/* ============================================================
   SPARK PULSE — Landing Page Design System
   Tone: warm · calm · liquid · momentum · cognitive safety
   ============================================================ */

/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:          #FAF8F5;
  --bg-warm:     #F5F0E8;
  --ink:         #1C1410;
  --ink-muted:   #5A5C5E;
  --ink-ghost:   #BEBAB4;
  --orange:      #FF8C00;
  --orange-soft: #FFF0DC;
  --green:       #82C91E;
  --green-soft:  #F0FAD8;
  --blue:        #4A9EFF;
  --blue-soft:   #EBF4FF;
  --amber:       #E8A838;

  --font-serif:  'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:   -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:   'SF Mono', 'Fira Code', monospace;

  --radius-sm:   8px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --radius-xl:   40px;

  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ── Typography scale ────────────────────────────────────────── */
.t-display {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.t-headline {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.t-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 600;
  line-height: 1.3;
}
.t-body   { font-size: 1.05rem; line-height: 1.75; color: var(--ink-muted); }
.t-small  { font-size: 0.875rem; line-height: 1.6; color: var(--ink-muted); }
.t-label  { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-ghost); }
.t-mono   { font-family: var(--font-mono); }

/* ── Layout ──────────────────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 60px); }
.section   { padding: clamp(80px, 12vw, 160px) 0; }

/* ── Nav ─────────────────────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px clamp(20px, 5vw, 60px);
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: box-shadow 0.3s;
}
nav.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.06); }
.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem; font-weight: 700;
  display: flex; align-items: center; gap: 8px;
}
.nav-icon {
  width: 28px; height: 28px;
  border-radius: 7px;
  object-fit: cover;
  flex-shrink: 0;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}
.nav-cta {
  background: var(--ink);
  color: #fff;
  padding: 10px 22px;
  border-radius: 100px;
  font-size: 0.875rem; font-weight: 600;
  transition: all 0.2s var(--ease-out);
  cursor: pointer; border: none;
}
.nav-cta:hover { background: var(--orange); transform: translateY(-1px); }

/* ── Hero ────────────────────────────────────────────────────── */
#hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding-bottom: clamp(60px, 10vw, 120px);
  padding-top: 120px;
  position: relative;
  overflow: hidden;
}

.hero-bg-text {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-serif);
  font-size: clamp(140px, 28vw, 340px);
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 1px rgba(26,28,30,0.04);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
}

.hero-content { position: relative; z-index: 2; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--orange-soft);
  color: var(--orange);
  padding: 7px 14px; border-radius: 100px;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.hero-tag svg { width: 14px; height: 14px; }

.hero-headline { margin-bottom: 24px; }
.hero-headline em {
  font-style: normal;
  background: linear-gradient(135deg, var(--orange), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--ink-muted);
  max-width: 500px;
  line-height: 1.65;
  margin-bottom: 44px;
}

.hero-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink);
  color: #fff;
  padding: 16px 32px;
  border-radius: 100px;
  font-size: 1rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: all 0.25s var(--ease-out);
  position: relative; overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--orange), var(--amber));
  opacity: 0;
  transition: opacity 0.25s;
}
.btn-primary:hover::after { opacity: 1; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(255,140,0,0.28); }
.btn-primary span { position: relative; z-index: 1; }

.hero-note { font-size: 0.825rem; color: var(--ink-ghost); }

.hero-scroll {
  position: absolute; bottom: 32px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  opacity: 0.35;
  animation: scroll-bounce 2s ease-in-out infinite;
}
.hero-scroll span { font-size: 0.7rem; letter-spacing: 0.08em; color: var(--ink-ghost); }
@keyframes scroll-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ── Wave divider ────────────────────────────────────────────── */
.wave-divider { line-height: 0; }
.wave-divider svg { width: 100%; }

/* ── Problem section ─────────────────────────────────────────── */
#problem {
  background: var(--ink);
  color: #fff;
  padding: clamp(80px, 12vw, 160px) 0;
}
#problem .t-label { color: rgba(255,255,255,0.3); }
#problem .t-headline { color: #fff; }
#problem em {
  font-style: normal;
  background: linear-gradient(135deg, var(--orange), var(--amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  margin-top: 60px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.problem-card {
  background: rgba(255,255,255,0.04);
  padding: 40px;
  border: 1px solid rgba(255,255,255,0.06);
  transition: background 0.3s;
}
.problem-card:hover { background: rgba(255,255,255,0.07); }
.problem-card .icon {
  font-size: 1.8rem; margin-bottom: 16px; display: block;
}
.problem-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem; font-weight: 600;
  color: #fff; margin-bottom: 8px;
}
.problem-card p { font-size: 0.95rem; color: rgba(255,255,255,0.45); line-height: 1.65; }

