/* ============================================================
   Xiyu.Studio — Design Tokens
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;1,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Fraunces:ital,opsz,wght@1,9..144,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=STIX+Two+Text:ital,wght@0,400;0,500;1,400;1,500;1,600&display=swap');

:root{
  /* brand ribbon gradient — pink -> purple -> blue -> teal */
  --grad-1:#F15E6F;
  --grad-2:#6E63F0;
  --grad-3:#45ACE5;
  --grad-4:#2EE5B8;
  --gradient-ribbon: linear-gradient(115deg, var(--grad-1) 0%, var(--grad-2) 34%, var(--grad-3) 66%, var(--grad-4) 100%);
  --gradient-ribbon-soft: linear-gradient(115deg, color-mix(in srgb, var(--grad-1) 60%, white) 0%, color-mix(in srgb, var(--grad-2) 60%, white) 34%, color-mix(in srgb, var(--grad-3) 60%, white) 66%, color-mix(in srgb, var(--grad-4) 60%, white) 100%);

  --ink-900:#0c0c10;
  --ink-700:#2b2b33;
  --ink-500:#6a6a76;
  --ink-300:#a9a9b3;
  --ink-100:#e7e7ec;

  --paper-0:#fdfcfb;
  --paper-1:#f7f6f4;
  --paper-2:#f1f0ee;
  --line: rgba(12,12,16,0.1);

  --radius-s: 10px;
  --radius-m: 20px;
  --radius-l: 32px;
  --radius-pill: 999px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 160px;

  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-in-out: cubic-bezier(.65,0,.35,1);
  --dur-s: 200ms;
  --dur-m: 400ms;
  --dur-l: 700ms;

  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Fraunces', Georgia, serif;
  --font-math: 'STIX Two Text', 'Times New Roman', serif;

  --container: 1320px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{
  scroll-behavior: auto;
  background: var(--paper-0);
}
html.has-lenis{ scroll-behavior: auto; }

body{
  margin:0;
  font-family: var(--font-sans);
  color: var(--ink-900);
  background: var(--paper-0);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  cursor: default;
}

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

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

button{ font-family: inherit; }

::selection{ background: var(--grad-2); color:#fff; }

.container{
  width:100%;
  max-width: var(--container);
  margin-inline:auto;
  padding-inline: var(--space-3);
}

@media (min-width: 900px){
  .container{ padding-inline: var(--space-5); }
}

/* ---------- Typography ---------- */
h1,h2,h3,h4{
  margin:0;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-500);
}
.eyebrow::before{
  content:'';
  width: 6px; height:6px; border-radius:50%;
  background: var(--gradient-ribbon);
}

.serif{ font-family: var(--font-serif); font-weight:500; letter-spacing:-0.01em; }
.serif-italic{ font-family: var(--font-serif); font-style: italic; font-weight:500; }

.text-gradient{
  background: var(--gradient-ribbon);
  -webkit-background-clip: text;
  background-clip:text;
  color: transparent;
}

.lead{
  font-size: clamp(1.05rem, 1.3vw, 1.35rem);
  color: var(--ink-500);
  line-height: 1.6;
  max-width: 46ch;
}

.section-title{
  font-size: clamp(2rem, 4vw, 3.4rem);
}

/* ---------- Buttons ---------- */
.btn{
  position: relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding: 16px 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-900);
  transition: background var(--dur-m), color var(--dur-m), border-color var(--dur-m), box-shadow var(--dur-m);
  white-space: nowrap;
}
.btn:hover{ box-shadow: 0 10px 30px -10px rgba(110,99,240,0.45); }

.btn-primary{
  border:none;
  color:#fff;
  background: var(--gradient-ribbon);
  background-size: 160% 160%;
  box-shadow: 0 8px 30px -8px rgba(110,99,240,0.55);
}
.btn-primary:hover{ background-position: 100% 0; }

.btn-ghost{
  border-color: var(--line);
}
.btn-ghost:hover{
  border-color: transparent;
  background: var(--ink-900);
  color: var(--paper-0);
}

.btn svg{ width:16px; height:16px; transition: transform var(--dur-m) var(--ease-out); }
.btn:hover svg{ transform: translateX(3px); }

/* ---------- Utility ---------- */
.visually-hidden{
  position:absolute; width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}