/* 딱투두 site. Tokens come from DESIGN.md. */
:root {
  --brand: #4f5bd5;
  --brand-strong: #3f4bc0;
  --brand-tint: #e9ebfa;
  --bg: #f0f0f5;
  --surface: #ffffff;
  --ink: #111111;
  --ink-2: #505050;
  --ink-3: #767676;
  --line: #e5e5ec;

  --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-sm: 8px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-pill: 9999px;

  --fs-display: clamp(2.25rem, 1.55rem + 3.2vw, 3.5rem);
  --fs-h2: clamp(1.625rem, 1.3rem + 1.4vw, 2.25rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-caption: 0.8125rem;

  --gutter: 20px;
  --max: 1120px;
  --font: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.7;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--brand-strong); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: var(--r-sm); }

.skip {
  position: absolute; left: var(--s-4); top: -64px; z-index: 10;
  background: var(--ink); color: #fff; padding: var(--s-3) var(--s-4); border-radius: var(--r-sm);
  min-height: 44px; display: inline-flex; align-items: center;
}
.skip:focus { top: var(--s-3); color: #fff; }

.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }

/* header */
.site-header { padding-block: var(--s-2); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.brand {
  display: inline-flex; align-items: center; gap: var(--s-2);
  min-height: 44px; color: var(--ink); text-decoration: none;
  font-weight: 700; font-size: 1.125rem; letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); }
.brand img { width: 28px; height: 28px; flex: none; border-radius: 7px; }
.nav { display: flex; align-items: center; }
.nav a {
  display: inline-flex; align-items: center; min-height: 44px; padding-inline: var(--s-3);
  color: var(--ink-2); text-decoration: none; font-size: var(--fs-small); font-weight: 500;
  border-radius: var(--r-sm); transition: color 150ms ease-out;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); }

/* type */
.eyebrow {
  display: inline-block; color: var(--brand); font-size: var(--fs-caption); font-weight: 700;
  letter-spacing: 0.02em;
}
.display { font-size: var(--fs-display); line-height: 1.25; font-weight: 700; letter-spacing: -0.02em; text-wrap: balance; }
.h1 { font-size: clamp(1.875rem, 1.5rem + 1.6vw, 2.5rem); line-height: 1.3; font-weight: 700; letter-spacing: -0.02em; text-wrap: balance; }
.h2 { font-size: var(--fs-h2); line-height: 1.35; font-weight: 700; letter-spacing: -0.02em; text-wrap: balance; }
.h3 { font-size: var(--fs-h3); line-height: 1.4; font-weight: 700; letter-spacing: -0.01em; text-wrap: balance; }
.lead { color: var(--ink-2); font-size: 1.0625rem; line-height: 1.75; }
.muted { color: var(--ink-2); }
.small { font-size: var(--fs-small); }

/* primitives */
.tag {
  display: inline-flex; align-items: center; min-height: 28px; padding: 2px var(--s-3);
  background: var(--brand-tint); color: var(--brand-strong); border-radius: var(--r-pill);
  font-size: var(--fs-caption); font-weight: 700;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: 0 var(--s-5); border-radius: var(--r-md); border: 1px solid transparent;
  background: var(--brand); color: #fff; font: inherit; font-weight: 700; text-decoration: none;
  transition: background-color 150ms ease-out, transform 150ms ease-out;
}
.btn:hover { background: var(--brand-strong); color: #fff; }
.btn:active { transform: scale(0.98); }
.btn--ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { background: var(--surface); color: var(--brand); }
.status {
  display: inline-flex; align-items: center; gap: var(--s-2); min-height: 48px;
  padding: 0 var(--s-5); background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-md); color: var(--ink); font-weight: 700;
}
.status::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--brand); flex: none;
}
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: var(--s-5);
}

.device {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-xl);
  padding: var(--s-2); box-shadow: 0 20px 40px -24px rgb(17 17 17 / 0.12);
}
.device img { border-radius: calc(var(--r-xl) - var(--s-2)); width: 100%; }
.shot { display: grid; gap: var(--s-3); justify-items: center; }
.shot figcaption { color: var(--ink-2); font-size: var(--fs-caption); font-weight: 500; text-align: center; }

