/* ============================================
   Excalihub landing — design tokens
   ============================================ */
:root {
  /* palette — canvas neutral + Excalihub purple + magenta accent */
  --bg: #fafaf7;
  --bg-elev: #ffffff;
  --surface: #f4f3ee;
  --fg: #1c1917;
  --fg-muted: #6b6760;
  --border: #e5e2da;
  --border-strong: #d4d0c6;

  --accent: #6965db; /* excalidraw purple */
  --accent-strong: #5551c4;
  --accent-soft: rgba(105, 101, 219, 0.1);
  --accent-soft-strong: rgba(105, 101, 219, 0.18);

  --accent-2: #ec4899; /* creative pink for scribble + AI */
  --accent-2-soft: rgba(236, 72, 153, 0.12);

  --success: #0891b2;
  --warning: #d97706;
  --destructive: #dc2626;

  /* typography */
  --font-sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-hand: "Caveat", "Segoe Script", cursive;

  /* spacing / radii */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --r-1: 6px;
  --r-2: 12px;
  --r-3: 20px;
  --r-pill: 999px;

  /* motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-pop: cubic-bezier(0.2, 1.4, 0.4, 1);
  --t-fast: 150ms;
  --t-med: 240ms;
  --t-slow: 400ms;

  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.06);
  --shadow-md: 0 4px 14px rgba(28, 25, 23, 0.08);
  --shadow-lg: 0 20px 50px rgba(28, 25, 23, 0.1);

  --maxw: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14120f;
    --bg-elev: #1c1917;
    --surface: #23201a;
    --fg: #f5f3ee;
    --fg-muted: #a8a296;
    --border: #332f28;
    --border-strong: #47423a;
    --accent-soft: rgba(105, 101, 219, 0.18);
    --accent-soft-strong: rgba(105, 101, 219, 0.28);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  }
}

/* ============================================
   Reset & base
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
}

p {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: var(--r-1);
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-1);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   Utilities
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

.btn--primary:hover {
  background: var(--accent);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--fg);
}

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

.btn--lg {
  padding: 14px 24px;
  font-size: 1rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: pulse 2s var(--ease) infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.4);
    opacity: 0.6;
  }
}

.section-head {
  max-width: 620px;
  margin-bottom: var(--s-8);
}

.section-head h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-top: var(--s-3);
  margin-bottom: var(--s-4);
}

.section-head p {
  color: var(--fg-muted);
  font-size: 1.1rem;
}

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

.link {
  font-weight: 600;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

/* ============================================
   Nav
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
  padding: var(--s-3) var(--s-6);
  max-width: var(--maxw);
  margin: 0 auto;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
}

.brand:hover {
  color: var(--accent);
}

.brand__name {
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: var(--s-5);
}

.nav__links a {
  color: var(--fg-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav__links a:hover {
  color: var(--fg);
}

.nav__cta {
  display: flex;
  gap: var(--s-2);
}

@media (max-width: 820px) {
  .nav__links {
    display: none;
  }
  .nav {
    padding: var(--s-3) var(--s-4);
  }
}

/* ============================================
   Hero
   ============================================ */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-8) var(--s-6) var(--s-9);
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: var(--s-8);
  align-items: center;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 520px;
  height: 520px;
  background: radial-gradient(
    circle,
    var(--accent-soft) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.hero__copy {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-size: clamp(2.6rem, 5.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: var(--s-4) 0;
}

.scribble {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: 1.25em;
  color: var(--accent-2);
  position: relative;
  display: inline-block;
}

.scribble::after {
  content: "";
  position: absolute;
  left: -4%;
  bottom: -6%;
  width: 110%;
  height: 30%;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 20' preserveAspectRatio='none'><path d='M2 14 Q 30 2, 60 12 T 120 10 T 198 8' fill='none' stroke='%23ec4899' stroke-width='3' stroke-linecap='round'/></svg>")
    no-repeat center / 100% 100%;
  z-index: -1;
}

.hero__lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  margin-bottom: var(--s-6);
  max-width: 52ch;
}

.hero__cta {
  display: flex;
  gap: var(--s-3);
  flex-wrap: wrap;
  margin-bottom: var(--s-6);
}

.hero__proof {
  display: flex;
  gap: var(--s-5);
  flex-wrap: wrap;
}

.hero__proof li {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
}

.hero__proof strong {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hero__proof span {
  color: var(--fg-muted);
}

/* ----- hero art ----- */
.hero__art {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  aspect-ratio: 4 / 3;
}

