/**
 * Plating Basics Page - 2025 Web Design Trends
 * Educational page - "小学生でもわかるめっきの基礎知識"
 *
 * Design Direction: Educational Elegance with Industrial Precision
 * - Bold bilingual typography
 * - Scroll-driven animations
 * - Dark mode with warm accents
 * - Sticky navigation
 *
 * @package OnePress
 */

/* =========================================
   Google Fonts Import
   ========================================= */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;600;700&display=swap');

/* =========================================
   CSS Custom Properties - 2025 Palette
   ========================================= */
:root {
  /* Core colors - Warm industrial */
  --b25-bg-primary: #0c1220;
  --b25-bg-secondary: #111827;
  --b25-bg-tertiary: #1a2332;
  --b25-bg-card: rgba(255, 255, 255, 0.02);

  /* Accent - Warm cyan/teal */
  --b25-accent-primary: #14b8a6;
  --b25-accent-secondary: #0d9488;
  --b25-accent-light: #5eead4;
  --b25-accent-glow: rgba(20, 184, 166, 0.15);

  /* Text hierarchy */
  --b25-text-primary: #ffffff;
  --b25-text-secondary: rgba(255, 255, 255, 0.75);
  --b25-text-tertiary: rgba(255, 255, 255, 0.5);
  --b25-text-muted: rgba(255, 255, 255, 0.3);

  /* Borders */
  --b25-border-subtle: rgba(255, 255, 255, 0.06);
  --b25-border-light: rgba(255, 255, 255, 0.1);
  --b25-border-accent: rgba(20, 184, 166, 0.3);

  /* Typography */
  --b25-font-display: 'Syne', sans-serif;
  --b25-font-body-jp: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --b25-font-body: 'Noto Sans JP', sans-serif;

  /* Spacing */
  --b25-space-xs: 0.5rem;
  --b25-space-sm: 1rem;
  --b25-space-md: 1.5rem;
  --b25-space-lg: 2.5rem;
  --b25-space-xl: 4rem;
  --b25-space-2xl: 6rem;
  --b25-space-3xl: 10rem;

  /* Container */
  --b25-container-max: 1200px;
  --b25-container-padding: clamp(1.25rem, 5vw, 3rem);

  /* Transitions */
  --b25-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --b25-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --b25-duration-fast: 0.2s;
  --b25-duration-normal: 0.4s;
  --b25-duration-slow: 0.6s;

  /* Border radius */
  --b25-radius-sm: 8px;
  --b25-radius-md: 16px;
  --b25-radius-lg: 24px;
}

/* =========================================
   Base Styles
   ========================================= */
.basics-page-2025 {
  background: var(--b25-bg-primary);
  color: var(--b25-text-primary);
  font-family: var(--b25-font-body);
  overflow-x: hidden;
}

body.page-template-template-basics {
  background: var(--b25-bg-primary);
}

body.page-template-template-basics #content {
  background: var(--b25-bg-primary);
}

/* Header overlay */
body.page-template-template-basics #header-section {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  background: transparent !important;
  z-index: 100;
}

body.page-template-template-basics #header-section .site-header {
  background: transparent !important;
  box-shadow: none !important;
}

body.page-template-template-basics .followWrap {
  height: 0 !important;
}

@media (min-width: 1141px) {
  body.page-template-template-basics #header-section .onepress-menu > li > a {
    color: #fff;
  }
}

/* Container */
.basics-container {
  max-width: var(--b25-container-max);
  margin: 0 auto;
  padding: 0 var(--b25-container-padding);
}

/* =========================================
   Hero Section - 2025
   ========================================= */
.basics-hero-2025 {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.basics-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-color: var(--b25-bg-primary);
  transform: scale(1.05);
  animation: heroZoom 20s var(--b25-ease-out) infinite alternate;
}

@keyframes heroZoom {
  0% { transform: scale(1.05); }
  100% { transform: scale(1.15); }
}

.basics-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(12, 18, 32, 0.3) 0%,
    rgba(12, 18, 32, 0.2) 30%,
    rgba(12, 18, 32, 0.5) 60%,
    rgba(12, 18, 32, 0.95) 100%
  );
}

.basics-hero__noise {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
}

.basics-hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-bottom: var(--b25-space-3xl);
}

.basics-hero__container {
  max-width: var(--b25-container-max);
  margin: 0 auto;
  padding: 0 var(--b25-container-padding);
}

/* Hero Label */
.basics-hero__label {
  display: flex;
  align-items: center;
  gap: var(--b25-space-sm);
  margin-bottom: var(--b25-space-md);
  animation: fadeSlideUp 0.8s var(--b25-ease-out) 0.2s both;
}

.basics-hero__label .label-line {
  width: 40px;
  height: 1px;
  background: var(--b25-accent-primary);
}

