/*
Theme Name: Sosuke Sato
Theme URI: https://sato-sosuke.com
Author: Sosuke Sato
Author URI: https://sato-sosuke.com
Description: 佐藤聡介のオフィシャルプロフィールサイト
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.6
Requires PHP: 8.0
License: Private
Text Domain: sosuke-sato
*/

/* ============================================================
   CSS Variables
   ============================================================ */
:root {
  --bg:           #ffffff;
  --bg-alt:       #f4f4f5;
  --bg-dark:      #111827;
  --bg-darker:    #0c111c;
  --text:         #111827;
  --text-muted:   #6b7280;
  --text-light:   #9ca3af;
  --accent:       #dc4c3e;
  --accent-hover: #c43a2d;
  --border:       #e5e7eb;
  --white:        #ffffff;

  --font: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic Medium', 'Yu Gothic', sans-serif;

  --container:  1100px;
  --header-h:   64px;

  --shadow:       0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 40px rgba(0, 0, 0, 0.16);
  --radius:       16px;
  --radius-sm:    10px;
  --transition:   0.25s ease;
}

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

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

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

img { max-width: 100%; height: auto; display: block; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }

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

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

.section-desc {
  margin-top: 16px;
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.transparent {
  background: transparent;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.nav-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.05em;
  transition: color var(--transition);
}

.site-header.scrolled .nav-logo {
  color: var(--text);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition);
  letter-spacing: 0.03em;
}

.nav-menu a:hover { color: var(--white); }

.site-header.scrolled .nav-menu a {
  color: var(--text-muted);
}

.site-header.scrolled .nav-menu a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  color: var(--white);
}

.site-header.scrolled .nav-toggle { color: var(--text); }

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.nav-mobile {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: rgba(17, 24, 39, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.nav-mobile.open { display: flex; }

.nav-mobile a {
  display: block;
  width: 100%;
  text-align: center;
  padding: 20px;
  font-size: 1.25rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: color var(--transition), background var(--transition);
}

.nav-mobile a:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.05);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) 24px 80px;
}

/* Subtle dot grid background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

/* Accent glow */
.hero::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(220, 76, 62, 0.15) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 680px;
}

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 32px;
  background: linear-gradient(135deg, #374151, #1f2937);
  border: 3px solid rgba(255, 255, 255, 0.15);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

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

.hero-name {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.hero-name-en {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.5);
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-tagline {
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  color: rgba(255, 255, 255, 0.65);
  font-weight: 400;
  line-height: 1.8;
  margin-bottom: 40px;
}

.hero-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.75);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.hero-social a:hover {
  background: var(--accent);
  color: var(--white);
  transform: translateY(-3px);
}

.hero-social svg { width: 20px; height: 20px; }

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: bounce 2s infinite;
}

.hero-scroll svg { width: 20px; height: 20px; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%        { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   About
   ============================================================ */
.about {
  padding: 96px 0;
  background: var(--bg);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 64px;
  align-items: center;
}

.about-photo {
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
}

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

.about-text .section-label { text-align: left; }
.about-text .section-title { text-align: left; margin-bottom: 24px; }

.about-body {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.9;
}

.about-body p + p { margin-top: 16px; }

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ============================================================
   Activities
   ============================================================ */
.activities {
  padding: 96px 0;
  background: var(--bg-alt);
}

.activities-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}

.activity-card { grid-column: span 2; }

.activity-card:nth-child(4) { grid-column: 2 / 4; }
.activity-card:nth-child(5) { grid-column: 4 / 6; }

.activity-card-inner {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px 32px;
  height: 100%;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.activity-card:hover .activity-card-inner {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.activity-icon {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: 4px;
}

.activity-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.activity-name-en {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.activity-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 4px;
}

/* ============================================================
   Social / Contact
   ============================================================ */
.social-section {
  padding: 96px 0;
  background: var(--bg);
  text-align: center;
}

.social-links-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.social-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 32px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  min-width: 180px;
}

.social-link-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(220, 76, 62, 0.1);
  transform: translateY(-3px);
}

.social-link-card svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--bg-darker);
  padding: 40px 24px;
  text-align: center;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
}

.footer-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 8px;
}

.footer-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 16px 0;
}

.footer-social a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
}

.footer-social a:hover { color: var(--white); }
.footer-social svg { width: 18px; height: 18px; }

/* ============================================================
   Blog / Single / Archive (basic)
   ============================================================ */
.page-wrap {
  padding-top: var(--header-h);
  min-height: 80vh;
}

.page-hero {
  background: var(--bg-dark);
  padding: 80px 24px 64px;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--white);
}

.page-content {
  padding: 64px 0;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.post-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.post-card-thumb {
  aspect-ratio: 16/9;
  background: var(--bg-alt);
  overflow: hidden;
}

.post-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.post-card:hover .post-card-thumb img { transform: scale(1.04); }

.post-card-body { padding: 24px; }

.post-card-date {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.post-card-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 10px;
}

.post-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Single post */
.single-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px;
}

.single-content .post-meta {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 32px;
}

.single-content h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 24px;
}

.entry-content {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
}

.entry-content p    { margin-bottom: 1.5em; }
.entry-content h2   { font-size: 1.4rem; font-weight: 700; margin: 2.5em 0 1em; }
.entry-content h3   { font-size: 1.2rem; font-weight: 700; margin: 2em 0 0.75em; }
.entry-content ul,
.entry-content ol   { margin: 1em 0 1.5em 1.5em; }
.entry-content li   { margin-bottom: 0.5em; }
.entry-content img  { border-radius: var(--radius-sm); margin: 2em 0; }
.entry-content a    { color: var(--accent); text-decoration: underline; }
.entry-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 1em 1.5em;
  margin: 1.5em 0;
  background: var(--bg-alt);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-photo { max-width: 280px; margin: 0 auto; }

  .activities-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .activity-card,
  .activity-card:nth-child(4),
  .activity-card:nth-child(5) { grid-column: span 1; }
}

@media (max-width: 640px) {
  .nav-menu  { display: none; }
  .nav-toggle { display: flex; }

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

  .social-links-row { flex-direction: column; align-items: stretch; }
  .social-link-card { justify-content: center; min-width: unset; }

  .activity-card-inner { padding: 28px 24px; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2.25rem; }
}