/* =========================================================
   SimplePhotoFrame LP — Design System v2
   Language-agnostic · Single source of truth
   Preserves all --spf-* variables from v1
   ========================================================= */

:root {
  /* ===== Brand & semantic colors (preserved v1) ===== */
  --spf-bg: #f7f9fc;
  --spf-surface: #ffffff;
  --spf-text: #0f172a;
  --spf-muted: #475569;
  --spf-primary: #0b7a9c;
  --spf-primary-dark: #085f7b;
  --spf-accent: #10b981;
  --spf-sun: #f59e0b;
  --spf-sustainable-bg: #ecfdf5;
  --spf-sustainable-text: #065f46;
  --spf-reuse-bg: #eff6ff;
  --spf-reuse-text: #1e3a8a;
  --spf-border: #e2e8f0;
  --spf-content-width: 1120px;

  /* ===== New — Typography scale ===== */
  --fs-h1: clamp(2.1rem, 2.8vw + 1rem, 3.3rem);
  --fs-h2: clamp(1.65rem, 1.4vw + 1rem, 2.25rem);
  --fs-h3: clamp(1.1rem, 0.2vw + 1rem, 1.25rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9rem;
  --lh-h1: 1.15;
  --lh-h2: 1.25;
  --lh-body: 1.75;

  /* ===== New — Elevation (E0…E3) ===== */
  --e0: 0 0 0 0 transparent;
  --e1: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --e2: 0 10px 26px rgba(11, 122, 156, 0.32);
  --e3: 0 30px 70px rgba(11, 122, 156, 0.24);

  /* ===== New — Radius scale ===== */
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* ===== New — Spacing rhythm ===== */
  --section-py: 88px;
  --section-py-mobile: 64px;
  --gap-card: 20px;
}

/* ================= Reset & Base ================= */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--spf-bg);
  color: var(--spf-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Noto Sans SC", "Noto Sans SC", "Noto Sans", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a {
  color: var(--spf-primary-dark);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, h5, h6 {
  color: var(--spf-text);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0;
}
h1 { font-size: var(--fs-h1); line-height: var(--lh-h1); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: var(--fs-h2); line-height: var(--lh-h2); font-weight: 700; }
h3 { font-size: var(--fs-h3); font-weight: 700; }
p, ul, ol, dl { margin: 0; }
ul, ol { padding-left: 1.2em; }
li + li { margin-top: 0.3em; }
strong { font-weight: 700; color: var(--spf-text); }

/* ================= Layout ================= */
.container {
  max-width: var(--spf-content-width);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 24px);
  width: 100%;
}

/* ================= Site Header (sticky blur) ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  transform: translateZ(0);
}
.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--spf-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand-badge {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--spf-primary), var(--spf-accent));
  display: inline-grid; place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 10px rgba(11, 122, 156, 0.18);
}

/* ================= Language switcher ================= */
.lang-switch ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
}
.lang-switch a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 4px 12px;
  border: 1px solid var(--spf-border);
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--spf-muted);
  background: var(--spf-surface);
  transition: all 0.15s ease;
}
.lang-switch a:hover {
  border-color: var(--spf-primary);
  color: var(--spf-primary-dark);
  text-decoration: none;
  transform: translateY(-1px);
}
.lang-switch a.is-active,
.lang-switch a.active,
.lang-switch a[aria-current="page"] {
  background: var(--spf-primary);
  border-color: var(--spf-primary);
  color: #fff;
  box-shadow: 0 6px 14px rgba(11, 122, 156, 0.22);
}

/* ================= Breadcrumb ================= */
.breadcrumb {
  padding: 18px 0 0;
  font-size: var(--fs-small);
  color: var(--spf-muted);
}
.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb li + li::before {
  content: "/";
  display: inline-block;
  margin-right: 6px;
  color: #94a3b8;
}
.breadcrumb a { color: var(--spf-muted); }
.breadcrumb a:hover { color: var(--spf-primary-dark); }

/* ================= Section base ================= */
.section {
  padding-block: var(--section-py);
  border-bottom: 1px solid var(--spf-border);
  position: relative;
}
.section h2 {
  margin-bottom: 12px;
}
.section .section-lead {
  color: var(--spf-muted);
  margin-bottom: 36px;
  max-width: 740px;
  font-size: 1.05rem;
}