.basics-hero__label .label-text {
  font-family: var(--b25-font-display);
  font-size: clamp(12px, 1.5vw, 14px);
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--b25-accent-primary);
}

/* Hero Title - Bilingual */
.basics-hero__title {
  display: flex;
  flex-direction: column;
  gap: var(--b25-space-xs);
  animation: fadeSlideUp 0.8s var(--b25-ease-out) 0.4s both;
}

.basics-hero__title .title-en {
  font-family: var(--b25-font-display);
  font-size: clamp(42px, 9vw, 100px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--b25-text-primary);
  text-shadow: 0 4px 60px rgba(0, 0, 0, 0.5);
}

.basics-hero__title .title-jp {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(16px, 2.5vw, 24px);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--b25-text-secondary);
  margin-top: var(--b25-space-sm);
}

/* Hero Scroll Indicator */
.basics-hero__scroll {
  position: absolute;
  bottom: var(--b25-space-xl);
  right: var(--b25-container-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--b25-space-sm);
  animation: fadeSlideUp 0.8s var(--b25-ease-out) 0.8s both;
}

.basics-hero__scroll .scroll-text {
  font-family: var(--b25-font-display);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--b25-text-tertiary);
  writing-mode: vertical-rl;
}

.basics-hero__scroll .scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(180deg, var(--b25-accent-primary), transparent);
  animation: scrollPulse 2s var(--b25-ease-in-out) infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.6); opacity: 0.5; }
}

@media (max-width: 768px) {
  .basics-hero-2025 {
    min-height: 80vh;
  }

  .basics-hero__content {
    padding-bottom: var(--b25-space-2xl);
  }

  .basics-hero__scroll {
    display: none;
  }
}

/* =========================================
   Table of Contents - Sticky Navigation
   ========================================= */
.basics-toc {
  position: sticky;
  top: 90px; /* ヘッダー高さ90pxに合わせる */
  z-index: 50;
  background: rgba(12, 18, 32, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--b25-border-subtle);
  padding: var(--b25-space-sm) 0;
}

.basics-toc__list {
  display: flex;
  justify-content: center;
  gap: var(--b25-space-md);
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.basics-toc__list::-webkit-scrollbar {
  display: none;
}

.basics-toc__link {
  font-family: var(--b25-font-display);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--b25-text-tertiary);
  text-decoration: none;
  padding: var(--b25-space-xs) var(--b25-space-sm);
  border-radius: 100px;
  transition: all var(--b25-duration-fast) var(--b25-ease-out);
  white-space: nowrap;
}

.basics-toc__link:hover,
.basics-toc__link.active {
  color: var(--b25-accent-primary);
  background: var(--b25-accent-glow);
}

@media (max-width: 768px) {
  .basics-toc__list {
    justify-content: flex-start;
    padding: 0 var(--b25-container-padding);
    gap: var(--b25-space-sm);
  }

  .basics-toc__link {
    font-size: 11px;
    padding: 6px 12px;
  }
}

/* =========================================
   Section Common Styles
   ========================================= */
.basics-section {
  padding: var(--b25-space-3xl) 0;
  background: var(--b25-bg-primary);
}

.basics-section--alt {
  background: var(--b25-bg-secondary);
}

/* Section Header - Reuse from technology */
.section-header {
  margin-bottom: var(--b25-space-xl);
}

.section-header--center {
  text-align: center;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--b25-space-sm);
  margin-bottom: var(--b25-space-md);
}

.section-label .label-number {
  font-family: var(--b25-font-display);
  font-size: 12px;
  font-weight: 600;
  color: var(--b25-accent-primary);
  padding: 6px 12px;
  background: var(--b25-accent-glow);
  border: 1px solid var(--b25-border-accent);
  border-radius: 100px;
}

.section-label .label-en {
  font-family: var(--b25-font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--b25-text-tertiary);
}

.section-title {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.4;
  color: var(--b25-text-primary);
  margin: 0 0 var(--b25-space-sm);
}

.section-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--b25-accent-primary), transparent);
  margin-top: var(--b25-space-md);
}

.section-line--center {
  margin-left: auto;
  margin-right: auto;
  background: linear-gradient(90deg, transparent, var(--b25-accent-primary), transparent);
}

.basics-section__lead {
  max-width: 800px;
  margin: 0 auto var(--b25-space-xl);
  text-align: center;
}

.basics-section__lead p {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 400;
  line-height: 2.2;
  color: var(--b25-text-secondary);
  margin: 0;
}

/* =========================================
   Introduction Section
   ========================================= */
.basics-intro__lead {
  max-width: 800px;
  margin: 0 auto var(--b25-space-xl);
  text-align: center;
}

.basics-intro__lead p {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 2.2;
  color: var(--b25-text-secondary);
  margin: 0;
}

