/* ─── Reset & Base ─────────────────────────────────────── */
:root {
  --bg:      #0a0a0f;
  --surface: #13131c;
  --card:    #1a1a28;
  --border:  rgba(255,255,255,0.07);
  --ink:     #f0f0f5;
  --muted:   #8b8ba0;
  --accent:  #6366f1;
  --accent2: #818cf8;
  --green:   #22c55e;
  --amber:   #eab308;
  --blue:    #3b82f6;
  --radius:  16px;
  --maxw:    1200px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
html, body {
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

body {
  font-family: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(99,102,241,0.15);
  color: var(--accent2);
  padding: 0.15em 0.5em;
  border-radius: 6px;
  font-size: 0.9em;
}

/* Film-grain overlay */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px;
}

/* ─── Nav ──────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 16px auto 0;
  padding: 12px 24px;
  background: rgba(10,10,15,0.7);
  backdrop-filter: blur(20px) saturate(1.4);
  border: 1px solid var(--border);
  border-radius: 999px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

img.nav-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

.nav-title {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  transition: color 150ms;
}
.nav-links a:hover { color: #fff; }

.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem !important;
  transition: background 150ms, transform 150ms;
}
.nav-cta:hover {
  background: var(--accent2) !important;
  transform: translateY(-1px);
}

/* ─── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
  text-decoration: none;
}
.btn:hover { transform: translateY(-2px); }

.btn-xl {
  padding: 18px 36px;
  font-size: 1.1rem;
}

.btn-download {
  justify-content: center;
  align-items: center;
  gap: 14px;
}

.btn-download-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-width: 0;
}

.btn-download-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  line-height: 1.05;
}

.download-count {
  display: block;
  margin-top: 4px;
  color: rgba(255,255,255,0.72);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: #fff;
  box-shadow: 0 12px 40px rgba(99,102,241,0.35);
}
.btn-primary:hover {
  box-shadow: 0 18px 50px rgba(99,102,241,0.45);
}

.btn-ghost {
  background: rgba(255,255,255,0.06);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.12);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
}

/* ─── HERO ─────────────────────────────────────────────── */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 130px 24px 60px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}

.hero-glow-1 {
  top: -10%;
  left: -20%;
  width: 700px;
  height: 700px;
  background: rgba(99,102,241,0.14);
}

.hero-glow-2 {
  bottom: -15%;
  right: -15%;
  width: 600px;
  height: 600px;
  background: rgba(124,58,237,0.1);
}

.hero-content {
  position: relative;
  z-index: 10;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.2);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent2);
  margin-bottom: 28px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px rgba(34,197,94,0.5);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2.8rem, 5.5vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero h1 .accent { color: var(--accent2); }

.hero-sub {
  margin-top: 24px;
  font-size: 1.12rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 48ch;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 36px;
}

.hero-note {
  grid-column: 1 / -1;
  margin-top: 0;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(99,102,241,0.16);
  background: rgba(99,102,241,0.08);
  color: #d8d9ea;
  font-size: 0.95rem;
  line-height: 1.7;
}

.hero-note strong {
  color: #fff;
}

/* ─── App mockup ───────────────────────────────────────── */
.hero-mockup {
  position: relative;
  z-index: 2;
  align-self: center;
}

.mockup-window {
  background: linear-gradient(180deg, #14142a, #0e0e1e);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  overflow: hidden;
  box-shadow:
    0 40px 80px rgba(0,0,0,0.5),
    0 0 0 1px rgba(99,102,241,0.08);
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0 0 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  height: 40px;
}

.mockup-titlebar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
}

img.mockup-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  object-fit: cover;
}

.mockup-controls {
  display: flex;
  height: 100%;
}

.ctrl {
  display: grid;
  place-items: center;
  width: 46px;
  height: 100%;
  position: relative;
}

.ctrl::after {
  content: '';
  display: block;
}

.ctrl-min::after {
  width: 10px;
  border-bottom: 1.5px solid rgba(255,255,255,0.5);
}

.ctrl-max::after {
  width: 9px;
  height: 9px;
  border: 1.5px solid rgba(255,255,255,0.5);
}