/* ── How it works ────────────────────────────────────────────── */
#how {
  background: var(--bg);
  padding: clamp(80px, 12vw, 160px) 0;
}
.steps-row {
  display: flex; gap: 0;
  margin-top: 64px;
  position: relative;
}
.steps-row::before {
  content: '';
  position: absolute; top: 32px; left: 48px; right: 48px; height: 1px;
  background: linear-gradient(90deg, var(--orange-soft), var(--orange), var(--orange-soft));
  z-index: 0;
}
.step {
  flex: 1; text-align: center; padding: 0 24px;
  position: relative; z-index: 1;
}
.step-num {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--orange);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px;
  font-family: var(--font-mono);
  font-size: 1.1rem; font-weight: 700;
  color: var(--orange);
  transition: all 0.3s var(--ease-spring);
}
.step:hover .step-num {
  background: var(--orange);
  color: #fff;
  transform: scale(1.1);
}
.step h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem; font-weight: 600;
  margin-bottom: 10px;
}
.step p { font-size: 0.95rem; color: var(--ink-muted); line-height: 1.65; }

/* ── Features ────────────────────────────────────────────────── */
#features {
  background: var(--bg-warm);
  padding: clamp(80px, 12vw, 160px) 0;
}
.features-header { margin-bottom: 64px; }
.feature-list { display: flex; flex-direction: column; gap: 2px; }
.feature-item {
  display: grid; grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 32px 40px;
  background: var(--bg);
  border-radius: var(--radius-md);
  transition: all 0.3s var(--ease-out);
  cursor: default;
  border: 1px solid transparent;
}
.feature-item:hover {
  transform: translateX(8px);
  border-color: currentColor;
}
.feature-item.orange { --accent: var(--orange); }
.feature-item.green  { --accent: var(--green); }
.feature-item.blue   { --accent: var(--blue); }
.feature-item.amber  { --accent: var(--amber); }
.feature-item:hover  { border-color: var(--accent, var(--orange)); }

.feature-left { display: flex; align-items: center; gap: 24px; }
.feature-icon {
  width: 52px; height: 52px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
  background: color-mix(in srgb, var(--accent, var(--orange)) 12%, transparent);
  transition: all 0.3s;
}
.feature-item:hover .feature-icon { transform: scale(1.1) rotate(-4deg); }
.feature-text h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem; font-weight: 600;
  margin-bottom: 4px;
}
.feature-text p { font-size: 0.9rem; color: var(--ink-muted); }
.feature-arrow {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent, var(--orange));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: all 0.3s var(--ease-out);
}
.feature-item:hover .feature-arrow { opacity: 1; transform: translateX(0); }

/* ── Philosophy ──────────────────────────────────────────────── */
#philosophy {
  background: var(--ink);
  color: #fff;
  padding: clamp(80px, 12vw, 160px) 0;
  overflow: hidden;
}
.philosophy-marquee {
  display: flex; gap: 0;
  overflow: hidden;
  margin-bottom: 80px;
}
.marquee-track {
  display: flex; gap: 40px;
  white-space: nowrap;
  animation: marquee 20s linear infinite;
  flex-shrink: 0;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.marquee-item {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: rgba(255,255,255,0.12);
  flex-shrink: 0;
}
.marquee-item.highlight { color: rgba(255,255,255,0.85); }

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.philosophy-card {
  padding: 36px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.03);
  transition: all 0.3s;
}
.philosophy-card:hover {
  background: rgba(255,255,255,0.06);
  transform: translateY(-4px);
}
.philosophy-card .tag {
  display: inline-block;
  padding: 4px 12px; border-radius: 100px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
  margin-bottom: 20px;
}
.philosophy-card.no-shame  .tag { background: rgba(130,201,30,0.15); color: var(--green); }
.philosophy-card.no-streak .tag { background: rgba(255,140,0,0.15); color: var(--orange); }
.philosophy-card.no-over   .tag { background: rgba(74,158,255,0.15); color: var(--blue); }
.philosophy-card h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem; font-weight: 700;
  color: #fff; line-height: 1.3;
  margin-bottom: 12px;
}
.philosophy-card p { font-size: 0.9rem; color: rgba(255,255,255,0.45); line-height: 1.7; }

