/* ===================================
   wiredhiro-dev - Main Stylesheet
   Modern / Minimal / Monotone
   =================================== */

/* --- CSS Variables --- */
:root {
  --color-black: #111;
  --color-dark: #333;
  --color-gray: #666;
  --color-light-gray: #999;
  --color-border: #e0e0e0;
  --color-bg: #fafafa;
  --color-white: #fff;

  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-dark);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

a:hover {
  opacity: 0.7;
}

ul {
  list-style: none;
}

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

/* --- Layout --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===================================
   Header
   =================================== */
.header {
  background-color: var(--color-white);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-black);
}

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

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-gray);
  padding: 8px 0;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-black);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-black);
  opacity: 1;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.btn-contact {
  background-color: var(--color-black);
  color: var(--color-white) !important;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
}

.btn-contact::after {
  display: none;
}

.btn-contact:hover {
  background-color: var(--color-dark);
  opacity: 1;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

/* Mobile Navigation */
.nav.active {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  z-index: 99;
}

.nav.active .nav-list {
  flex-direction: column;
  gap: 0;
  padding: 16px 24px;
}

.nav.active .nav-link {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.nav.active .nav-link:last-child {
  border-bottom: none;
}

.nav.active .btn-contact {
  display: inline-block;
  margin-top: 8px;
  text-align: center;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  padding: 100px 0 120px;
  background-color: var(--color-white);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-subtitle {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-light-gray);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--color-black);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 17px;
  color: var(--color-gray);
  line-height: 1.8;
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
}

.hero-image .placeholder-image {
  height: 400px;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-gray);
  font-size: 14px;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--color-black);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-dark);
  opacity: 1;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-dark);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg);
  border-color: var(--color-dark);
  opacity: 1;
}

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

.btn-outline:hover {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
  opacity: 1;
}

.btn-large {
  padding: 18px 36px;
  font-size: 15px;
}

/* ===================================
   Section Common
   =================================== */
section {
  padding: 100px 0;
  scroll-margin-top: 80px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.5px;
  color: var(--color-black);
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--color-light-gray);
  text-align: center;
  margin-bottom: 60px;
}

.section-cta {
  text-align: center;
  margin-top: 48px;
}

/* ===================================
   Portfolio Preview
   =================================== */
.portfolio-preview {
  background-color: var(--color-bg);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

a.portfolio-card {
  display: block;
  text-decoration: none;
  color: inherit;
}

.portfolio-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.portfolio-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  opacity: 1;
}

.portfolio-image {
  height: 200px;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-gray);
  font-size: 14px;
  overflow: hidden;
}

.portfolio-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.portfolio-info {
  padding: 24px;
}

.portfolio-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-black);
}

.portfolio-tech {
  font-size: 12px;
  color: var(--color-light-gray);
  line-height: 1.6;
}

/* ===================================
   Skills Overview
   =================================== */
.skills-overview {
  background-color: var(--color-white);
}

.skills-categories {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.skill-category {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px;
}

.skill-category-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-light-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  background-color: var(--color-white);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-dark);
  border-radius: var(--radius-sm);
}

/* ===================================
   About Preview
   =================================== */
.about-preview {
  background-color: var(--color-bg);
}

.about-inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 80px;
  align-items: center;
}

.about-image img {
  width: 280px;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.about-image .placeholder-image {
  width: 280px;
  height: 280px;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-gray);
  font-size: 14px;
}

.about-content .section-title,
.about-content .section-subtitle {
  text-align: left;
}

.about-content .section-subtitle {
  margin-bottom: 24px;
}

.about-name {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 4px;
}

.about-role {
  font-size: 14px;
  color: var(--color-light-gray);
  margin-bottom: 24px;
}

.about-description {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.9;
}

/* ===================================
   Blog Preview
   =================================== */
.blog-preview {
  background-color: var(--color-white);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.blog-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

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

.blog-image {
  height: 160px;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light-gray);
  font-size: 14px;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog-info {
  padding: 24px;
}

.blog-date {
  font-size: 12px;
  color: var(--color-light-gray);
}

.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.blog-tag {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-gray);
  background-color: var(--color-bg);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.blog-title {
  font-size: 16px;
  font-weight: 600;
  margin: 12px 0;
  line-height: 1.5;
  color: var(--color-black);
}

.blog-excerpt {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.7;
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
  background-color: var(--color-black);
  color: var(--color-white);
  text-align: center;
  padding: 100px 0;
}

.cta-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-description {
  font-size: 16px;
  opacity: 0.8;
  margin-bottom: 40px;
  line-height: 1.8;
}

.cta-section .btn-primary {
  background-color: var(--color-white);
  color: var(--color-black);
}

.cta-section .btn-primary:hover {
  background-color: var(--color-bg);
  opacity: 1;
}

/* ===================================
   Footer
   =================================== */
.footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 60px 0 40px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-nav {
  display: flex;
  justify-content: center;
}

.footer-nav-list {
  display: flex;
  gap: 32px;
}

.footer-nav-list a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-nav-list a:hover {
  color: var(--color-white);
  opacity: 1;
}

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

.social-link {
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: rgba(255, 255, 255, 0.5);
  transition: var(--transition);
}

.social-link:hover {
  border-color: var(--color-white);
  color: var(--color-white);
  opacity: 1;
}

.footer-bottom {
  padding-top: 32px;
  text-align: center;
}

.copyright {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 1024px) {
  .skills-categories {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 60px 0 80px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-cta {
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero-image {
    order: -1;
  }

  .hero-image .placeholder-image {
    height: 280px;
  }

  section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .portfolio-grid,
  .blog-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .skills-categories {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .about-image {
    order: -1;
  }

  .about-image img {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    display: block;
  }

  .about-image .placeholder-image {
    width: 200px;
    height: 200px;
    margin: 0 auto;
  }

  .about-content .section-title,
  .about-content .section-subtitle {
    text-align: center;
  }

  .footer-main {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 24px;
  }

  .social-links {
    justify-content: center;
  }
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background-color: var(--color-black);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
  box-shadow: var(--shadow-md);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-dark);
  transform: translateY(-4px);
}

.back-to-top.on-footer {
  background-color: var(--color-white);
  color: var(--color-black);
}

.back-to-top.on-footer:hover {
  background-color: var(--color-bg);
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}