height: 1;
  margin-top: 1px;
}

.for-whom__text {
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  line-height: 1.5;
}

@media (min-width: 560px) {
  .for-whom__grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 960px) {
  .for-whom__grid { grid-template-columns: 1fr 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   10. How It Works — Steps
   --------------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step__num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.step__title { margin-bottom: 6px; }

.step__text {
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  max-width: none;
}

@media (min-width: 720px) {
  .steps { grid-template-columns: 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   11. Day Flow
   --------------------------------------------------------------------------- */
.day-flow-section { background: var(--clr-bg); }

.day-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.day-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}

.day-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.day-card__time {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 12px;
}

.day-card__icon {
  font-size: 2.25rem;
  margin: 0 auto 14px;
  line-height: 1;
}

.day-card__title { margin-bottom: 8px; }

.day-card__text {
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  max-width: none;
}

@media (min-width: 720px) {
  .day-flow { grid-template-columns: 1fr 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   12. What's Inside
   --------------------------------------------------------------------------- */
.inside__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.inside__item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  background: var(--clr-bg);
  padding: 14px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--clr-border);
}

.inside__item::before {
  content: "✓";
  color: var(--clr-check);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 0.875rem;
}

@media (min-width: 720px) {
  .inside__grid { grid-template-columns: 1fr 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   13. Topics (tag chips)
   --------------------------------------------------------------------------- */
.topics__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topic-tag {
  display: inline-block;
  padding: 9px 18px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-pill);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-text-2);
  transition: border-color .15s, color .15s, background .15s;
}

.topic-tag:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-lt);
}

/* ---------------------------------------------------------------------------
   14. Why Convenient
   --------------------------------------------------------------------------- */
.convenient__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  max-width: 760px;
}

.convenient__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 1rem;
  color: var(--clr-text-2);
}

.convenient__check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--clr-check);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 700;
  margin-top: 2px;
}

@media (min-width: 600px) {
  .convenient__list { grid-template-columns: 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   15. After Start
   --------------------------------------------------------------------------- */
.after-start {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 660px;
}

.after-start__item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 18px 22px;
  background: var(--clr-surface);
  border-radius: var(--r-md);
  border: 1px solid var(--clr-border);
}

.after-start__num {
  flex-shrink: 0;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--clr-accent);
  line-height: 1.4;
  min-width: 24px;
}

.after-start__text {
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  align-self: center;
}

/* ---------------------------------------------------------------------------
   16. Pricing
   --------------------------------------------------------------------------- */
.pricing__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 740px;
  margin: 0 auto;
}

.plan-card {
  background: var(--clr-surface);
  border: 2px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: 32px;
  position: relative;
}

.plan-card--featured {
  border-color: var(--clr-tg);
  box-shadow: 0 0 0 4px rgba(34,158,217,.1);
}

.plan-card__badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--clr-tg);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: var(--r-pill);
  white-space: nowrap;
}

.plan-card__name {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-card__price {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 4px;
}

.plan-card__price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--clr-text-2);
  letter-spacing: 0;
}

.plan-card__desc {
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  margin: 10px 0 24px;
  max-width: none;
}

.plan-card__features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.plan-card__feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--clr-text-2);
}

.plan-card__feature::before {
  content: "✓";
  color: var(--clr-check);
  font-weight: 700;
  flex-shrink: 0;
}

@media (min-width: 600px) {
  .pricing__grid { grid-template-columns: 1fr 1fr; }
}

/* ---------------------------------------------------------------------------
   17. Trust
   --------------------------------------------------------------------------- */
.trust { max-width: 720px; }

.trust__text {
  font-size: 1.0625rem;
  color: var(--clr-text-2);
  line-height: 1.75;
  max-width: none;
}

.trust__text + .trust__text { margin-top: 14px; }

.trust__badges {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 28px;
}

.trust__badge {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--clr-text-2);
}

.trust__badge-icon { font-size: 1.25rem; flex-shrink: 0; }

@media (min-width: 600px) {
  .trust__badges { flex-direction: row; flex-wrap: wrap; }
  .trust__badge { flex: 0 0 auto; }
}

/* ---------------------------------------------------------------------------
   18. FAQ
   --------------------------------------------------------------------------- */
.faq__list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq__item {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.faq__item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background .15s;
}

.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary:hover { background: var(--clr-accent-lt); }

.faq__arrow {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--clr-text-3);
  transition: transform .22s ease;
}

.faq__item[open] .faq__arrow { transform: rotate(180deg); }

.faq__item[open] summary {
  border-bottom: 1px solid var(--clr-border);
}

.faq__body {
  padding: 16px 22px 20px;
  font-size: 0.9375rem;
  color: var(--clr-text-2);
  line-height: 1.7;
}

.faq__body .link {
  color: var(--clr-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---------------------------------------------------------------------------
   19. Final CTA
   --------------------------------------------------------------------------- */
.final-cta { text-align: center; }

.final-cta__title {
  color: #fff;
  margin-bottom: 14px;
}

.final-cta__sub {
  font-size: 1.0625rem;
  color: rgba(255,255,255,.65);
  margin: 0 auto 36px;
  max-width: 480px;
}

.final-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ---------------------------------------------------------------------------
   20. Footer
   --------------------------------------------------------------------------- */
.footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: clamp(2.5rem, 6vw, 4rem) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.footer__brand {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.footer__tagline {
  font-size: 0.8125rem;
  color: var(--clr-text-3);
  margin-top: 4px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--clr-text-2);
  transition: color .15s;
}
.footer__links a:hover { color: var(--clr-text); }

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

.footer__copy {
  font-size: 0.8125rem;
  color: var(--clr-text-3);
}

.footer__disclaimer {
  font-size: 0.8125rem;
  color: var(--clr-text-3);
  line-height: 1.6;
  max-width: 560px;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
  }
  .footer__left { flex: 0 0 auto; }
}

/* ---------------------------------------------------------------------------
   21. Prose pages (privacy / terms)
   --------------------------------------------------------------------------- */
.prose {
  max-width: 720px;
  margin: 0 auto;
}

.prose h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 8px;
}

.prose__date {
  font-size: 0.875rem;
  color: var(--clr-text-3);
  margin-bottom: 40px;
  max-width: none;
}

.prose h2 {
  font-size: 1.25rem;
  margin: 40px 0 12px;
}

.prose p {
  font-size: 1rem;
  color: var(--clr-text-2);
  margin-bottom: 14px;
  max-width: none;
}

.prose ul {
  list-style: disc;
  padding-left: 24px;
  color: var(--clr-text-2);
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.prose li { font-size: 1rem; }

.prose strong { color: var(--clr-text); font-weight: 600; }