/* ================= Hero ================= */
.hero {
  padding: 64px 0 88px;
  background:
    radial-gradient(1200px 520px at 88% -30%, rgba(16, 185, 129, 0.18), transparent 60%),
    radial-gradient(900px 420px at -12% 20%, rgba(11, 122, 156, 0.16), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, var(--spf-bg) 100%);
  border-bottom: 1px solid var(--spf-border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(15, 23, 42, 0.035) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(ellipse at center, #000 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 40%, transparent 80%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.12);
  color: var(--spf-sustainable-text);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--r-pill);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}
.hero h1 {
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.125rem;
  color: var(--spf-muted);
  margin-bottom: 32px;
  max-width: 600px;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.hero-note {
  margin-top: 18px;
  color: var(--spf-muted);
  font-size: var(--fs-small);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-note::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--spf-accent);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.18);
}

/* Hero visual mockup */
.hero-art {
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-xl);
  padding: 22px;
  box-shadow: var(--e1);
  position: relative;
  transform: rotate(-1deg);
  transition: transform 0.4s ease;
}
.hero-art:hover { transform: rotate(0deg) translateY(-4px); }
.hero-frame {
  aspect-ratio: 16 / 10;
  border-radius: var(--r-lg);
  background:
    linear-gradient(135deg, #c7d2fe 0%, #a7f3d0 55%, #fde68a 100%);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: #0b1020;
}
.hero-frame::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(255,255,255,0.45), transparent 55%);
  pointer-events: none;
}
.hero-frame .photo-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 16px 20px;
  border-radius: var(--r-md);
  max-width: 82%;
  text-align: center;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
  border: 1px solid rgba(255,255,255,0.5);
  position: relative;
  z-index: 2;
}
.hero-frame .photo-card strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 2px;
}
.hero-frame .photo-card span {
  font-size: 0.9rem;
  color: var(--spf-muted);
}
.hero-frame .clock {
  position: absolute;
  top: 16px; right: 16px;
  background: rgba(15, 23, 42, 0.76);
  color: #fff;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  z-index: 2;
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-legend {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--spf-muted);
}
.hero-legend span {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f8fafc;
  border: 1px solid var(--spf-border);
  border-radius: var(--r-sm);
  padding: 10px 12px;
  font-weight: 600;
}
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot.green { background: var(--spf-accent); }
.dot.blue  { background: var(--spf-primary); }
.dot.amber { background: var(--spf-sun); }

/* ================= Buttons ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
  padding: 12px 22px;
  border-radius: var(--r-md);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.2;
  transition: transform 0.08s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.15s ease, color 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.005em;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--spf-primary);
  color: #fff;
  box-shadow: var(--e2);
}
.btn-primary:hover {
  background: var(--spf-primary-dark);
  box-shadow: 0 14px 32px rgba(11, 122, 156, 0.38);
}
.btn-ghost {
  background: var(--spf-surface);
  color: var(--spf-text);
  border-color: var(--spf-border);
}
.btn-ghost:hover {
  border-color: var(--spf-primary);
  color: var(--spf-primary-dark);
  background: #f8fafc;
}

/* ================= Grids generic ================= */
.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-card);
}
.card-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-card);
}
.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap-card);
}

/* ================= Card base ================= */
.card {
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-lg);
  padding: 26px 24px;
  box-shadow: var(--e1);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 38px rgba(15, 23, 42, 0.09);
  border-color: #cbd5e1;
}
.card h3 { margin-bottom: 2px; }
.card p { color: var(--spf-muted); font-size: 0.98rem; }
.card .icon {
  width: 44px; height: 44px;
  border-radius: var(--r-sm);
  display: inline-grid; place-items: center;
  font-size: 1.2rem;
  background: #eef2ff;
  color: #4338ca;
  margin-bottom: 6px;
  flex-shrink: 0;
}
.card.problem .icon { background: #fef2f2; color: #b91c1c; }
.card.sus .icon     { background: #d1fae5; color: var(--spf-sustainable-text); }
.card.reuse .icon   { background: #dbeafe; color: var(--spf-reuse-text); }

/* ================= Concept tinted sections ================= */
.section-concept-sustainable {
  background: var(--spf-sustainable-bg);
  border-bottom: 1px solid #d1fae5;
}
.section-concept-sustainable h2,
.section-concept-sustainable h3 { color: var(--spf-sustainable-text); }
.section-concept-sustainable .card {
  border-color: #a7f3d0;
  background: linear-gradient(180deg, #ffffff 0%, #f0fdf4 100%);
}
.section-concept-sustainable .card .icon { background: #a7f3d0; color: var(--spf-sustainable-text); }