.frame {
  width: 100%;
  max-width: 480px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: perspective(1200px) rotateY(-6deg) rotateX(3deg);
  transition: transform var(--t-slow) var(--ease);
}

.hero__art:hover .frame {
  transform: perspective(1200px) rotateY(-2deg) rotateX(1deg);
}

.frame__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.dot--r {
  background: #ff5f57;
}
.dot--y {
  background: #febc2e;
}
.dot--g {
  background: #28c840;
}

.frame__url {
  margin-left: 8px;
  font-size: 0.8rem;
  color: var(--fg-muted);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 2px 12px;
  border-radius: var(--r-pill);
}

.frame__body {
  position: relative;
  aspect-ratio: 3 / 2;
  background: var(--bg-elev);
  overflow: hidden;
}

.grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sketch {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sketch__shape text {
  font-family: var(--font-hand);
  font-size: 14px;
  fill: var(--fg);
}

.sketch__shape rect {
  fill: var(--accent-soft);
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-dasharray: 4 0;
  transition: fill var(--t-med) var(--ease);
}

.sketch__shape:hover rect {
  fill: var(--accent-soft-strong);
}

.arrow {
  stroke: var(--fg-muted);
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
}

.arrow--back {
  stroke: var(--accent-2);
}

/* animated sketch shapes */
.sketch__shape {
  transform-origin: center;
}

.sketch__shape--1 {
  animation: float1 6s var(--ease) infinite;
}
.sketch__shape--2 {
  animation: float2 7s var(--ease) infinite;
}
.sketch__shape--3 {
  animation: float3 8s var(--ease) infinite;
}

@keyframes float1 {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(3px, -4px);
  }
}
@keyframes float2 {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(-3px, 5px);
  }
}
@keyframes float3 {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(4px, 3px);
  }
}

/* sidebar overlay */
.sidebar {
  position: absolute;
  top: 8px;
  right: 8px;
  bottom: 8px;
  width: 160px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-2);
  box-shadow: var(--shadow-md);
  padding: var(--s-3);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  font-size: 0.8rem;
  animation: slideIn 8s var(--ease) infinite;
}

@keyframes slideIn {
  0%,
  40% {
    transform: translateX(0%);
    opacity: 1;
  }
  50%,
  60% {
    transform: translateX(0%);
    opacity: 1;
  }
  90%,
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
}

.sidebar__count {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--r-pill);
}

.sidebar__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar__list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--r-1);
  color: var(--fg-muted);
  cursor: pointer;
  transition: background var(--t-fast) var(--ease);
}

.sidebar__list li:hover {
  background: var(--surface);
  color: var(--fg);
}

.sidebar__list li.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.file {
  width: 12px;
  height: 14px;
  border-radius: 2px;
  border: 1.5px solid currentColor;
  flex-shrink: 0;
  position: relative;
}

.file--diagram::after {
  content: "";
  position: absolute;
  inset: 2px 3px 3px 3px;
  border: 1px solid currentColor;
  border-top: none;
  border-right: none;
}

.file--slides::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px solid currentColor;
}

.file--ai {
  background: var(--accent-2-soft);
  border-color: var(--accent-2);
}

.sidebar__prompt {
  margin-top: auto;
  padding: var(--s-2);
  background: var(--accent-soft);
  border: 1px dashed var(--accent);
  border-radius: var(--r-1);
}

.sidebar__prompt-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sidebar__prompt p {
  font-family: var(--font-hand);
  font-size: 0.95rem;
  margin-top: 4px;
  color: var(--fg);
}

/* floating pencil */
.pencil {
  position: absolute;
  bottom: -14px;
  left: -14px;
  width: 56px;
  height: 56px;
  color: var(--accent);
  animation: floatPencil 5s var(--ease) infinite;
  filter: drop-shadow(0 8px 14px rgba(105, 101, 219, 0.3));
}

@keyframes floatPencil {
  0%,
  100% {
    transform: translate(0, 0) rotate(-12deg);
  }
  50% {
    transform: translate(8px, -8px) rotate(-18deg);
  }
}

/* callouts */
.callout {
  position: absolute;
  font-family: var(--font-hand);
  font-size: 1.2rem;
  color: var(--fg);
  white-space: nowrap;
  pointer-events: none;
}

.callout::before {
  content: "";
  position: absolute;
  width: 40px;
  height: 1px;
  background: var(--fg-muted);
  opacity: 0.4;
}

.callout--save {
  top: 18%;
  left: -8%;
}
.callout--save::before {
  right: -48px;
  top: 50%;
  transform: rotate(-8deg);
}

