/* hanasobi.com — Design System
   Monochrome + Teal Accent (#00d2be)
   Dark theme, editorial layout */

:root {
  --bg: #0a0a0a;
  --text-100: rgba(255, 255, 255, 1);
  --text-65: rgba(255, 255, 255, 0.65);
  --text-55: rgba(255, 255, 255, 0.55);
  --text-45: rgba(255, 255, 255, 0.45);
  --text-35: rgba(255, 255, 255, 0.35);
  --text-30: rgba(255, 255, 255, 0.3);
  --text-25: rgba(255, 255, 255, 0.25);
  --text-20: rgba(255, 255, 255, 0.2);
  --text-15: rgba(255, 255, 255, 0.15);
  --text-10: rgba(255, 255, 255, 0.1);
  --text-08: rgba(255, 255, 255, 0.08);
  --text-06: rgba(255, 255, 255, 0.06);
  --text-04: rgba(255, 255, 255, 0.04);
  --text-03: rgba(255, 255, 255, 0.03);

  --teal: #00d2be;
  --teal-55: rgba(0, 210, 190, 0.55);
  --teal-45: rgba(0, 210, 190, 0.45);
  --teal-40: rgba(0, 210, 190, 0.4);
  --teal-35: rgba(0, 210, 190, 0.35);
  --teal-20: rgba(0, 210, 190, 0.2);
  --teal-12: rgba(0, 210, 190, 0.12);
  --teal-10: rgba(0, 210, 190, 0.1);
  --teal-05: rgba(0, 210, 190, 0.05);
  --teal-03: rgba(0, 210, 190, 0.03);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 800px;
  --padding-x: 40px;
}

@media (max-width: 640px) {
  :root {
    --padding-x: 24px;
  }
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

::selection {
  background: rgba(0, 210, 190, 0.2);
  color: var(--text-100);
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-35);
  line-height: 1.7;
}

/* Typography */
h1, h2, h3 {
  color: var(--text-100);
  font-weight: 500;
  line-height: 1.35;
}

h1 { font-size: 2rem; letter-spacing: -0.3px; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1rem; font-weight: 500; }

a {
  color: inherit;
  text-decoration: none;
}

/* Layout */
.wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-x);
}

/* Section */
.section {
  padding: 56px 0;
  border-top: 0.5px solid var(--text-04);
}

.section:first-of-type {
  border-top: none;
}

.section-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--teal-55);
  margin-bottom: 12px;
}

/* Nav */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px var(--padding-x);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-100);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 0.6875rem;
  color: var(--text-55);
  align-items: center;
}

.nav-links a:hover {
  color: var(--text-100);
}

.nav-contact {
  color: var(--text-100);
  background: var(--teal-10);
  border: 0.5px solid var(--teal-20);
  padding: 4px 12px;
  border-radius: 20px;
  margin-left: 4px;
  font-size: 0.625rem;
  transition: background 0.2s;
}

.nav-contact:hover {
  background: var(--teal-20);
}

.nav-lang {
  margin-left: 4px;
}

.nav-lang-active {
  color: var(--text-100);
}

.nav-lang-inactive {
  color: var(--text-25);
}

@media (max-width: 640px) {
  .nav-links {
    gap: 16px;
  }
}

/* Hero */
.hero {
  padding: 80px 0 72px;
}

.hero-inner {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.hero-content {
  flex: 1;
}

.hero-tagline {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--teal-55);
  margin-bottom: 20px;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero-description {
  font-size: 0.9375rem;
  color: var(--text-40, rgba(255,255,255,0.4));
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--teal-03);
  border: 0.5px solid var(--teal-10);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 40px;
  overflow: hidden;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 640px) {
  .hero-inner {
    flex-direction: column-reverse;
    gap: 24px;
    align-items: center;
    text-align: center;
  }

  .hero-photo {
    margin-top: 0;
  }

  .hero-description {
    max-width: none;
  }
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--teal);
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--bg);
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-primary .arrow {
  opacity: 0.5;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: transparent;
  border: 0.5px solid var(--text-12, rgba(255,255,255,0.12));
  border-radius: 6px;
  font-size: 0.8125rem;
  color: var(--text-55);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  border-color: var(--text-25);
  color: var(--text-100);
}

/* Problem Section */
.problem-lead {
  font-size: 1.0625rem;
  color: var(--text-65);
  line-height: 1.8;
  margin-bottom: 16px;
  font-weight: 400;
}

.problem-detail {
  font-size: 0.875rem;
  color: var(--text-40, rgba(255,255,255,0.4));
  line-height: 1.8;
  margin-bottom: 16px;
}