.section-concept-reuse {
  background: var(--spf-reuse-bg);
  border-bottom: 1px solid #dbeafe;
}
.section-concept-reuse h2,
.section-concept-reuse h3 { color: var(--spf-reuse-text); }
.section-concept-reuse .card {
  border-color: #bfdbfe;
  background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
}
.section-concept-reuse .card .icon { background: #bfdbfe; color: var(--spf-reuse-text); }

/* Bullets list in concept sections */
.bullet-list,
.concept-points ul {
  list-style: none;
  padding: 0;
  margin: 0 0 36px;
  max-width: 820px;
  display: grid;
  gap: 12px;
}
.bullet-list li,
.concept-points ul li {
  padding: 14px 18px 14px 44px;
  background: #fff;
  border: 1px solid var(--spf-border);
  border-radius: var(--r-md);
  position: relative;
  font-size: 1rem;
}
.bullet-list li::before,
.concept-points ul li::before {
  content: "";
  position: absolute;
  left: 16px; top: 50%;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--spf-accent);
  transform: translateY(-50%);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath d='M16.7 5.3a1 1 0 0 1 0 1.4l-7.5 7.5a1 1 0 0 1-1.4 0L3.3 9.7a1 1 0 0 1 1.4-1.4l3.8 3.8 6.8-6.8a1 1 0 0 1 1.4 0z'/%3E%3C/svg%3E");
  background-size: 14px 14px;
  background-repeat: no-repeat;
  background-position: center;
}

/* Use cases (tag cards) */
.section h3 + .usecases,
.section h3 + div > .usecases {
  margin-top: 20px;
}
.usecases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-card);
  margin-top: 18px;
  padding-top: 4px;
}
.usecase {
  border-radius: var(--r-lg);
  background: #fff;
  border: 1px solid #bfdbfe;
  padding: 44px 22px 22px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  overflow: visible;
  margin-top: 12px;
}
.usecase:first-child { margin-top: 12px; }
.usecase:hover {
  transform: translateY(-3px);
  box-shadow: var(--e1);
}
.usecase .tag {
  position: absolute;
  top: -16px;
  left: 18px;
  background: linear-gradient(135deg, var(--spf-primary), var(--spf-accent));
  color: #fff;
  padding: 0 16px;
  height: 36px;
  min-width: 56px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 10px 20px rgba(11, 122, 156, 0.28);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  white-space: nowrap;
}
.usecase h3 { margin: 0 0 8px; }
.usecase p  { margin: 0; color: var(--spf-muted); font-size: 0.95rem; line-height: 1.65; }

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-card);
  counter-reset: step;
  margin-top: 12px;
}
.step {
  position: relative;
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-lg);
  padding: 30px 22px 22px;
  box-shadow: var(--e1);
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: -18px; left: 20px;
  height: 38px;
  padding: 0 14px;
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--spf-primary), var(--spf-accent));
  color: #fff;
  display: inline-grid;
  place-items: center;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px rgba(11, 122, 156, 0.28);
  font-size: 0.9rem;
}
.step h3 { margin: 8px 0 6px; }
.step p  { margin: 0; color: var(--spf-muted); }

/* ================= Settings + Language cards ================= */
.settings-wrap {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
  align-items: start;
}
.setting-list {
  display: grid;
  gap: 10px;
}
.setting-list dt {
  font-weight: 700;
  font-size: 1rem;
  color: var(--spf-text);
}
.setting-list dd {
  margin: 0 0 10px;
  color: var(--spf-muted);
  padding-left: 0;
}