/* hero */
.hero { padding-block: var(--s-7) var(--s-8); }
.hero-grid { display: grid; gap: var(--s-7); align-items: center; }
.hero-copy { display: grid; gap: var(--s-5); justify-items: start; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.hero-note { color: var(--ink-2); font-size: var(--fs-small); }
.hero-media { position: relative; display: grid; justify-items: center; padding: var(--s-5) var(--s-4); }
.hero-media::before {
  content: ""; position: absolute; inset: 0 var(--s-4); background: var(--brand-tint);
  border-radius: var(--r-xl) var(--r-xl) var(--r-xl) var(--r-xl);
}
.hero-media .device { position: relative; width: min(280px, 72vw); }

/* sections */
.section { padding-block: var(--s-7); }
.section-head { display: grid; gap: var(--s-3); max-width: 640px; margin-bottom: var(--s-6); }
.principles { display: grid; gap: var(--s-4); }
.principle { display: grid; gap: var(--s-2); }
.principle h3 { font-size: 1.0625rem; font-weight: 700; }
.principle p { color: var(--ink-2); font-size: var(--fs-small); }
.quote { display: grid; gap: var(--s-2); align-content: center; }
.quote p { font-size: 1.25rem; line-height: 1.6; font-weight: 700; letter-spacing: -0.01em; text-wrap: balance; }
.quote span { color: var(--ink-2); font-size: var(--fs-small); }
.intro-grid { display: grid; gap: var(--s-5); }
.intro-grid .section-head { margin-bottom: 0; }
.intro-grid + .points { margin-top: var(--s-6); }
.faq-title { margin-bottom: var(--s-4); }

.features { display: grid; gap: var(--s-5); }
.feature { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-6); padding: var(--s-5); align-items: center; }
.feature > * { min-width: 0; }
.feature-copy { display: grid; gap: var(--s-3); justify-items: start; align-content: center; }
.feature-copy p { color: var(--ink-2); }
.feature-media { display: grid; justify-items: center; }
.feature-media .device { width: min(260px, 70vw); }
.panel {
  background: var(--brand-tint); border-radius: var(--r-lg); padding: var(--s-5);
  display: grid; gap: var(--s-4); justify-items: center; width: 100%;
}
.panel img { border-radius: var(--r-lg); }
.panel .wide { width: min(100%, 440px); }
.panel .small-widget { width: min(100%, 240px); }
.feature-media .duo .device { width: 100%; }
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-4); align-items: start; width: 100%; max-width: 460px; }
.points { display: grid; gap: var(--s-4); margin-top: var(--s-2); width: 100%; }
.point { display: grid; align-content: start; gap: var(--s-1); padding-top: var(--s-3); border-top: 1px solid var(--line); }
.point strong { font-size: 1.0625rem; }
.point span { color: var(--ink-2); font-size: var(--fs-small); }
.check-row { display: flex; flex-wrap: wrap; gap: var(--s-2); }

.gallery {
  display: grid; grid-auto-flow: column; grid-auto-columns: min(220px, 62vw); gap: var(--s-4);
  overflow-x: auto; scroll-snap-type: x mandatory; padding: var(--s-2) var(--s-2) var(--s-4);
  margin-inline: calc(var(--s-2) * -1);
}
.gallery > * { scroll-snap-align: start; }
.gallery:focus-visible { outline-offset: 4px; }

/* plans */
.plans { display: grid; gap: var(--s-5); }
.plan { display: grid; gap: var(--s-4); align-content: start; padding: var(--s-6) var(--s-5); }
.plan--premium { background: var(--brand-tint); border-color: transparent; }
.plan--premium .tag { background: var(--surface); }
.plan-head { display: grid; gap: var(--s-2); justify-items: start; }
.plan h3 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.plan-sub { color: var(--ink-2); }
.checks { display: grid; gap: var(--s-3); }
.checks li { position: relative; padding-left: 32px; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: 4px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--brand) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-6.5' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px 20px no-repeat;
}
.checks .is-dim { color: var(--ink-2); }
.checks .is-dim::before {
  background-color: var(--ink-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10h8' fill='none' stroke='white' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
}
.plan-foot { color: var(--ink-2); font-size: var(--fs-small); padding-top: var(--s-3); border-top: 1px solid var(--line); }
.plan--premium .plan-foot { border-top-color: rgb(79 91 213 / 0.25); }

