/* ============================================
   REVVO SOLUTIONS — Design System
   Minimal · Professional · Two-theme
   ============================================ */

/* ── Tokens ─────────────────────────────────── */
:root {
  --accent: #1a6fd4;
  --accent-2: #00aaff;
  --accent-dark: #0d1b4b;
  --accent-hover: #155bb0;
  --accent-subtle: rgba(26, 111, 212, 0.08);
  --accent-border: rgba(26, 111, 212, 0.22);
  --accent-grad: linear-gradient(135deg, #1a6fd4 0%, #00aaff 100%);
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur: 220ms;
}

/* ── Dark theme (default) ────────────────────── */
:root,
[data-theme="dark"] {
  --bg: #080e1c;
  --bg-2: #0d1526;
  --bg-3: #111c30;
  --bg-4: #16233a;
  --bg-hover: #1c2d48;
  --line: rgba(0, 170, 255, 0.08);
  --line-strong: rgba(0, 170, 255, 0.15);
  --text-1: #eef2f8;
  --text-2: #8a9dbf;
  --text-3: #4a5c7a;
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.65);
}

/* ── Light theme ─────────────────────────────── */
[data-theme="light"] {
  --bg: #fafafa;
  --bg-2: #f3f3f6;
  --bg-3: #ebebef;
  --bg-4: #e2e2e8;
  --bg-hover: #d8d8e0;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.15);
  --text-1: #111114;
  --text-2: #55556a;
  --text-3: #9898a8;
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
}

/* ── Reset ───────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    system-ui,
    sans-serif;
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
::selection {
  background: var(--accent);
  color: #fff;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

/* ── Typography ──────────────────────────────── */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-1);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}
h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 800;
}
h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}
h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
}
h4 {
  font-size: 0.95rem;
  font-weight: 600;
}
p {
  color: var(--text-2);
  line-height: 1.75;
}

/* ── Layout ──────────────────────────────────── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 112px 0;
}
.section-sm {
  padding: 72px 0;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── Navigation ──────────────────────────────── */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  background: transparent;
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.nav.scrolled {
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 40px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-1);
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.nav-logo .logo-img {
  height: 36px;
  width: auto;
  display: block;
  flex-shrink: 0;
  padding: 0;
  background: none;
  border-radius: 0;
  /* Invert dark parts to white so logo is visible on dark navy background */
  filter: brightness(0) invert(1);
}
/* On light theme, show the original logo colors */
[data-theme="light"] .nav-logo .logo-img {
  filter: none;
  background: none;
  border: none;
}
.nav-logo span {
  display: none; /* hidden when image shows */
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.nav-links a {
  color: var(--text-2);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: all var(--dur) var(--ease);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-1);
  background: var(--bg-3);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 3px;
}
.lang-btn {
  background: none;
  border: none;
  color: var(--text-3);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  letter-spacing: 0.06em;
  font-family: inherit;
}
.lang-btn:hover {
  color: var(--text-1);
}
.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

/* Theme toggle */
.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-3);
  color: var(--text-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  transition: all var(--dur) var(--ease);
}
.theme-btn:hover {
  color: var(--text-1);
  background: var(--bg-4);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: var(--bg-3);
  border: 1px solid var(--line);
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
  padding: 9px;
  border-radius: var(--r-sm);
}
.nav-toggle span {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--text-1);
  border-radius: 2px;
  transition: all var(--dur) var(--ease);
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--r-md);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
  line-height: 1;
}
.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #155bb0 0%, #0090e0 100%);
  border-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(26, 111, 212, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text-1);
  border-color: var(--line-strong);
}
.btn-outline:hover {
  background: var(--bg-3);
  color: var(--text-1);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-2);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--bg-3);
  color: var(--text-1);
}
.btn-lg {
  padding: 13px 28px;
  font-size: 0.925rem;
  border-radius: var(--r-lg);
}
.btn-sm {
  padding: 7px 14px;
  font-size: 0.78rem;
}

