/* =========================================================
   Nordthink AB — design system
   Dark nordic-tech palette, Inter + IBM Plex Mono
   ========================================================= */

:root {
  --bg: #131316;
  --bg-deep: #101013;
  --panel: #16161a;
  --line: rgba(249, 249, 249, 0.08);
  --line-soft: rgba(249, 249, 249, 0.05);
  --ink: #f4f7f2;
  --ink-70: rgba(244, 247, 242, 0.7);
  --ink-55: rgba(244, 247, 242, 0.55);
  --ink-40: rgba(244, 247, 242, 0.4);
  --accent: #22c55e;
  --accent-hi: #4ade80;
  --danger: #f87171;
  --radius: 12px;
  --font-sans: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --ease: cubic-bezier(0.25, 1, 0.5, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

.mono {
  font-family: var(--font-mono);
  font-feature-settings: 'tnum' 1;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}
@media (max-width: 640px) { .container { padding: 0 1rem; } }

.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- nav ---------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding: 1rem 2rem 0;
}
.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(19, 19, 22, 0.7);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.brand {
  display: flex;
  align-items: center;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand b { color: var(--accent); font-weight: 700; }
.nav-links {
  display: flex;
  gap: 1.75rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-55);
}
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }
@media (max-width: 820px) { .nav-links { display: none; } }

.btn-lang {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-55);
  background: none;
  border: 1px solid rgba(249, 249, 249, 0.15);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  transition: color 0.2s, border-color 0.2s;
}
.btn-lang:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 0.8rem 1.75rem;
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}
.btn-primary { background: var(--accent); color: #0b0d0c; }
.btn-primary:hover { background: var(--accent-hi); }
.btn-ghost { border-color: rgba(249, 249, 249, 0.2); color: var(--ink-70); background: none; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 0.5rem 1.1rem; font-size: 10px; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  padding: 11rem 0 6rem;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  top: -10rem;
  right: -10%;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.07);
  filter: blur(120px);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  align-items: center;
  gap: 3.5rem;
}
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 {
  margin-top: 1.5rem;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.03em;
}
.hero h1 .dim { color: var(--ink-40); }
.hero p.sub {
  margin-top: 1.75rem;
  max-width: 36rem;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--ink-55);
}
.hero-cta { margin-top: 2.5rem; display: flex; flex-wrap: wrap; gap: 1rem; }

/* hero chart card */
.chart-card {
  width: 100%;
  max-width: 28rem;
  margin-left: auto;
  background: rgba(22, 22, 26, 0.85);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
}
@media (max-width: 960px) { .chart-card { margin: 0 auto; } }
.chart-card .card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.live-dot {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
}
.live-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: nt-blink 3s linear infinite;
}
.chart-metrics {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.chart-metric {
  border: 1px solid var(--line-soft);
  background: rgba(249, 249, 249, 0.03);
  border-radius: 10px;
  padding: 0.8rem 1rem;
}
.chart-metric .label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.chart-metric .label::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: nt-pulse 2.7s linear infinite;
}
.chart-metric .value {
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
}

/* ---------- marquee ---------- */

.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}
.marquee-track {
  display: flex;
  width: max-content;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-40);
  animation: nt-marquee 36s linear infinite;
}
.marquee-track span { padding-right: 1rem; }

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-radius: 16px;
  overflow: hidden;
  margin: 5rem 0;
}
@media (max-width: 900px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--bg); padding: 2rem; }
.stat .num { font-size: 2.25rem; font-weight: 600; color: var(--accent); font-family: var(--font-mono); }
.stat .lbl {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-40);
}

/* ---------- services ---------- */

.section { padding: 5rem 0; }
.section h2 {
  margin-top: 1rem;
  max-width: 44rem;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.service-row {
  display: grid;
  grid-template-columns: 80px 1fr 2fr;
  align-items: baseline;
  gap: 1rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
  transition: background 0.3s;
}
.service-row:hover { background: rgba(249, 249, 249, 0.02); }
.service-row:last-of-type { border-bottom: 1px solid var(--line); }
.service-row .no { font-family: var(--font-mono); font-size: 0.875rem; color: var(--accent); }
.service-row h3 { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.01em; }
.service-row p { max-width: 36rem; color: var(--ink-55); line-height: 1.7; }
@media (max-width: 820px) { .service-row { grid-template-columns: 1fr; gap: 0.5rem; } }
.services-list { margin-top: 3.5rem; }

/* ---------- tools ---------- */

.tools-section { background: var(--bg-deep); position: relative; }
.tools-section .sub { margin-top: 1.25rem; max-width: 42rem; color: var(--ink-55); line-height: 1.7; }
.tool-cards { margin-top: 3.5rem; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
@media (max-width: 960px) { .tool-cards { grid-template-columns: 1fr; } }
.tool-card {
  display: block;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.3s, transform 0.3s;
}
.tool-card:hover { border-color: rgba(34, 197, 94, 0.5); transform: translateY(-4px); }
.tool-card .top { display: flex; justify-content: space-between; align-items: flex-start; }
.tool-card .arrow { color: var(--ink-40); transition: color 0.3s, transform 0.3s; }
.tool-card:hover .arrow { color: var(--accent); transform: translate(4px, -4px); }
.tool-card h3 { margin-top: 2rem; font-size: 1.5rem; font-weight: 600; }
.tool-card p { margin-top: 0.75rem; color: var(--ink-55); line-height: 1.7; }
.tool-card .meta {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-40);
}

/* ---------- about ---------- */

.about-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 3rem; }
@media (max-width: 960px) { .about-grid { grid-template-columns: 1fr; } }
.about-grid .body { font-size: 1.1rem; color: var(--ink-70); line-height: 1.8; }
.about-points { margin-top: 2rem; list-style: none; }
.about-points li { display: flex; align-items: center; gap: 0.75rem; color: var(--ink-70); padding: 0.4rem 0; }
.about-points li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex: none; }