/* Matte palette */
.matte-palette {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 14px;
}
.swatch {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-sm);
  border: 1px solid var(--spf-border);
  display: grid;
  place-items: end start;
  padding: 8px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.45);
  color: #0b1020;
  transition: transform 0.15s ease;
}
.swatch:hover { transform: translateY(-2px); }
.matte-palette > :nth-child(1) { color: #e2e8f0 !important; }
.matte-palette > :nth-child(2) { color: #1f2937 !important; }
.matte-palette > :nth-child(3) { color: #ffffff !important; }
.matte-palette > :nth-child(4) { color: #ffffff !important; }
.matte-palette > :nth-child(5) { color: #ffffff !important; }
.matte-palette > :nth-child(6) { color: #ffffff !important; }
.matte-palette > :nth-child(7) { color: #ffffff !important; }
.matte-palette > :nth-child(8) { color: #ffffff !important; }
.swatch.dark     { background: #0f172a; color: #e2e8f0; }
.swatch.white    { background: #ffffff; }
.swatch.ocean    { background: #0ea5e9; color: #fff; }
.swatch.sunset   { background: linear-gradient(135deg, #fb7185, #f59e0b); color: #fff; }
.swatch.forest   { background: #059669; color: #fff; }
.swatch.rose     { background: #fb7185; color: #fff; }
.swatch.lavender { background: #a78bfa; color: #fff; }
.swatch.oak      { background: #92400e; color: #fff; }

/* Language cards */
.langs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.lang-card {
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-md);
  padding: 18px 18px 16px;
  min-height: 164px;
  display: block;
  transition: border-color 0.15s ease, transform 0.15s ease;
  overflow-wrap: anywhere;
  word-break: keep-all;
  line-height: 1.55;
}
.lang-card::after {
  content: "";
  display: block;
  clear: both;
}
.lang-card:hover {
  border-color: var(--spf-primary);
  transform: translateY(-2px);
}
.lang-card .flag,
.lang-card > div.lang-main {
  float: right;
  font-size: 1.5rem;
  line-height: 1;
  margin: 0 0 8px 10px;
}
.lang-card > span.badge {
  float: right;
  clear: right;
  margin: 0 0 6px -80px;
}
.lang-card strong,
.lang-card h3,
.lang-card h4,
.lang-card .lang-name {
  display: block;
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--spf-text);
}
.lang-card .lang-name { font-size: 0.98rem; }
.lang-card span,
.lang-card p {
  display: block;
  margin: 0;
  font-size: 0.86rem;
  color: var(--spf-muted);
  line-height: 1.55;
}
.badge {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: #ecfeff;
  color: #0e7490;
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid #a5f3fc;
  letter-spacing: 0.02em;
}

/* ================= Privacy box ================= */
.privacy-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.privacy-box .card {
  border-left: 4px solid var(--spf-accent);
}
.privacy-box .card h3 {
  color: var(--spf-text);
  margin-bottom: 8px;
  padding-right: 20px;
}

/* ================= FAQ ================= */
.faq-list {
  display: grid;
  gap: 12px;
  max-width: 900px;
}
details.faq {
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-md);
  padding: 16px 22px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
details.faq[open] {
  border-color: var(--spf-primary);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.06);
}
details.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  min-height: 32px;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  display: inline-grid; place-items: center;
  background: #f1f5f9;
  color: var(--spf-primary);
  font-weight: 800;
  font-size: 1.1rem;
  transition: transform 0.2s ease, background 0.15s ease;
}
details.faq[open] summary::after {
  content: "−";
  background: var(--spf-primary);
  color: #fff;
  transform: rotate(180deg);
}
details.faq p {
  margin: 14px 0 4px;
  color: var(--spf-muted);
  padding-right: 40px;
}

/* ================= Why / Testimonials ================= */
.testi-bullets,
.section-why ul {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 880px;
  display: grid;
  gap: 14px;
}
.testi-bullets li,
.section-why ul li {
  padding: 20px 24px;
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-md);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
  position: relative;
  padding-left: 56px;
}
.testi-bullets li::before,
.section-why ul li::before {
  content: "“";
  position: absolute;
  left: 18px; top: 12px;
  font-size: 2.2rem;
  color: var(--spf-primary);
  font-family: Georgia, serif;
  line-height: 1;
  font-weight: 800;
}

