/* ==========================================================================
   伊月 · 共享样式 / Shared Styles
   设计令牌、排印基线、导航栏、页脚、通用 section 元素
   ========================================================================== */

:root {
  /* Moss greens */
  --moss-900: #0F2018; --moss-800: #152821; --moss-700: #1F3A2F;
  --moss-600: #2D4F40; --moss-500: #436B58; --moss-300: #8AA89A;
  --moss-100: #D4DFD8; --moss-50: #ECF1ED;

  /* Gold */
  --gold-700: #8A6F44; --gold-600: #9A7E52; --gold-500: #B89968;
  --gold-400: #C9AE82; --gold-200: #E5D5B8; --gold-100: #F2E8D5;

  /* Surfaces */
  --ivory: #F7F3EB; --surface: #FCFAF5; --paper: #FFFFFF;

  /* Ink (text) */
  --ink-900: #1A1815; --ink-700: #3D3A35; --ink-500: #5C5853;
  --ink-400: #8B8680; --ink-300: #B5B0A8; --ink-200: #D8D3CA;

  /* Lines */
  --line: #E5DFD3;

  /* Type */
  --font-serif: 'Fraunces', 'Noto Serif SC', serif;
  --font-sans: 'Manrope', 'Noto Sans SC', sans-serif;
  --font-cn-serif: 'Noto Serif SC', serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink-900);
  background: var(--ivory);
  font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* ============ ITALIC SPACING (CJK rescue) ============ */
em { padding-right: 0.16em; padding-left: 0.08em; }
h1 em, h2 em, h3 em, h4 em, h5 em, h6 em,
.article-title em, .featured-body h2 em, .ix-card h3 em,
.tool-name em, .step-title em, .number-row em {
  white-space: nowrap;
}
.founder-quote em,
.philo-statement em,
[style*="italic"] em {
  padding-right: 0;
  padding-left: 0;
}

/* ============ NAV ============ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 32, 24, 0.92);
  backdrop-filter: blur(20px);
  color: var(--ivory);
  padding: 18px 48px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(229,213,184,0.1);
}
.nav-brand { font-family: var(--font-serif); font-size: 18px; letter-spacing: 0.32em; font-weight: 300; }
.nav-brand .cn { font-family: var(--font-cn-serif); font-size: 14px; color: var(--gold-400); margin-left: 12px; letter-spacing: 0.18em; }
.nav-links { display: flex; gap: 36px; font-size: 13px; letter-spacing: 0.22em; color: var(--moss-100); font-family: var(--font-cn-serif); font-weight: 400; }
.nav-links a { cursor: pointer; transition: color 0.2s; }
.nav-links a:hover { color: var(--gold-400); }
.nav-links a.active { color: var(--gold-500); }
.nav-cta { padding: 9px 18px; border: 1px solid var(--gold-500); color: var(--gold-500); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; cursor: pointer; transition: all 0.2s; }
.nav-cta:hover { background: var(--gold-500); color: var(--moss-900); }

/* ============ SECTION TYPOGRAPHY ============ */
.section-eyebrow {
  font-size: 11px; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--gold-600);
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(40px, 5vw, 72px);
  line-height: 1.02;
  color: var(--moss-700);
  letter-spacing: -0.03em;
  margin-bottom: 32px;
  font-variation-settings: "opsz" 144;
  max-width: 880px;
}
.section-title em { font-style: italic; color: var(--gold-600); }
.section-title .cn { font-family: var(--font-cn-serif); font-weight: 300; }
.section-intro {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--ink-700);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 80px;
  font-weight: 300;
  font-variation-settings: "opsz" 36;
}

/* ============ BUTTONS ============ */
.btn {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  padding: 18px 40px;
  border: 1px solid transparent;
  cursor: pointer;
  background: none;
  transition: all 0.25s;
  display: inline-flex; align-items: center; gap: 12px;
  border-radius: 0;
  text-decoration: none;
}
.btn-primary { background: var(--moss-700); color: var(--ivory); border-color: var(--moss-700); }
.btn-primary:hover { background: var(--moss-800); border-color: var(--moss-800); }
.btn-ghost { background: transparent; color: var(--moss-700); padding: 18px 0; border-bottom: 1px solid var(--moss-700); }
.btn-ghost-dark { background: transparent; color: var(--gold-500); padding: 18px 0; border-bottom: 1px solid var(--gold-500); }