/* ── Label (section eyebrow) ─────────────────── */
.label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}
.label::before {
  content: "";
  width: 18px;
  height: 1.5px;
  background: var(--accent);
  display: block;
}

/* ── Tags ────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  background: var(--bg-3);
  border: 1px solid var(--line);
  padding: 3px 9px;
  border-radius: var(--r-sm);
}
.tag-accent {
  color: var(--accent);
  background: var(--accent-subtle);
  border-color: var(--accent-border);
}

/* ── Section header ──────────────────────────── */
.section-header {
  margin-bottom: 56px;
}
.section-header.center {
  text-align: center;
}
.section-header.center p {
  max-width: 520px;
  margin: 0 auto;
}
.section-header h2 {
  margin-bottom: 10px;
}
.section-header > p {
  font-size: 1rem;
}

/* ── Divider ─────────────────────────────────── */
.divider {
  width: 36px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 20px;
}
.divider.center {
  margin-left: auto;
  margin-right: auto;
}

/* ── Cards ───────────────────────────────────── */
.card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px;
  transition:
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

/* ── Icon box ────────────────────────────────── */
.icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-2);
  font-size: 0.95rem;
  transition: all var(--dur) var(--ease);
}
.icon-box-lg {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-2);
  font-size: 1.1rem;
  margin-bottom: 18px;
  transition: all var(--dur) var(--ease);
}

/* ── Hero ────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  position: relative;
  overflow: hidden;
}
.hero-content {
  padding: 80px 0;
  max-width: 700px;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--accent);
  margin-bottom: 22px;
}
.hero-eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--accent);
  display: block;
}
.hero h1 {
  margin-bottom: 20px;
}
.hero h1 .accent-word {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.08rem);
  max-width: 520px;
  margin-bottom: 36px;
}
.hero-cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hero-rule {
  width: 100%;
  height: 1px;
  background: var(--line);
  margin: 60px 0 40px;
}
.hero-stats {
  display: flex;
  gap: 44px;
  flex-wrap: wrap;
}
.stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-1);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-3);
  font-weight: 500;
}

/* Hero geometric decoration */
.hero-deco {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 460px;
  height: 460px;
  pointer-events: none;
}
.hero-deco-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--line);
}
.hero-deco-ring:nth-child(1) {
  inset: 0;
}
.hero-deco-ring:nth-child(2) {
  inset: 50px;
}
.hero-deco-ring:nth-child(3) {
  inset: 100px;
  border-color: var(--accent-border);
}
.hero-deco-ring:nth-child(4) {
  inset: 150px;
  border-color: var(--accent-border);
}
.hero-deco-center {
  position: absolute;
  inset: 200px;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-grad);
  opacity: 0.12;
}

/* ── Services ────────────────────────────────── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.service-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px;
  transition: all var(--dur) var(--ease);
  position: relative;
}
.service-card:hover {
  background: var(--bg-3);
  border-color: var(--accent-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.service-card h3 {
  margin: 16px 0 8px;
}
.service-card p {
  font-size: 0.875rem;
}

/* ── Projects ────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}
.project-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--dur) var(--ease);
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.project-thumb {
  height: 160px;
  background: var(--bg-3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 2rem;
  border-bottom: 1px solid var(--line);
}
.project-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.project-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.project-body h3 {
  margin-bottom: 8px;
}
.project-body p {
  font-size: 0.875rem;
  flex: 1;
  margin-bottom: 18px;
}
.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.project-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #22c55e;
}
.project-status .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: blink 2s ease infinite;
}
@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* ── Process ─────────────────────────────────── */
.process-list {
  display: flex;
  flex-direction: column;
  max-width: 660px;
  margin: 0 auto;
}
.process-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.process-item:last-child {
  border-bottom: none;
}
.process-num {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  padding-top: 4px;
}
.process-item h3 {
  margin-bottom: 6px;
  font-size: 0.975rem;
}
.process-item p {
  font-size: 0.875rem;
}

