/* ===== GitHub Primer-inspired Theme ===== */
:root {
  /* Dark mode (default) — GitHub homepage navy + glow */
  --canvas-default: #0a0d16;
  --canvas-subtle: #0d1117;
  --canvas-inset: #050810;
  --canvas-overlay: #161b22;
  --border-default: #2a3142;
  --border-muted: #1c2230;
  --fg-default: #e6edf3;
  --fg-muted: #8b949e;
  --fg-subtle: #6e7681;
  --fg-on-emphasis: #ffffff;
  --accent-fg: #7c8cff;
  --accent-emphasis: #5468ff;
  --accent-muted: rgba(124, 140, 255, 0.4);
  --accent-subtle: rgba(124, 140, 255, 0.12);
  --glow-purple: rgba(139, 92, 246, 0.35);
  --glow-blue: rgba(59, 130, 246, 0.3);
  --glow-pink: rgba(236, 72, 153, 0.2);
  --success-fg: #3fb950;
  --success-emphasis: #238636;
  --success-emphasis-hover: #2ea043;
  --danger-fg: #f85149;
  --danger-subtle: rgba(248, 81, 73, 0.1);
  --btn-bg: #21262d;
  --btn-border: rgba(240, 246, 252, 0.1);
  --btn-hover-bg: #30363d;
  --btn-hover-border: #8b949e;
  --shadow-small: 0 0 transparent;
  --shadow-medium: 0 3px 6px rgba(140, 149, 159, 0.15);
  --glow-frame: 0 0 0 1px rgba(124, 140, 255, 0.15), 0 0 60px -10px rgba(139, 92, 246, 0.35), 0 0 120px -20px rgba(59, 130, 246, 0.25);
  --glow-frame-hover: 0 0 0 1px rgba(124, 140, 255, 0.3), 0 0 80px -10px rgba(139, 92, 246, 0.5), 0 0 160px -20px rgba(59, 130, 246, 0.35);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max-width: 1280px;
  --radius: 6px;
}

/* ===== Light Theme — GitHub light ===== */
[data-theme="light"] {
  --canvas-default: #ffffff;
  --canvas-subtle: #f6f8fa;
  --canvas-inset: #f6f8fa;
  --canvas-overlay: #ffffff;
  --border-default: #d0d7de;
  --border-muted: #d8dee4;
  --fg-default: #1f2328;
  --fg-muted: #656d76;
  --fg-subtle: #6e7781;
  --fg-on-emphasis: #ffffff;
  --accent-fg: #0969da;
  --accent-emphasis: #0969da;
  --accent-muted: rgba(84, 174, 255, 0.4);
  --accent-subtle: #ddf4ff;
  --success-fg: #1a7f37;
  --success-emphasis: #1f883d;
  --success-emphasis-hover: #1a7f37;
  --danger-fg: #cf222e;
  --danger-subtle: #ffebe9;
  --btn-bg: #f6f8fa;
  --btn-border: rgba(31, 35, 40, 0.15);
  --btn-hover-bg: #f3f4f6;
  --btn-hover-border: rgba(31, 35, 40, 0.15);
  --shadow-small: 0 1px 0 rgba(31, 35, 40, 0.04);
  --shadow-medium: 0 3px 6px rgba(140, 149, 159, 0.15);
  --glow-frame: 0 0 0 1px rgba(9, 105, 218, 0.15), 0 8px 24px rgba(140, 149, 159, 0.2);
  --glow-frame-hover: 0 0 0 1px rgba(9, 105, 218, 0.3), 0 12px 32px rgba(140, 149, 159, 0.25);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 5px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-default);
  transition: background 0.2s, border-color 0.2s;
  box-shadow: var(--shadow-small);
}

.theme-toggle:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 16px;
  height: 16px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font);
  color: var(--fg-default);
  background: var(--canvas-default);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 14px;
  background-image:
    radial-gradient(ellipse 800px 600px at 15% 10%, rgba(139, 92, 246, 0.08), transparent 60%),
    radial-gradient(ellipse 800px 600px at 85% 30%, rgba(59, 130, 246, 0.07), transparent 60%),
    radial-gradient(ellipse 600px 500px at 50% 80%, rgba(236, 72, 153, 0.05), transparent 60%);
  background-attachment: fixed;
}