/* download */
.download { display: grid; gap: var(--s-5); justify-items: start; padding: var(--s-6) var(--s-5); }
.download p { color: var(--ink-2); max-width: 560px; }

/* faq */
.faq { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding-inline: var(--s-5); }
.faq details { border-bottom: 1px solid var(--line); }
.faq details:last-child { border-bottom: 0; }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-4);
  min-height: 56px; padding-block: var(--s-3); cursor: pointer; list-style: none; font-weight: 700;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; flex: none; width: 20px; height: 20px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 8l5 5 5-5' fill='none' stroke='%23505050' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px 20px no-repeat;
  transition: transform 200ms ease-out;
}
.faq details[open] summary::after { transform: rotate(180deg); }
.faq summary:hover { color: var(--brand); }
.faq .answer { padding-bottom: var(--s-5); color: var(--ink-2); display: grid; gap: var(--s-3); }
.faq .answer ol { list-style: decimal; padding-left: var(--s-5); display: grid; gap: var(--s-2); }
.faq .answer ul { list-style: disc; padding-left: var(--s-5); display: grid; gap: var(--s-2); }
.faq .answer strong { color: var(--ink); }

/* contact + doc pages */
.page { padding-block: var(--s-6) var(--s-8); }
.page-narrow { max-width: 760px; }
.page-head { display: grid; gap: var(--s-3); margin-bottom: var(--s-6); }
.meta { color: var(--ink-2); font-size: var(--fs-small); }
.doc { display: grid; gap: var(--s-6); padding: var(--s-5); }
.doc section { display: grid; gap: var(--s-3); }
.doc h2 { font-size: 1.25rem; line-height: 1.4; font-weight: 700; letter-spacing: -0.01em; }
.doc p, .doc li { color: var(--ink-2); }
.doc strong { color: var(--ink); }
.doc ul { list-style: disc; padding-left: var(--s-5); display: grid; gap: var(--s-2); }
.doc .summary { background: var(--bg); border-radius: var(--r-md); padding: var(--s-4) var(--s-5); }
.doc .summary p { color: var(--ink); }
.contact { display: grid; gap: var(--s-3); justify-items: start; margin-bottom: var(--s-6); }
.contact a.mail { display: inline-flex; align-items: center; min-height: 44px; font-size: 1.25rem; font-weight: 700; word-break: break-all; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding-block: var(--s-6) var(--s-7); color: var(--ink-2); font-size: var(--fs-small); }
.footer-grid { display: grid; gap: var(--s-5); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--s-1) var(--s-2); margin-left: calc(var(--s-3) * -1); }
.footer-links a { display: inline-flex; align-items: center; min-height: 44px; padding-inline: var(--s-3); color: var(--ink-2); text-decoration: none; font-weight: 500; }
.footer-links a:hover { color: var(--brand); }
.footer-meta { display: grid; gap: var(--s-1); }
.footer-meta a { display: inline-flex; align-items: center; min-height: 44px; }

@media (min-width: 720px) {
  :root { --gutter: 32px; }
  .nav a { padding-inline: var(--s-4); }
  .principles { grid-template-columns: repeat(3, 1fr); }
  .intro-grid { grid-template-columns: 1.1fr 1fr; align-items: stretch; }
  .points { grid-template-columns: repeat(3, 1fr); gap: var(--s-5); }
  .plans { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr auto; align-items: start; }
  .doc { padding: var(--s-7); }
  .card { padding: var(--s-6); }
  .gallery { grid-auto-columns: 1fr; grid-template-columns: repeat(5, minmax(0, 1fr)); overflow: visible; }
  .download { padding: var(--s-7); }
}

@media (min-width: 960px) {
  .hero { padding-block: var(--s-8); }
  .hero-grid { grid-template-columns: 1.1fr 0.9fr; gap: var(--s-8); }
  .section { padding-block: var(--s-8); }
  .feature { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: var(--s-7); gap: var(--s-8); }
  .feature--flip .feature-media { order: -1; }
  .feature--wide { grid-template-columns: minmax(0, 1fr); }
  .feature-media .device { width: 280px; }
  .hero-media .device { width: 300px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}