.ctrl-close {
  background: transparent;
  transition: background 120ms;
}
.ctrl-close:hover { background: #e81123; }
.ctrl-close::after {
  content: '\00D7';
  border: none;
  width: auto;
  height: auto;
  color: rgba(255,255,255,0.7);
  font-size: 1.3rem;
  font-weight: 300;
}

.mockup-body {
  padding: 20px;
}

.mockup-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.m-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.m-chip em {
  font-style: normal;
  opacity: 0.6;
}

.m-chip b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 8px;
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
}

.m-blue { background: rgba(59,130,246,0.15); color: #93bbfd; }
.m-blue b { background: var(--blue); color: #fff; }
.m-green { background: rgba(34,197,94,0.15); color: #86efac; }
.m-green b { background: var(--green); color: #fff; }
.m-amber { background: rgba(234,179,8,0.15); color: #fde68a; }
.m-amber b { background: var(--amber); color: #000; }

.mockup-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  margin-bottom: 8px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.03);
}

.mc-bar {
  width: 4px;
  height: 34px;
  border-radius: 4px;
  flex-shrink: 0;
}

.mc-green { background: var(--green); }
.mc-blue { background: var(--blue); }

.mc-text {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mc-ep {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.9rem;
}

.mc-status {
  color: var(--muted);
  font-size: 0.85rem;
}

.status-fix { color: var(--accent2); }

.mockup-progress {
  margin-top: 14px;
}

.mp-track {
  height: 4px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}

@keyframes progress-pulse {
  0%   { width: 0%; }
  80%  { width: 100%; }
  90%  { width: 100%; opacity: 1; }
  95%  { opacity: 0; width: 100%; }
  96%  { width: 0%; opacity: 0; }
  100% { width: 0%; opacity: 1; }
}

.mp-fill {
  width: 0%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  animation: progress-pulse 4s ease-in-out infinite;
}

.mp-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

/* Floating subtitle snippets */
.float-sub {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 16px;
  border-radius: 10px;
  background: rgba(20,20,35,0.9);
  border: 1px solid rgba(99,102,241,0.18);
  backdrop-filter: blur(12px);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  animation: float-y 6s ease-in-out infinite;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.float-sub-1 {
  top: 40px;
  right: -90px;
  animation-delay: -1s;
}

.float-sub-2 {
  bottom: -40px;
  left: -40px;
  animation-delay: -3s;
}

.float-sub-3 {
  bottom: 50px;
  right: -110px;
  animation-delay: -4.5s;
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.sub-time {
  color: var(--muted);
}

.sub-text {
  color: var(--accent2);
  font-weight: 500;
}

.sub-text strong { color: var(--green); }

/* ─── Section labels ──────────────────────────────────── */
.section-label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.15);
  color: var(--accent2);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}

/* ─── FEATURES ─────────────────────────────────────────── */
.features {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 24px;
}

.features h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 36px;
  max-width: 20ch;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feat {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  transition: border-color 200ms, transform 200ms;
}

.feat:hover {
  border-color: rgba(99,102,241,0.2);
  transform: translateY(-2px);
}

.feat-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(99,102,241,0.1);
  color: var(--accent2);
  margin-bottom: 18px;
}

.feat h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feat p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ─── ALGORITHM SHOWCASE ───────────────────────────────── */
.algorithm {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 80px 24px;
}

.algorithm h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  max-width: 28ch;
}

.algo-sub {
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 36px;
  max-width: 55ch;
}

.algo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.algo-card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  transition: border-color 200ms, transform 200ms;
}

.algo-card:hover {
  border-color: rgba(99,102,241,0.2);
  transform: translateY(-2px);
}

.algo-card-hero {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 48px 32px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.12), transparent 60%),
    var(--card);
  border-color: rgba(99,102,241,0.15);
}

.algo-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}

.algo-card-hero h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.algo-card-hero p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
  max-width: 50ch;
}

.algo-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(99,102,241,0.1);
  color: var(--accent2);
  margin-bottom: 16px;
}

.algo-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.algo-card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ─── HOW ──────────────────────────────────────────────── */
.how {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.how h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 36px;
}