[data-theme="light"] body {
  background-image: none;
}

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

a {
  color: var(--accent-fg);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--canvas-inset);
  border-bottom: 1px solid var(--border-default);
}

[data-theme="light"] .header {
  background: #24292f;
  border-bottom-color: #24292f;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.logo {
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: -0.2px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.logo span {
  color: var(--accent-fg);
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 8px;
  border-radius: var(--radius);
  transition: color 0.15s;
}

.nav a:hover {
  color: #ffffff;
  text-decoration: none;
}

.nav a.btn {
  color: #ffffff;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 2px;
}

/* ===== Buttons (Primer-style) ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--success-emphasis);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font);
  border: 1px solid rgba(240, 246, 252, 0.1);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  line-height: 20px;
  white-space: nowrap;
  box-shadow: var(--shadow-small);
}

.btn:hover {
  background: var(--success-emphasis-hover);
  color: #ffffff;
  text-decoration: none;
  border-color: rgba(240, 246, 252, 0.1);
}

.btn-sm {
  padding: 5px 16px;
  font-size: 0.8125rem;
}

/* Header CTA — green primary */
.nav a.btn {
  background: var(--success-emphasis);
  border: 1px solid rgba(240, 246, 252, 0.1);
  color: #ffffff;
}

.nav a.btn:hover {
  background: var(--success-emphasis-hover);
  border-color: rgba(240, 246, 252, 0.1);
  color: #ffffff;
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: transparent;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--glow-purple), transparent 60%),
    radial-gradient(ellipse 40% 30% at 50% 100%, var(--glow-blue), transparent 60%);
  pointer-events: none;
  filter: blur(40px);
}

[data-theme="light"] .hero::before {
  display: none;
}

.hero .container {
  position: relative;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--fg-default);
  line-height: 1.15;
  max-width: 900px;
  margin: 0 auto 20px;
  letter-spacing: -1px;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.55;
}

/* ===== Sections (shared) ===== */
section {
  padding: 80px 0;
  position: relative;
}

[data-theme="light"] section {
  border-bottom: 1px solid var(--border-default);
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--fg-default);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.section-sub {
  color: var(--fg-muted);
  font-size: 1rem;
  max-width: 600px;
  margin-bottom: 40px;
}

/* ===== Pain Points ===== */
.pain {
  background: transparent;
}

.pain-grid {
  display: grid;
  gap: 16px;
}

.pain-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
  box-shadow: var(--glow-frame);
}

.pain-item:hover {
  border-color: var(--accent-muted);
  box-shadow: var(--glow-frame-hover);
  transform: translateY(-2px);
}

[data-theme="light"] .pain-item {
  background: var(--canvas-default);
  backdrop-filter: none;
}

.pain-side {
  padding: 24px 28px;
  position: relative;
}

.pain-side.problem {
  background: var(--danger-subtle);
  border-right: 1px solid var(--border-default);
}

.pain-side.solution {
  background: var(--accent-subtle);
}

.pain-label {
  display: inline-flex;
  align-items: center;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  margin-bottom: 10px;
  padding: 2px 8px;
  border-radius: 2em;
  border: 1px solid;
  line-height: 18px;
}

.pain-side.problem .pain-label {
  color: var(--danger-fg);
  border-color: var(--danger-fg);
  background: transparent;
}

.pain-side.solution .pain-label {
  color: var(--accent-fg);
  border-color: var(--accent-muted);
  background: transparent;
}

.pain-side p {
  color: var(--fg-default);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.pain-side.problem p {
  color: var(--fg-muted);
  font-style: italic;
}

/* ===== Services Cards ===== */
.services {
  background: transparent;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
  box-shadow: var(--glow-frame);
}

.card:hover {
  border-color: var(--accent-muted);
  box-shadow: var(--glow-frame-hover);
  transform: translateY(-3px);
}

[data-theme="light"] .card {
  background: var(--canvas-default);
  backdrop-filter: none;
}

.card-icon {
  color: var(--accent-fg);
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--accent-subtle);
  border-radius: var(--radius);
  border: 1px solid var(--accent-muted);
}

.card-icon svg {
  width: 22px;
  height: 22px;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--fg-default);
  margin-bottom: 8px;
}