.problem-conclusion {
  font-size: 0.875rem;
  color: var(--text-55);
}

/* Approach (numbered) */
.approach-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.approach-number {
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--teal-35);
  line-height: 1;
  flex-shrink: 0;
  width: 32px;
}

.approach-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-100);
  margin-bottom: 6px;
}

.approach-text {
  font-size: 0.8125rem;
  color: var(--text-45);
  line-height: 1.7;
}

/* Services */
.service-row {
  padding: 20px 0;
  border-top: 0.5px solid var(--text-06);
}

.service-row-split {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.service-label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-100);
  min-width: 140px;
  flex-shrink: 0;
}

.service-desc {
  font-size: 0.8125rem;
  color: var(--text-45);
  line-height: 1.7;
}

/* RAG highlight */
.service-rag {
  padding: 24px 0;
  border-top: 0.5px solid var(--text-06);
}

.service-rag-inner {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.service-rag-accent {
  width: 3px;
  background: var(--teal-55);
  border-radius: 2px;
  align-self: stretch;
  flex-shrink: 0;
}

.service-rag-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-100);
  margin-bottom: 6px;
}

.service-rag-text {
  font-size: 0.8125rem;
  color: var(--text-45);
  line-height: 1.7;
  margin-bottom: 16px;
}

.tag-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.625rem;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--teal-05);
  color: var(--teal-55);
  border: 0.5px solid var(--teal-35);
}

@media (max-width: 640px) {
  .service-row-split {
    flex-direction: column;
    gap: 6px;
  }

  .service-label {
    min-width: unset;
  }
}

/* Background */
.background-text {
  font-size: 0.875rem;
  color: var(--text-45);
  line-height: 1.8;
}

/* Portfolio */
.portfolio-row {
  padding: 20px 0;
  border-top: 0.5px solid var(--text-06);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.portfolio-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-100);
  margin-bottom: 4px;
}

.portfolio-meta {
  font-size: 0.75rem;
  color: var(--text-45);
}

.portfolio-tag {
  font-size: 0.625rem;
  color: var(--text-35);
  flex-shrink: 0;
  padding-top: 4px;
}

.oss-sublabel {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-25);
  margin-bottom: 16px;
}

.oss-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1px;
  background: var(--text-04);
  border-radius: 8px;
  overflow: hidden;
}

.oss-item {
  background: var(--bg);
  padding: 16px;
}

.oss-item-title {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-100);
  margin-bottom: 4px;
}

.oss-item-link {
  font-size: 0.6875rem;
  color: var(--teal-45);
  transition: color 0.2s;
}

.oss-item-link:hover {
  color: var(--teal);
}

@media (max-width: 640px) {
  .oss-grid {
    grid-template-columns: 1fr;
  }

  .portfolio-row {
    flex-direction: column;
    gap: 4px;
  }
}

/* Certifications */
.certs {
  padding: 40px 0;
  border-top: 0.5px solid var(--text-04);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.certs-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-25);
}

.certs-badges {
  display: flex;
  gap: 20px;
  align-items: center;
}

.certs-badge {
  display: block;
  transition: opacity 0.2s;
}

.certs-badge:hover {
  opacity: 0.8;
}

.certs-badge img {
  height: 72px;
  width: auto;
}

/* Focus styles for accessibility */
a:focus-visible {
  outline: 2px solid var(--teal-40);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Blog Teaser */
.blog-row {
  padding: 16px 0;
  border-top: 0.5px solid var(--text-04);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: padding-left 0.2s;
}

.blog-row:hover {
  padding-left: 4px;
}

.blog-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-100);
  margin-bottom: 2px;
}

.blog-date {
  font-size: 0.625rem;
  color: var(--text-35);
}

.blog-arrow {
  font-size: 0.75rem;
  color: var(--teal-40);
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 64px 0;
}

.cta-section h2 {
  margin-bottom: 12px;
}

.cta-section p {
  font-size: 0.875rem;
  color: var(--text-45);
  margin-bottom: 32px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  align-items: center;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  background: transparent;
  border: 0.5px solid var(--text-06);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-45);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.btn-copy:hover {
  color: var(--text-65);
  border-color: var(--text-15);
}

.btn-copy.copied {
  color: var(--teal);
  border-color: var(--teal-35);
}

@media (max-width: 640px) {
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* Footer */
.footer {
  padding: 20px 0;
  border-top: 0.5px solid var(--text-03);
  text-align: center;
}

.footer p {
  font-size: 0.625rem;
  color: var(--text-15);
}