/* ============ FOOTER ============ */
footer {
  background: var(--moss-900);
  border-top: 1px solid rgba(229,213,184,0.1);
  padding: 96px 56px 40px;
  color: var(--moss-300);
  position: relative;
  overflow: hidden;
}
footer::before {
  content: ""; position: absolute;
  top: -180px; right: -220px;
  width: 520px; height: 520px;
  border: 1px solid rgba(184,153,104,0.14);
  border-radius: 50%;
  pointer-events: none;
}
footer::after {
  content: ""; position: absolute;
  top: -180px; right: -220px;
  width: 520px; height: 520px;
  background: radial-gradient(circle at 30% 50%, transparent 0%, transparent 49.5%, var(--moss-900) 50%);
  border-radius: 50%;
  pointer-events: none;
}
.footer-inner { max-width: 1160px; margin: 0 auto; position: relative; z-index: 2; }
.footer-ornament { display: flex; align-items: center; justify-content: center; gap: 14px; margin-bottom: 72px; }
.footer-ornament .o-line { flex: 1; height: 1px; background: repeating-linear-gradient(to right, rgba(184,153,104,0.35) 0 1px, transparent 1px 6px); }
.footer-ornament .o-glyph { font-family: var(--font-serif); font-style: italic; font-size: 14px; color: var(--gold-500); letter-spacing: 0.4em; text-transform: uppercase; font-weight: 300; }
.footer-ornament .o-diamond { width: 6px; height: 6px; background: var(--gold-500); transform: rotate(45deg); opacity: 0.7; }
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 64px;
  border-bottom: 1px solid rgba(229,213,184,0.15);
}
.footer-brand-col .footer-brand { font-family: var(--font-serif); font-size: 20px; letter-spacing: 0.32em; color: var(--ivory); font-weight: 300; margin-bottom: 24px; display: block; }
.footer-brand-col .footer-brand .cn { font-family: var(--font-cn-serif); color: var(--gold-400); margin-left: 12px; font-size: 14px; letter-spacing: 0.2em; }
.footer-tagline { font-family: var(--font-serif); font-size: 15px; color: var(--moss-100); line-height: 1.65; font-weight: 300; max-width: 280px; font-style: italic; }
.footer-col h4 { font-size: 10px; letter-spacing: 0.25em; text-transform: uppercase; color: var(--gold-400); margin-bottom: 20px; font-weight: 500; }
.footer-col ul { list-style: none; }
.footer-col ul li { padding: 0; font-size: 13px; font-family: var(--font-cn-serif); font-weight: 400; }
.footer-col ul li a { display: block; padding: 8px 0; color: var(--moss-100); transition: color 0.2s; text-decoration: none; }
.footer-col ul li a:hover { color: var(--gold-500); }
.footer-col ul li .en { font-family: var(--font-serif); font-style: italic; font-size: 11px; color: var(--moss-300); margin-left: 6px; font-weight: 400; }
.footer-bottom { padding-top: 32px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; font-size: 11px; letter-spacing: 0.1em; line-height: 1.8; }
.footer-legal { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.footer-legal a { color: var(--moss-300); transition: color 0.2s; text-decoration: none; }
.footer-legal a:hover { color: var(--gold-500); }
.footer-legal .dot { color: var(--moss-500); }

/* ============ ORNAMENTAL PATTERN BG (dark sections) ============
   Uses pattern_moons.png as a luminance mask, repeating tile of
   diamond + crescent moon. Subtle, never competes with foreground. */
.pattern-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: url("images/pattern_moons.png");
  background-size: 180px 180px;
  background-repeat: repeat;
  background-position: 0 0;
  opacity: 0.28;
  mix-blend-mode: soft-light;
  -webkit-mask-image: linear-gradient(
    var(--pattern-dir, 135deg),
    rgba(0,0,0,1) 0%,
    rgba(0,0,0,0.55) 35%,
    rgba(0,0,0,0.20) 65%,
    transparent 95%
  );
          mask-image: linear-gradient(
    var(--pattern-dir, 135deg),
    rgba(0,0,0,1) 0%,
    rgba(0,0,0,0.55) 35%,
    rgba(0,0,0,0.20) 65%,
    transparent 95%
  );
}
.pattern-bg.from-tl { --pattern-dir: 135deg; }
.pattern-bg.from-tr { --pattern-dir: 225deg; }
.pattern-bg.from-bl { --pattern-dir: 45deg; }
.pattern-bg.from-br { --pattern-dir: 315deg; }
.pattern-bg.from-top { --pattern-dir: 180deg; }
.pattern-bg.from-bottom { --pattern-dir: 0deg; }

/* ============ MOON PHASES ============ */
.moon-phases { display: flex; justify-content: center; align-items: center; gap: 36px; position: relative; }
.moon-phases::before {
  content: "";
  position: absolute;
  top: 50%; left: 12%; right: 12%; height: 1px;
  background: linear-gradient(to right, transparent, rgba(184,153,104,0.32) 18%, rgba(184,153,104,0.32) 82%, transparent);
  z-index: 0;
}
.moon-phases svg { position: relative; z-index: 1; background: var(--moss-900); padding: 0 8px; }
.moon-phases-label {
  position: relative; z-index: 1;
  background: var(--moss-900);
  padding: 0 16px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold-400);
  font-weight: 400;
  white-space: nowrap;
}
.moon-phases-label.is-large { font-size: 13px; letter-spacing: 0.28em; }

/* ============ RESPONSIVE BASELINE ============ */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  .nav { padding: 14px 24px; }
  .nav-links { display: none; }
  footer { padding-left: 24px; padding-right: 24px; }
  .footer-top { grid-template-columns: 1fr; }
}