.card p {
  color: var(--fg-muted);
  font-size: 0.875rem;
  line-height: 1.55;
}

/* ===== How We Work ===== */
.how {
  background: transparent;
}

.how-block {
  margin-bottom: 24px;
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 28px 32px;
  box-shadow: var(--glow-frame);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.how-block:hover {
  border-color: var(--accent-muted);
  box-shadow: var(--glow-frame-hover);
}

[data-theme="light"] .how-block {
  background: var(--canvas-default);
  backdrop-filter: none;
}

.how-block:last-child {
  margin-bottom: 0;
}

.how-block h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--fg-default);
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-muted);
}

.how-block > p {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.how-block ul {
  list-style: none;
  display: grid;
  gap: 10px;
}

.how-block li {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.55;
  padding-left: 20px;
  position: relative;
}

.how-block li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success-fg);
}

.how-block li strong {
  color: var(--fg-default);
  font-weight: 600;
}

/* ===== Why / Differentiators ===== */
.why {
  background: transparent;
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.diff-item {
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 24px 28px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
  box-shadow: var(--glow-frame);
}

.diff-item:hover {
  border-color: var(--accent-muted);
  box-shadow: var(--glow-frame-hover);
  transform: translateY(-2px);
}

[data-theme="light"] .diff-item {
  background: var(--canvas-default);
  backdrop-filter: none;
}

.diff-item h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--fg-default);
  margin-bottom: 6px;
}

.diff-item h3::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--success-fg);
  border-radius: 2px;
  margin-bottom: 12px;
}

.diff-item p {
  color: var(--fg-muted);
  font-size: 0.875rem;
  line-height: 1.55;
}

/* ===== About ===== */
.about {
  background: transparent;
}

.about .container {
  text-align: center;
}

.about h2 {
  margin-left: auto;
  margin-right: auto;
}

.about-text {
  max-width: 720px;
  margin: 0 auto;
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 36px 40px;
  text-align: left;
  box-shadow: var(--glow-frame);
}

[data-theme="light"] .about-text {
  background: var(--canvas-default);
  backdrop-filter: none;
}

.about-text p {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-bottom: 14px;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-text strong {
  color: var(--fg-default);
  font-weight: 600;
}

/* ===== Contact ===== */
.contact {
  background: transparent;
}

.contact .container {
  text-align: center;
}

.contact h2,
.contact .section-sub {
  margin-left: auto;
  margin-right: auto;
}

.contact-form {
  max-width: 640px;
  margin: 0 auto 24px;
  text-align: left;
  background: rgba(13, 17, 23, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  padding: 32px 36px;
  box-shadow: var(--glow-frame);
}

[data-theme="light"] .contact-form {
  background: var(--canvas-subtle);
  backdrop-filter: none;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--fg-default);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 5px 12px;
  background: var(--canvas-default);
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  color: var(--fg-default);
  font-family: var(--font);
  font-size: 0.875rem;
  line-height: 20px;
  min-height: 32px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group textarea {
  padding: 8px 12px;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-fg);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.contact-alt {
  color: var(--fg-muted);
  font-size: 0.875rem;
  margin-bottom: 4px;
}

.contact-location {
  color: var(--fg-subtle);
  font-size: 0.8125rem;
}

/* ===== Footer ===== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-default);
  background: var(--canvas-inset);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer p {
  color: var(--fg-muted);
  font-size: 0.75rem;
}

.footer-link a {
  color: var(--fg-muted);
}

.footer-link a:hover {
  color: var(--accent-fg);
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--canvas-inset);
    border-bottom: 1px solid var(--border-default);
    padding: 16px;
    gap: 4px;
  }

  .nav.open {
    display: flex;
  }

  .hero {
    padding: 120px 0 64px;
  }

  section {
    padding: 64px 0;
  }

  .card-grid,
  .diff-grid {
    grid-template-columns: 1fr;
  }

  .pain-item {
    grid-template-columns: 1fr;
  }

  .pain-side.problem {
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 1024px) and (min-width: 769px) {
  .card-grid {
    grid-template-columns: 1fr 1fr;
  }

  .diff-grid {
    grid-template-columns: 1fr 1fr;
  }
}