/* ── States preview ──────────────────────────────────────────── */
#states {
  background: var(--bg);
  padding: clamp(80px, 12vw, 160px) 0;
}
.states-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
  margin-top: 56px;
}
.state-card {
  padding: 40px;
  border-radius: var(--radius-xl);
  position: relative; overflow: hidden;
  cursor: default;
  transition: transform 0.4s var(--ease-out);
}
.state-card:hover { transform: scale(1.02); }
.state-card.locked  { background: #F0FDF4; border: 1px solid rgba(22,101,52,0.12); }
.state-card.scatter { background: #FFF7ED; border: 1px solid rgba(194,65,12,0.12); }
.state-card.flat    { background: #EFF6FF; border: 1px solid rgba(37,99,235,0.12); }
.state-card.over    { background: #FFFBEB; border: 1px solid rgba(180,83,9,0.12); }
.state-emoji { margin-bottom: 16px; position: relative; z-index: 1; }
.state-emoji img { width: 64px; height: 64px; object-fit: contain; display: block; }
.state-card h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem; font-weight: 700;
  margin-bottom: 8px;
  position: relative; z-index: 1;
}
.state-card p { font-size: 0.9rem; line-height: 1.65; position: relative; z-index: 1; }
.state-card.locked  h3, .state-card.locked  p { color: #166534; }
.state-card.scatter h3, .state-card.scatter p { color: #9A3412; }
.state-card.flat    h3, .state-card.flat    p { color: #1E40AF; }
.state-card.over    h3, .state-card.over    p { color: #92400E; }
.state-bg {
  position: absolute; right: -28px; bottom: -28px;
  opacity: 0.10;
  pointer-events: none; user-select: none;
}
.state-bg img { width: 200px; height: 200px; object-fit: contain; }

/* ── App preview ─────────────────────────────────────────────── */
#preview {
  background: var(--bg-warm);
  padding: clamp(80px, 12vw, 160px) 0;
  text-align: center;
}
.preview-phones {
  display: flex; align-items: flex-end; justify-content: center;
  gap: 16px; margin-top: 60px;
  perspective: 1000px;
}
.phone-mock {
  width: 220px;
  background: var(--ink);
  border-radius: 36px;
  padding: 12px;
  box-shadow: 0 40px 80px rgba(0,0,0,0.25), 0 0 0 1px rgba(255,255,255,0.08);
  transition: transform 0.4s var(--ease-out);
}
.phone-mock.left  { transform: rotate(-8deg) translateY(20px); }
.phone-mock.right { transform: rotate(8deg) translateY(20px); }
.phone-mock.center {
  transform: translateY(0);
  box-shadow: 0 60px 120px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.1);
}
.phone-mock:hover.left   { transform: rotate(-4deg) translateY(10px) scale(1.03); }
.phone-mock:hover.right  { transform: rotate(4deg) translateY(10px) scale(1.03); }
.phone-mock:hover.center { transform: translateY(-8px) scale(1.03); }
.phone-screen {
  border-radius: 28px;
  overflow: hidden;
  background: #FAF8F5;
  aspect-ratio: 9/19.5;
  display: flex; align-items: center; justify-content: center;
}
.phone-screen img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

/* ── Beta CTA ────────────────────────────────────────────────── */
#beta {
  background: var(--ink);
  padding: clamp(80px, 12vw, 160px) 0;
  text-align: center;
  overflow: hidden;
  position: relative;
  overscroll-behavior: contain;
}
.beta-glow {
  position: absolute; top: -120px; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,140,0,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.beta-headline { color: #fff; position: relative; z-index: 1; }
.beta-sub {
  font-size: 1.1rem; color: rgba(255,255,255,0.45);
  max-width: 480px; margin: 20px auto 44px;
  line-height: 1.7;
}
.email-form {
  display: flex; gap: 8px; max-width: 440px; margin: 0 auto;
  position: relative; z-index: 1;
}
.email-input {
  flex: 1;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  color: #fff;
  padding: 16px 20px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}
.email-input::placeholder { color: rgba(255,255,255,0.3); }
.email-input:focus { border-color: var(--orange); }
.email-submit {
  background: var(--orange);
  color: #fff;
  border: none; cursor: pointer;
  padding: 16px 28px;
  border-radius: 100px;
  font-size: 0.95rem; font-weight: 600;
  font-family: var(--font-sans);
  white-space: nowrap;
  transition: all 0.25s var(--ease-out);
}
.email-submit:hover { background: var(--amber); transform: scale(1.04); }
.email-note { font-size: 0.8rem; color: rgba(255,255,255,0.25); margin-top: 16px; position: relative; z-index:1; }

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background: var(--ink);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 40px clamp(20px, 5vw, 60px);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
}
footer .logo { font-family: var(--font-serif); color: rgba(255,255,255,0.5); font-size: 1rem; }
footer p { font-size: 0.8rem; color: rgba(255,255,255,0.2); }

/* ── Scroll reveal ───────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }
.reveal.delay-4 { transition-delay: 0.4s; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 768px) {
  .problem-grid   { grid-template-columns: 1fr; }
  .philosophy-grid { grid-template-columns: 1fr; }
  .states-grid    { grid-template-columns: 1fr; }
  .steps-row      { flex-direction: column; gap: 40px; }
  .steps-row::before { display: none; }
  .preview-phones { flex-direction: column; align-items: center; }
  .phone-mock.left, .phone-mock.right { transform: none; }
  .email-form { flex-direction: column; }
  footer { flex-direction: column; text-align: center; }
}