/*
Theme Name: Yang Portfolio
Theme URI: https://yangyang-dev.com
Author: Yang Yang
Author URI: https://yangyang-dev.com
Description: AI × Web × Business Automation Engineer Portfolio
Version: 1.0.0
Requires at least: 6.0
Tested up to: 7.0
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: yang-portfolio
*/

:root {
  --color-bg: #0f0f1a;
  --color-bg-card: #1a1a2e;
  --color-bg-card-hover: #22223a;
  --color-accent: #4a90d9;
  --color-accent-hover: #5ba0e9;
  --color-text: #f0f0f0;
  --color-text-muted: #a0a0b0;
  --color-border: #2a2a3e;
  --color-tag-bg: #2a2a3e;
  --color-tag-text: #8ab4f8;
  --font-main: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent-hover);
}

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

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

/* ========== Header / Navigation ========== */

.admin-bar .site-header {
  top: 32px;
}

@media (max-width: 782px) {
  .admin-bar .site-header {
    top: 46px;
  }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.site-logo span {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: 32px;
  list-style: none;
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========== Hero ========== */

.hero {
  padding: 160px 0 80px;
  text-align: center;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-title .accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========== Numbers ========== */

.numbers {
  padding: 40px 0 80px;
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.number-item .number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
}

.number-item .label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ========== Section Common ========== */

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  text-align: center;
}

.section-title .accent {
  color: var(--color-accent);
}

/* ========== Services ========== */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: all 0.3s;
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.service-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ========== Projects ========== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.project-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--color-bg-card-hover);
}

.project-info {
  padding: 20px;
}

.project-info h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-info p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  font-size: 0.85rem;
  font-weight: 500;
}

/* ========== Skills ========== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.skill-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}

.skill-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.skill-years {
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 600;
}

.skill-uses {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.skill-uses span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.skill-uses span::before {
  content: "✔ ";
  color: var(--color-accent);
}

.skill-projects {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ========== Process ========== */

.process-flow {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 40px 0;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.process-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.process-step .step-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 80px;
}

.process-step.highlight .process-circle {
  background: var(--color-accent);
}

.process-arrow {
  color: var(--color-text-muted);
  font-size: 1.2rem;
}

/* ========== About ========== */

.about-content {
  max-width: 720px;
  margin: 0 auto;
}

.about-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--color-accent);
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.about-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
  margin: 20px 0;
  font-size: 1.05rem;
  color: var(--color-text);
  font-style: italic;
}

.about-values {
  list-style: none;
  padding: 0;
}

.about-values li {
  padding: 8px 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.about-values li::before {
  content: "・";
  color: var(--color-accent);
}

/* ========== Contact ========== */

.contact-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.95rem;
  min-width: 280px;
  justify-content: center;
  transition: all 0.2s;
}

.contact-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========== Project Detail ========== */

.project-detail {
  max-width: 860px;
  margin: 0 auto;
}

.project-detail-thumb {
  margin-bottom: 32px;
  border-radius: var(--radius);
  overflow: hidden;
}

.project-detail-thumb img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.project-meta-bar {
  margin-bottom: 32px;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.project-info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.info-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
}

.info-card-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.info-card-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.project-content {
  margin-bottom: 48px;
}

.project-content h2,
.project-content h3 {
  color: var(--color-accent);
  margin-top: 32px;
  margin-bottom: 12px;
}

.project-content h2 {
  font-size: 1.3rem;
}

.project-content h3 {
  font-size: 1.1rem;
}

.project-content ul,
.project-content ol {
  padding-left: 24px;
  color: var(--color-text-muted);
}

.project-content li {
  margin-bottom: 6px;
}

.project-content p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.project-content img {
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

.project-content code {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.project-content pre {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
}

.project-content pre code {
  background: none;
  padding: 0;
}

.project-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

/* ========== Footer ========== */

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ========== Responsive ========== */

@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .numbers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .number-item .number {
    font-size: 2rem;
  }

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

  .site-nav {
    display: none;
  }

  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 26, 0.95);
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: block;
  }

  .process-flow {
    flex-direction: column;
  }

  .process-arrow {
    transform: rotate(90deg);
  }

  .container {
    padding: 0 16px;
  }

  .section {
    padding: 48px 0;
  }
}