/* Tideline site — shared styles for index.html and privacy.html.
   Apple product-page layout on the Tideline brand palette (Brand/README.md):
   Deep Current #0B2633, Tidal Cyan #159CB5, Foam #EAF7F5, Midnight #071C27,
   Sea Glass #8AE8D6, Bright Current #48BFD2. Light by default, dark follows
   the system. */

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --bg-alt: #f5f7f7;
  --surface: #ffffff;
  --surface-2: #f2f4f5;
  --text: #1d1d1f;
  --ink: #0b2633;
  --muted: #5f6b70;
  --line: #d9dfe1;
  --accent: #159cb5;
  --accent-text: #0b7285;
  --link: #0b7285;
  --ok: #1d7a46;
  --ok-bg: #e3f4ea;
  --warn: #9a5b00;
  --warn-bg: #fdf0dc;
  --neutral-bg: #e9edef;
  --pill-bg: #0b2633;
  --pill-text: #eaf7f5;
  --nav-bg: rgba(255, 255, 255, 0.78);
  --shadow: 0 30px 80px -30px rgba(11, 38, 51, 0.35), 0 12px 30px -18px rgba(11, 38, 51, 0.25);
  --field-a: #0b2633;
  --field-b: #159cb5;
  --icon-ground: #eaf7f5;

  --dark-bg: #071c27;
  --dark-surface: #0d2b39;
  --dark-text: #eaf7f5;
  --dark-muted: #9bb8c2;
  --dark-line: #1d4152;
  --dark-accent: #48bfd2;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter Tight", "Inter",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 980px;
  --gutter: 22px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #071c27;
    --bg-alt: #0a2330;
    --surface: #0d2b39;
    --surface-2: #10303f;
    --text: #eaf7f5;
    --ink: #eaf7f5;
    --muted: #9bb8c2;
    --line: #1d4152;
    --accent: #48bfd2;
    --accent-text: #48bfd2;
    --link: #8ae8d6;
    --ok: #7fe0a6;
    --ok-bg: rgba(74, 222, 128, 0.12);
    --warn: #f3c06b;
    --warn-bg: rgba(240, 179, 74, 0.14);
    --neutral-bg: rgba(155, 184, 194, 0.14);
    --pill-bg: #eaf7f5;
    --pill-text: #071c27;
    --nav-bg: rgba(7, 28, 39, 0.78);
    --shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.7), 0 12px 30px -18px rgba(0, 0, 0, 0.6);
    --field-a: #8ae8d6;
    --field-b: #48bfd2;
    --icon-ground: #071c27;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -0.012em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border-radius: 5px;
  padding: 0.08em 0.35em;
  overflow-wrap: anywhere;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--pill-bg);
  color: var(--pill-text);
  padding: 8px 14px;
  border-radius: 999px;
  z-index: 100;
}

.skip:focus {
  left: 12px;
}

.wrap {
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
}

.wrap-wide {
  width: min(100% - 2 * var(--gutter), 1180px);
  margin-inline: auto;
}

/* ---------- Mark & app icon ---------- */

.mark .a {
  fill: var(--field-a);
}

.mark .b {
  fill: var(--field-b);
}

.app-icon {
  display: block;
  border-radius: 22.5%;
  box-shadow: 0 1px 2px rgba(11, 38, 51, 0.12), 0 14px 34px -14px rgba(11, 38, 51, 0.45);
}

.app-icon .ground {
  fill: var(--icon-ground);
}

/* ---------- Navigation ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 52px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-family: var(--display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 13px;
  letter-spacing: -0.005em;
}

.nav-links a {
  color: var(--muted);
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-links .nav-pill,
.nav-links .nav-pill:hover {
  color: var(--pill-text);
  background: var(--pill-bg);
  padding: 7px 16px;
  border-radius: 999px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-links .nav-pill:hover {
  opacity: 0.85;
}

@media (max-width: 760px) {
  .nav-links a:not(.nav-pill) {
    display: none;
  }
}