.steps {
  display: flex;
  align-items: center;
  gap: 24px;
}

.step {
  flex: 1;
  padding: 32px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  position: relative;
}

.step-n {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 18px;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.step-arrow {
  font-size: 1.6rem;
  color: rgba(255,255,255,0.15);
  flex-shrink: 0;
}

/* ─── CTA Bottom ───────────────────────────────────────── */
.cta-bottom {
  padding: 0 24px 60px;
}

.cta-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  text-align: center;
  padding: 64px 40px;
  border-radius: 24px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.15), transparent 60%),
    var(--card);
  border: 1px solid rgba(99,102,241,0.12);
}

.cta-inner h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.cta-inner p {
  color: var(--muted);
  font-size: 1.1rem;
  margin-top: 12px;
  margin-bottom: 32px;
}

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

/* ─── Footer ───────────────────────────────────────────── */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.footer-legal {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--muted);
}

.footer-legal a {
  color: var(--muted);
  transition: color 150ms;
}

.footer-legal a:hover {
  color: #fff;
}

.footer-legal .sep {
  opacity: 0.3;
}

/* ─── Responsive ───────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 120px;
    min-height: auto;
    gap: 40px;
  }

  .hero-mockup {
    max-width: 520px;
    margin: 0 auto;
    margin-top: 0;
  }

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

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

  .algo-card-hero {
    grid-column: 1 / -1;
  }

  .float-sub { display: none; }
}

@media (max-width: 720px) {
  .nav-links a:not(.nav-cta) { display: none; }

  .nav {
    width: calc(100% - 32px);
    padding: 10px 16px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .algo-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    flex-direction: column;
  }

  .step-arrow {
    transform: rotate(90deg);
    font-size: 1.2rem;
  }

  .hero-actions, .cta-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

    .btn-xl {
      width: 100%;
      justify-content: center;
    }

    .btn-support {
      width: 100%;
      min-height: 56px;
      justify-content: center;
    }

    .btn-download-copy {
      align-items: center;
    }

    .donate-container {
      width: 100%;
      display: block;
    }

  .donate-menu {
    position: relative;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    transform: none !important;
    width: 100% !important;
    max-width: 100%;
    flex-direction: column;
    display: none;
    opacity: 1;
    pointer-events: auto;
    margin-top: 10px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  }

  .donate-container.active .donate-menu {
    display: flex;
    transform: none !important;
  }

  .donate-item {
    justify-content: flex-start;
    padding: 16px;
    border: 1px solid rgba(255,255,255,0.05);
    width: 100%;
    white-space: normal;
  }

  .cta-inner {
    padding: 40px 24px;
  }
}

@media (max-width: 560px) {
  .mockup-chips {
    flex-wrap: nowrap;
    gap: 6px;
  }

  .m-chip {
    flex: 1 1 0;
    justify-content: center;
    min-width: 0;
    gap: 4px;
    padding: 5px 8px;
    font-size: 0.64rem;
    white-space: nowrap;
  }

  .m-chip b {
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 7px;
    font-size: 0.72rem;
  }
}

/* ─── Donate Dropdown ─────────────────────────────────── */
.donate-container {
  position: relative;
  display: inline-flex;
  align-self: center;
  vertical-align: middle;
}

.btn-support {
  justify-content: center;
  min-height: 60px;
  padding: 14px 26px;
  font-size: 1rem;
  border-radius: 18px;
}

.donate-menu {
  position: absolute;
  top: 50%;
  left: calc(100% + 12px);
  transform: translateY(-40%) translateX(10px);
  width: max-content;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 6px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: row;
  gap: 6px;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms, transform 200ms;
}

.donate-container.active .donate-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%) translateX(0);
}

.donate-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  transition: background 150ms;
  font-size: 0.88rem;
  color: var(--muted);
}

.donate-item:hover {
  background: rgba(255,255,255,0.05);
  color: #fff;
}

.donate-item-title {
  display: block;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.donate-item-desc {
  font-size: 0.8rem;
}

.donate-item .icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,0.08);
  flex-shrink: 0;
}