/* ── Features ────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 540px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}
.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  text-align: left;
  padding: 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--bg-3);
  transition: all var(--dur) var(--ease);
}
.feature-item:hover {
  border-color: var(--accent-border);
  background: var(--bg-4);
}
.feature-text {
  flex: 1;
  min-width: 0;
}
.feature-text h4 {
  margin-bottom: 4px;
}
.feature-text p {
  font-size: 0.85rem;
  margin: 0;
}

/* ── Tech grid ───────────────────────────────── */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 10px;
}
.tech-item {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px 12px;
  text-align: center;
  transition: all var(--dur) var(--ease);
}
.tech-item:hover {
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}
.tech-item i {
  display: block;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.tech-item span {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-2);
}

/* ── CTA band ────────────────────────────────── */
.cta-band {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 88px 0;
  text-align: center;
}
.cta-band h2 {
  margin-bottom: 12px;
}
.cta-band > .container > p {
  max-width: 460px;
  margin: 0 auto 32px;
  font-size: 0.975rem;
}
.cta-btns {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Why Us section ──────────────────────────── */
.why-section {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ── Contact ─────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 64px;
  align-items: start;
}
.contact-info h2 {
  margin-bottom: 12px;
}
.contact-info > p {
  margin-bottom: 40px;
}
.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 3px;
}
.contact-val {
  font-size: 0.875rem;
  color: var(--text-2);
}
.contact-val a {
  color: var(--text-2);
}
.contact-val a:hover {
  color: var(--accent);
}

/* ── Form ────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-3);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 11px 14px;
  color: var(--text-1);
  font-size: 0.875rem;
  font-family: inherit;
  transition: all var(--dur) var(--ease);
  outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-3);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: var(--bg-2);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}
.form-group textarea {
  resize: vertical;
  min-height: 128px;
}

/* ── Footer ──────────────────────────────────── */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  margin-top: 14px;
  font-size: 0.84rem;
  line-height: 1.7;
  max-width: 256px;
}
.footer-col h5 {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-bottom: 16px;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: var(--text-3);
  font-size: 0.85rem;
  transition: color var(--dur) var(--ease);
}
.footer-links a:hover {
  color: var(--text-1);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom p {
  font-size: 0.78rem;
  color: var(--text-3);
}
.footer-bottom-links {
  display: flex;
  gap: 20px;
}
.footer-bottom-links a {
  color: var(--text-3);
  font-size: 0.78rem;
}
.footer-bottom-links a:hover {
  color: var(--text-1);
}

/* ── Page header ─────────────────────────────── */
.page-header {
  padding: 130px 0 72px;
  border-bottom: 1px solid var(--line);
}
.page-header h1 {
  margin-bottom: 12px;
}
.page-header > .container > p {
  max-width: 520px;
  font-size: 1rem;
}

/* ── About ───────────────────────────────────── */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-visual {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-visual i {
  font-size: 3.5rem;
  color: var(--accent);
  opacity: 0.5;
}
.mission-block {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: 20px 24px;
  margin-top: 28px;
}
.mission-block h4 {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}
.mission-block p {
  font-size: 0.9rem;
  font-style: italic;
}
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.value-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px;
}
.value-card h4 {
  margin: 10px 0 6px;
}
.value-card p {
  font-size: 0.84rem;
}

/* ── Filter bar ──────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}
.filter-btn {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--text-2);
  padding: 7px 18px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  font-family: inherit;
}
.filter-btn:hover {
  border-color: var(--accent-border);
  color: var(--accent);
}
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Project detail ──────────────────────────── */
.project-detail {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  margin-bottom: 20px;
  transition: border-color var(--dur) var(--ease);
}
.project-detail:hover {
  border-color: var(--line-strong);
}
.project-detail-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.project-detail-visual {
  background: var(--bg-3);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  border-right: 1px solid var(--line);
  padding: 40px;
}
.project-detail-visual i {
  font-size: 3rem;
  color: var(--accent);
}
.project-detail-visual .app-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-2);
}
.project-detail-info {
  padding: 40px;
}
.project-detail-info h2 {
  margin: 10px 0 12px;
  font-size: 1.6rem;
}
.project-detail-info > p {
  font-size: 0.875rem;
  margin-bottom: 24px;
}
.project-detail-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.meta-block h5 {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 10px;
  font-weight: 700;
}
.meta-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.project-detail-body {
  padding: 0 40px 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  border-top: 1px solid var(--line);
}
.feature-list-section h5 {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  font-weight: 700;
  padding: 24px 0 14px;
}
.feature-list {
  list-style: none;
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--text-2);
}
.feature-list li:last-child {
  border-bottom: none;
}
.feature-list li i {
  color: var(--accent);
  font-size: 0.75rem;
  margin-top: 3px;
  flex-shrink: 0;
}
.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