/* ---------- Type ---------- */

.eyebrow {
  display: block;
  font-family: var(--display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--accent-text);
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  font-family: var(--display);
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(42px, 7.4vw, 80px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.035em;
}

h3 {
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.lede {
  font-family: var(--display);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.38;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--muted);
  margin: 20px 0 0;
  text-wrap: pretty;
}

.lede strong {
  color: var(--ink);
  font-weight: 600;
}

.center {
  text-align: center;
}

.center .lede {
  margin-inline: auto;
  max-width: 34em;
}

/* ---------- Hero ---------- */

.hero {
  padding: clamp(56px, 9vw, 104px) 0 0;
  text-align: center;
  overflow: hidden;
}

.hero .app-icon {
  width: clamp(96px, 12vw, 132px);
  height: auto;
  margin: 0 auto 26px;
}

.hero h1 {
  max-width: 13em;
  margin-inline: auto;
}

.hero .lede {
  max-width: 31em;
  margin-inline: auto;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px 26px;
  margin-top: 32px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--pill-bg);
  color: var(--pill-text);
  font-size: 17px;
  font-weight: 500;
  padding: 12px 22px;
  border-radius: 999px;
}

.pill small {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.7;
}

.more {
  font-size: 17px;
  color: var(--link);
}

.more::after {
  content: " ›";
}

.meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  row-gap: 4px;
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.meta span {
  white-space: nowrap;
}

.meta span + span::before {
  content: "·";
  margin: 0 8px;
  opacity: 0.6;
}

.hero-mock {
  margin: clamp(48px, 7vw, 80px) auto 0;
  max-width: 640px;
  text-align: left;
  padding-bottom: clamp(24px, 4vw, 48px);
}

/* ---------- Sections ---------- */

section {
  padding: clamp(80px, 11vw, 140px) 0;
}

.alt {
  background: var(--bg-alt);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.section-head.center {
  margin-inline: auto;
}

/* Three statements */

.trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  border-top: 1px solid var(--line);
  padding-top: 40px;
}

.trio h3 {
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.03em;
}

.trio p {
  color: var(--muted);
  margin: 10px 0 0;
}

@media (max-width: 760px) {
  .trio {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* Split: copy + visual */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

.split > * {
  min-width: 0;
}

@media (max-width: 860px) {
  .split {
    grid-template-columns: 1fr;
  }
}

/* Tiles */

.tiles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.tile {
  background: var(--surface);
  border-radius: 22px;
  padding: 30px 28px;
  min-width: 0;
}

.alt .tile {
  background: var(--surface);
}

section:not(.alt) .tile {
  background: var(--bg-alt);
}

.tile p {
  color: var(--muted);
  margin: 10px 0 0;
}

.tile .tile-k {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-text);
  letter-spacing: 0.01em;
  margin: 0 0 8px;
}

@media (max-width: 860px) {
  .tiles {
    grid-template-columns: 1fr 1fr;
  }
}

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

/* ---------- macOS-style mock lists ---------- */

.mock {
  min-width: 0;
  background: var(--surface);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
  font-size: 14px;
  letter-spacing: -0.005em;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.mock-bar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #ff5f57;
}

.mock-bar i:nth-child(2) {
  background: #febc2e;
}

.mock-bar i:nth-child(3) {
  background: #28c840;
}

.mock-bar b {
  margin-left: 10px;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
}

.mock-body {
  padding: 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.mock-app {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mock-app strong {
  display: block;
  font-size: 15px;
}

.mock-app span {
  color: var(--muted);
  font-size: 12px;
}

.mock-app .danger {
  background: #d1242f;
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  white-space: nowrap;
}

.group-label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin: 2px 4px 6px;
}

.rows {
  background: var(--surface-2);
  border-radius: 10px;
  overflow: hidden;
}

.row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  min-width: 0;
}

.row + .row {
  border-top: 1px solid var(--line);
}

.row .path {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 12px;
}

.row .size {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.row.dim .path {
  color: var(--muted);
}