.callout--present {
  top: 42%;
  right: -10%;
}
.callout--present::before {
  left: -48px;
  top: 50%;
  transform: rotate(8deg);
}

.callout--ai {
  bottom: 14%;
  left: 4%;
}
.callout--ai::before {
  right: -44px;
  top: 60%;
}

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--s-6);
    padding: var(--s-6) var(--s-4) var(--s-8);
  }
  .hero__art {
    order: -1;
    max-width: 380px;
    margin: 0 auto;
  }
  .frame {
    transform: none;
  }
  .hero__art:hover .frame {
    transform: none;
  }
  .callout {
    display: none;
  }
  .hero__title {
    font-size: clamp(2rem, 8vw, 2.8rem);
  }
}

/* ============================================
   Strip
   ============================================ */
.strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: var(--s-5) var(--s-6);
  max-width: var(--maxw);
  margin: 0 auto;
}

.strip__label {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 0 0 var(--s-4);
}

.strip__logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--s-7);
  flex-wrap: wrap;
  opacity: 0.65;
}

.logo {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
  color: var(--fg);
  position: relative;
}

.logo::before {
  content: "◆";
  font-size: 0.6em;
  margin-right: 8px;
  vertical-align: middle;
  color: var(--accent);
}

/* ============================================
   Features
   ============================================ */
.features {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-9) var(--s-6);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}

.feature {
  padding: var(--s-5);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  background: var(--bg-elev);
  transition: transform var(--t-med) var(--ease),
    border-color var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}

.feature:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.feature__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--r-2);
  display: grid;
  place-items: center;
  margin-bottom: var(--s-4);
}

.feature__icon svg {
  width: 22px;
  height: 22px;
}

.feature__icon--save {
  background: var(--accent-soft);
  color: var(--accent);
}
.feature__icon--present {
  background: var(--accent-2-soft);
  color: var(--accent-2);
}
.feature__icon--ai {
  background: var(--accent-soft-strong);
  color: var(--accent-strong);
}
.feature__icon--share {
  background: var(--accent-soft);
  color: var(--accent);
}
.feature__icon--theme {
  background: var(--accent-soft);
  color: var(--accent);
}
.feature__icon--byok {
  background: var(--accent-soft-strong);
  color: var(--accent-strong);
}

.feature h3 {
  font-size: 1.1rem;
  margin-bottom: var(--s-2);
}

.feature p {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

@media (max-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   How it works
   ============================================ */
.how {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-9) var(--s-6);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
  position: relative;
}

.steps::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--accent),
    var(--accent-2)
  );
  opacity: 0.25;
  z-index: 0;
}

.step {
  position: relative;
  z-index: 1;
  padding: 0 var(--s-2);
}

.step__num {
  font-family: var(--font-hand);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--s-3);
  display: inline-block;
  background: var(--bg);
  padding: 0 4px;
}

.step h3 {
  font-size: 1.1rem;
  margin-bottom: var(--s-2);
}

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

@media (max-width: 820px) {
  .steps {
    grid-template-columns: 1fr;
    gap: var(--s-4);
  }
  .steps::before {
    display: none;
  }
}

/* ============================================
   Privacy
   ============================================ */
.privacy {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-9) var(--s-6);
}

.privacy__card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s-5);
  align-items: start;
  padding: var(--s-6);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  box-shadow: var(--shadow-sm);
}

.privacy__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-2);
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.privacy__icon svg {
  width: 26px;
  height: 26px;
}

.privacy h2 {
  font-size: 1.5rem;
  margin-bottom: var(--s-2);
}

.privacy p {
  color: var(--fg-muted);
  font-size: 1rem;
}

.privacy .link {
  margin-top: var(--s-3);
}

@media (max-width: 620px) {
  .privacy__card {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   CTA
   ============================================ */
.cta {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-9) var(--s-6);
  text-align: center;
}

.cta h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: var(--s-3);
}

.cta p {
  color: var(--fg-muted);
  font-size: 1.1rem;
  margin-bottom: var(--s-5);
}

.cta .btn {
  margin: 0 auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-6) var(--s-6) var(--s-7);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s-4);
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.footer__links {
  display: flex;
  gap: var(--s-5);
}

.footer__links a {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.footer__links a:hover {
  color: var(--fg);
}

.footer__note {
  color: var(--fg-muted);
  font-size: 0.85rem;
}

@media (max-width: 620px) {
  .footer {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================
   Scroll-reveal on load
   ============================================ */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--t-slow) var(--ease),
    transform var(--t-slow) var(--ease);
}

.js [data-reveal="in"] {
  opacity: 1;
  transform: none;
}

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