/* ── Service detail ──────────────────────────── */
.service-detail-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 40px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 28px;
  align-items: start;
  transition: all var(--dur) var(--ease);
}
.service-detail-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}
.service-detail-card h3 {
  margin-bottom: 10px;
}
.service-detail-card > div > p {
  margin-bottom: 18px;
  font-size: 0.875rem;
}
.svc-bullets {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 7px;
}
.svc-bullets li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-2);
}
.svc-bullets li i {
  color: var(--accent);
  font-size: 0.68rem;
  flex-shrink: 0;
}

/* ── Toast ───────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-3);
  border: 1px solid var(--line-strong);
  color: var(--text-1);
  padding: 11px 18px;
  border-radius: var(--r-md);
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.26s var(--ease);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-md);
}
#toast i {
  color: #22c55e;
}
#toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Legal ───────────────────────────────────── */
.legal-body {
  max-width: 720px;
}
.legal-body h2 {
  font-size: 1.15rem;
  margin: 40px 0 12px;
}
.legal-body h3 {
  font-size: 0.975rem;
  margin: 22px 0 8px;
}
.legal-body p {
  margin-bottom: 14px;
  font-size: 0.925rem;
}
.legal-body ul {
  padding-left: 20px;
  margin-bottom: 14px;
}
.legal-body ul li {
  color: var(--text-2);
  font-size: 0.925rem;
  margin-bottom: 5px;
}
.legal-body a {
  color: var(--accent);
}
.legal-updated {
  color: var(--text-3);
  font-size: 0.8rem;
  margin-bottom: 36px;
}

/* ── Animations ──────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.5s var(--ease),
    transform 0.5s var(--ease);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up:nth-child(1) {
  transition-delay: 0ms;
}
.fade-up:nth-child(2) {
  transition-delay: 75ms;
}
.fade-up:nth-child(3) {
  transition-delay: 150ms;
}
.fade-up:nth-child(4) {
  transition-delay: 225ms;
}
.fade-up:nth-child(5) {
  transition-delay: 300ms;
}
.fade-up:nth-child(6) {
  transition-delay: 375ms;
}

/* ── Scrollbar ───────────────────────────────── */
::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--bg-4);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-3);
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .about-intro {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .about-visual {
    max-width: 360px;
    margin: 0 auto;
  }
  .hero-deco {
    display: none;
  }
  .project-detail-header {
    grid-template-columns: 1fr;
  }
  .project-detail-visual {
    border-right: none;
    border-bottom: 1px solid var(--line);
    min-height: 160px;
  }
  .project-detail-body {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 12px;
    gap: 2px;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 11px 14px;
    font-size: 0.925rem;
    width: 100%;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-right .lang-switcher {
    display: none;
  }
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .values-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .section {
    padding: 72px 0;
  }
  .page-header {
    padding: 110px 0 56px;
  }
  .service-detail-card {
    grid-template-columns: 1fr;
    padding: 28px;
    gap: 18px;
  }
  .project-detail-info {
    padding: 28px;
  }
  .project-detail-body {
    padding: 0 28px 28px;
  }
}
@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }
  .btn-lg {
    width: 100%;
  }
  .cta-btns {
    flex-direction: column;
    align-items: center;
  }
  .hero-stats {
    gap: 28px;
  }
}