/* ================= Final CTA ================= */
.final-cta {
  padding: 80px 0 96px;
  background:
    radial-gradient(900px 340px at 50% 0%, rgba(11, 122, 156, 0.15), transparent 60%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}
.final-cta-box {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  padding: 48px 36px;
  border-radius: 28px;
  background:
    radial-gradient(600px 260px at 100% 0%, rgba(16, 185, 129, 0.35), transparent 55%),
    radial-gradient(600px 260px at 0% 100%, rgba(11, 122, 156, 0.45), transparent 55%),
    linear-gradient(135deg, #0b7a9c 0%, #0e9c7e 60%, #10b981 100%);
  color: #fff;
  box-shadow: var(--e3);
  position: relative;
  overflow: hidden;
}
.final-cta-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.6;
  pointer-events: none;
}
.final-cta-box > * { position: relative; z-index: 1; }
.final-cta-box h2 {
  color: #fff;
  margin-bottom: 12px;
  text-shadow: 0 2px 12px rgba(15, 23, 42, 0.18);
}
.final-cta-box p {
  opacity: 0.94;
  font-size: 1.05rem;
  max-width: 620px;
  margin: 0 auto;
}
.final-cta-box .btn {
  margin-top: 28px;
  min-height: 56px;
  padding: 14px 28px;
  background: #ffffff;
  color: #075985;
  border-color: #ffffff;
  font-size: 1.05rem;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.22);
}
.final-cta-box .btn:hover {
  background: #f1f5f9;
  color: #0c4a6e;
}

/* ================= Site Footer ================= */
.site-footer {
  background: #0b1020;
  color: #cbd5e1;
  padding: 48px 0 32px;
}
.site-footer a { color: #e2e8f0; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-grid h3 {
  color: #fff;
  font-size: 0.9rem;
  margin: 0 0 14px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-weight: 700;
}
.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}
.footer-grid ul li { margin: 0; }
.footer-grid .footer-brand p {
  color: #94a3b8;
  margin-top: 10px;
  max-width: 320px;
  font-size: var(--fs-small);
  line-height: 1.7;
}
.footer-grid .footer-brand .brand {
  color: #fff;
}
.copyright {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: #64748b;
  font-size: var(--fs-small);
  text-align: center;
}

/* ================= Article pages (privacy / terms / support) ================= */
.article-wrap {
  padding: 28px 0 80px;
}
.article {
  background: var(--spf-surface);
  border: 1px solid var(--spf-border);
  border-radius: var(--r-xl);
  padding: clamp(22px, 4vw, 44px);
  margin: 16px 0 0;
  box-shadow: var(--e1);
  position: relative;
  overflow: hidden;
}
.article::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--spf-primary), var(--spf-accent));
}
.article h1 {
  margin-top: 8px;
  font-size: clamp(1.6rem, 1.4vw + 1rem, 2.1rem);
  margin-bottom: 10px;
}
.article h2 {
  margin-top: 36px;
  font-size: 1.25rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--spf-border);
}
.article h3 {
  margin-top: 24px;
  font-size: 1.08rem;
}
.article p, .article li { color: #1f2937; }
.article p  { margin: 10px 0; }
.article ul { padding-left: 1.4em; }
.article-meta {
  color: var(--spf-muted);
  font-size: var(--fs-small);
  margin-bottom: 24px;
}

/* ================= Focus & A11y ================= */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
.btn:focus-visible,
.lang-switch a:focus-visible {
  outline: 3px solid rgba(11, 122, 156, 0.5);
  outline-offset: 2px;
  border-radius: var(--r-md);
}
.lang-switch a:focus-visible,
.badge:focus-visible { border-radius: var(--r-pill); }

/* ================= Responsive ================= */
@media (max-width: 960px) {
  :root { --section-py: 72px; }
  .hero { padding: 48px 0 72px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-art { max-width: 540px; margin-inline: auto; width: 100%; }
  .settings-wrap { grid-template-columns: 1fr; }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .usecases    { grid-template-columns: repeat(2, 1fr); }
  .steps       { grid-template-columns: 1fr; }
  .langs       { grid-template-columns: repeat(2, 1fr); }
  .privacy-box { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-grid .footer-brand { grid-column: 1 / -1; }
  .matte-palette { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 560px) {
  :root { --section-py: var(--section-py-mobile); }
  .site-header .header-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero { padding: 32px 0 56px; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
  .card-grid-4,
  .card-grid-3,
  .card-grid-2,
  .usecases,
  .langs { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-grid .footer-brand { grid-column: 1 / -1; }
  .matte-palette { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero-legend { grid-template-columns: 1fr; }
  .final-cta-box { padding: 36px 22px; border-radius: 22px; }
  .final-cta-box .btn { width: 100%; }
  .article { padding: 22px 18px; }
  details.faq { padding: 14px 16px; }
  details.faq p { padding-right: 0; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
}