/* ---------- footer ---------- */

footer { border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; padding: 5rem 0; }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h2 { margin-top: 1rem; font-size: clamp(2rem, 4vw, 3rem); font-weight: 600; letter-spacing: -0.02em; }
.footer-grid .sub { margin-top: 1.25rem; max-width: 28rem; color: var(--ink-55); line-height: 1.7; }
.footer-contact {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ink-70);
}
.footer-contact a.mail { font-size: 1.5rem; color: var(--ink); transition: color 0.2s; width: fit-content; }
.footer-contact a.mail:hover { color: var(--accent); }
.footer-contact a.tel { color: var(--ink-70); text-decoration: none; transition: color 0.2s; width: fit-content; }
.footer-contact a.tel:hover { color: var(--accent); }

/* WeChat QR — only visible in Chinese mode */
.wechat-qr { display: none; margin-top: 1rem; }
html[lang="zh-CN"] .wechat-qr { display: block; }
.wechat-qr img { width: 150px; height: auto; border-radius: 10px; display: block; }
.wechat-qr span { display: block; margin-top: 0.6rem; font-size: 0.75rem; color: var(--ink-40); }

/* Chinese language mode — font stack with Chinese glyph coverage */
html[lang="zh-CN"] body { font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif; }
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3 { letter-spacing: 0; }
.footer-contact .muted { color: var(--ink-40); font-size: 0.8rem; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-40);
}

/* ---------- tool pages ---------- */

.page-head { padding: 10rem 0 2.5rem; }
.page-head h1 { margin-top: 0.75rem; font-size: clamp(2rem, 4vw, 3rem); font-weight: 600; letter-spacing: -0.02em; }
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.breadcrumb a:hover { color: var(--accent); }

.tool-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  padding-bottom: 6rem;
  align-items: start;
}
@media (max-width: 960px) { .tool-layout { grid-template-columns: 1fr; } }

.panel {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 16px;
  padding: 1.75rem;
}
.panel-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 1.25rem;
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }

label.f-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-40);
  margin-bottom: 0.4rem;
}
.f-input, .f-select, .f-textarea {
  width: 100%;
  background: rgba(249, 249, 249, 0.04);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-size: 0.875rem;
  padding: 0.6rem 0.75rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.f-input:focus, .f-select:focus, .f-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}
.f-input[readonly] {
  opacity: 0.55;
  cursor: not-allowed;
}
.f-select option { background: var(--panel); }

.lines-head, .line-row {
  display: grid;
  grid-template-columns: 1fr 70px 60px 100px 80px 36px;
  gap: 0.5rem;
  align-items: center;
}
.lines-head {
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-40);
}
.line-row { margin-bottom: 0.5rem; }
@media (max-width: 640px) {
  .lines-head { display: none; }
  .line-row { grid-template-columns: 1fr 1fr; }
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--ink-40);
  padding: 0.3rem;
  transition: color 0.2s;
}
.icon-btn:hover { color: var(--accent); }
.icon-btn.danger:hover { color: var(--danger); }

.add-line {
  margin-top: 0.5rem;
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.add-line:hover { color: var(--accent-hi); }

.totals {
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.totals .row { display: flex; justify-content: space-between; padding: 0.25rem 0; color: var(--ink-55); }
.totals .row.grand {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  border-top: 1px solid var(--line);
  margin-top: 0.5rem;
  padding-top: 0.75rem;
}

.calc-box {
  margin-top: 1.5rem;
  border: 1px solid rgba(34, 197, 94, 0.25);
  background: rgba(34, 197, 94, 0.05);
  border-radius: 10px;
  padding: 1.25rem;
}

.form-actions { margin-top: 1.5rem; display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* saved list */
.saved-list { list-style: none; }
.saved-list li { padding: 1rem 0; border-bottom: 1px solid var(--line-soft); }
.saved-list li:last-child { border-bottom: none; }
.saved-item { display: flex; justify-content: space-between; gap: 1rem; }
.saved-item .id { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent); }
.saved-item .name { font-size: 0.9rem; color: var(--ink-70); margin-top: 0.15rem; }
.saved-item .dates { font-family: var(--font-mono); font-size: 10px; color: var(--ink-40); margin-top: 0.15rem; }
.saved-item .amount { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 600; text-align: right; }
.saved-item .ops { display: flex; justify-content: flex-end; gap: 0.25rem; margin-top: 0.4rem; }
.status-select {
  background: rgba(249, 249, 249, 0.04);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  padding: 0.25rem 0.4rem;
}
.status-select option { background: var(--panel); }
.empty-state { padding: 2rem 0; font-size: 0.875rem; color: var(--ink-40); }

/* toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  background: var(--panel);
  border: 1px solid rgba(34, 197, 94, 0.4);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.8rem 1.25rem;
  border-radius: 10px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ---------- motion ---------- */

@keyframes nt-fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-in { animation: nt-fade-up 0.9s var(--ease) both; }
.hero-in-1 { animation-delay: 0.12s; }
.hero-in-2 { animation-delay: 0.28s; }
.hero-in-3 { animation-delay: 0.44s; }
.hero-in-4 { animation-delay: 0.62s; }

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@keyframes nt-marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes nt-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
@keyframes nt-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.15; } }
@keyframes nt-dash { from { stroke-dashoffset: 1200; } to { stroke-dashoffset: 0; } }
.chart-line {
  stroke-dasharray: 1200;
  animation: nt-dash 2.6s var(--ease) 0.5s both;
}

@media (prefers-reduced-motion: reduce) {
  .hero-in, .chart-line, .marquee-track { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}