.box {
  flex: none;
  width: 15px;
  height: 15px;
  border-radius: 4px;
  border: 1.5px solid var(--line);
  background: var(--surface);
}

.box.on {
  border-color: transparent;
  background: var(--accent)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.4l2.6 2.6L12 5.4' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 13px no-repeat;
}

.box.none {
  border-style: dashed;
}

.badge {
  flex: none;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
  background: var(--neutral-bg);
  color: var(--muted);
}

.badge.ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.badge.warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.mock-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.mock-foot .go {
  background: var(--accent-text);
  color: #fff;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 7px;
}

@media (prefers-color-scheme: dark) {
  .app-icon {
    box-shadow: 0 0 0 1px rgba(234, 247, 245, 0.1), 0 14px 34px -14px rgba(0, 0, 0, 0.8);
  }

  .mock-foot .go {
    color: #071c27;
  }
}

@media (max-width: 480px) {
  .row .badge.opt {
    display: none;
  }
}

/* ---------- Dark section (Safety) ---------- */

.dark {
  background: var(--dark-bg);
  color: var(--dark-text);
  --ink: var(--dark-text);
  --muted: var(--dark-muted);
  --line: var(--dark-line);
  --accent: var(--dark-accent);
  --accent-text: var(--dark-accent);
  --link: #8ae8d6;
  --surface: var(--dark-surface);
  --bg-alt: var(--dark-surface);
}

@media (prefers-color-scheme: dark) {
  .dark {
    background: #041219;
  }
}

.dark code {
  background: rgba(234, 247, 245, 0.08);
  color: var(--dark-text);
}

.steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.steps li {
  counter-increment: step;
  border-top: 2px solid var(--line);
  padding-top: 18px;
  min-width: 0;
}

.steps li:last-child {
  border-top-color: var(--accent);
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 10px;
}

.steps strong {
  display: block;
  font-family: var(--display);
  font-size: 21px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.steps span {
  color: var(--muted);
  font-size: 15px;
}

@media (max-width: 960px) {
  .steps {
    grid-template-columns: 1fr 1fr;
    row-gap: 32px;
  }
}

@media (max-width: 520px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.checks {
  list-style: none;
  margin: clamp(56px, 8vw, 88px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px 48px;
}

.checks li {
  position: relative;
  padding-left: 30px;
  color: var(--muted);
}

.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.4l2.6 2.6L12 5.4' fill='none' stroke='%23071C27' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 13px no-repeat;
}

@media (max-width: 760px) {
  .checks {
    grid-template-columns: 1fr;
  }
}

/* ---------- Closing ---------- */

.closing {
  text-align: center;
}

.closing .app-icon {
  width: 88px;
  height: auto;
  margin: 0 auto 26px;
}

/* ---------- Footer ---------- */

footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  padding: 22px 0 28px;
}

.footer-note {
  margin: 0 0 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 20px;
}

footer a {
  color: var(--text);
}

.footer-note a,
.doc p a,
.doc li a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

footer a:hover {
  color: var(--link);
}

footer nav a + a::before {
  content: "|";
  color: var(--line);
  margin: 0 10px;
}

/* ---------- Document page (privacy) ---------- */

.doc {
  padding: clamp(56px, 8vw, 96px) 0 clamp(72px, 10vw, 120px);
}

.doc .wrap {
  max-width: 720px;
}

.doc h1 {
  font-size: clamp(40px, 6vw, 64px);
}

.doc .updated {
  color: var(--muted);
  font-size: 15px;
  margin: 14px 0 0;
}

.doc .lede {
  margin: 28px 0 8px;
}

.doc h2 {
  font-size: clamp(24px, 3vw, 30px);
  letter-spacing: -0.025em;
  margin: 48px 0 12px;
}

.doc p,
.doc li {
  color: var(--text);
  text-wrap: pretty;
}

.doc ul {
  padding-left: 1.2em;
}

.doc li + li {
  margin-top: 6px;
}

/* ---------- Reveal on scroll ---------- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition:
      opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
      transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  }

  .js .reveal.in {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}