.basics-intro__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--b25-space-xl);
  align-items: center;
  margin-bottom: var(--b25-space-xl);
}

.basics-intro__text p {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 2;
  color: var(--b25-text-secondary);
  margin: 0;
}

.basics-intro__image {
  border-radius: var(--b25-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.basics-intro__image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--b25-duration-slow) var(--b25-ease-out);
}

.basics-intro__image:hover img {
  transform: scale(1.03);
}

.basics-intro__gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--b25-space-md);
}

.basics-intro__gallery-item {
  border-radius: var(--b25-radius-md);
  overflow: hidden;
  animation: galleryFadeIn 0.6s var(--b25-ease-out) calc(var(--item-index) * 0.1s) both;
}

@keyframes galleryFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.basics-intro__gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
  transition: transform var(--b25-duration-normal) var(--b25-ease-out);
}

.basics-intro__gallery-item:hover img {
  transform: scale(1.08);
}

@media (max-width: 768px) {
  .basics-intro__content {
    grid-template-columns: 1fr;
    gap: var(--b25-space-lg);
  }

  .basics-intro__gallery {
    grid-template-columns: 1fr;
    gap: var(--b25-space-sm);
  }
}

/* =========================================
   Purpose Cards - Bento Style
   ========================================= */
.basics-purpose-bento {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--b25-space-md);
  max-width: 1000px;
  margin: 0 auto;
}

.purpose-card {
  position: relative;
  padding: var(--b25-space-lg);
  background: var(--b25-bg-card);
  border: 1px solid var(--b25-border-subtle);
  border-radius: var(--b25-radius-lg);
  overflow: hidden;
  transition: all var(--b25-duration-normal) var(--b25-ease-out);
  animation: cardFadeIn 0.5s var(--b25-ease-out) calc(var(--card-index) * 0.1s) both;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.purpose-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--b25-accent-primary), var(--b25-accent-light));
  opacity: 0;
  transition: opacity var(--b25-duration-normal) var(--b25-ease-out);
}

.purpose-card:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--b25-border-accent);
  transform: translateY(-4px);
}

.purpose-card:hover::before {
  opacity: 1;
}

.purpose-card__bg {
  position: absolute;
  top: -50%;
  right: -30%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--b25-accent-glow), transparent 70%);
  opacity: 0;
  transition: opacity var(--b25-duration-slow) var(--b25-ease-out);
  pointer-events: none;
}

.purpose-card:hover .purpose-card__bg {
  opacity: 1;
}

.purpose-card__header {
  display: flex;
  align-items: center;
  gap: var(--b25-space-sm);
  margin-bottom: var(--b25-space-md);
}

.purpose-card__number {
  font-family: var(--b25-font-display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 800;
  color: var(--b25-accent-primary);
  line-height: 1;
}

.purpose-card__label {
  font-family: var(--b25-font-display);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--b25-text-muted);
}

.purpose-card__text {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(14px, 1.5vw, 15px);
  line-height: 1.9;
  color: var(--b25-text-secondary);
  margin: 0;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .basics-purpose-bento {
    grid-template-columns: 1fr;
  }

  .purpose-card {
    padding: var(--b25-space-md);
  }
}

/* =========================================
   Mechanism Grid
   ========================================= */
.basics-mechanism-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--b25-space-lg);
  max-width: 1000px;
  margin: 0 auto;
}

.mechanism-card {
  background: var(--b25-bg-card);
  border: 1px solid var(--b25-border-subtle);
  border-radius: var(--b25-radius-lg);
  overflow: hidden;
  transition: all var(--b25-duration-normal) var(--b25-ease-out);
  animation: cardFadeIn 0.5s var(--b25-ease-out) calc(var(--card-index) * 0.15s) both;
}

.mechanism-card:hover {
  border-color: var(--b25-border-accent);
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
}

.mechanism-card__title {
  display: flex;
  align-items: center;
  gap: var(--b25-space-sm);
  padding: var(--b25-space-md) var(--b25-space-lg);
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--b25-border-subtle);
  margin: 0;
}

.mechanism-card__title .title-number {
  font-family: var(--b25-font-display);
  font-size: 12px;
  font-weight: 600;
  color: var(--b25-accent-primary);
  padding: 4px 10px;
  background: var(--b25-accent-glow);
  border-radius: 100px;
}

.mechanism-card__title .title-text {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(14px, 1.5vw, 16px);
  font-weight: 600;
  color: var(--b25-text-primary);
}

.mechanism-card__image {
  padding: var(--b25-space-md);
  background: #fff;
}

.mechanism-card__image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--b25-radius-sm);
}

@media (max-width: 768px) {
  .basics-mechanism-grid {
    grid-template-columns: 1fr;
    gap: var(--b25-space-md);
  }
}

/* =========================================
   Material Section
   ========================================= */
.basics-material--desktop {
  display: flex;
  flex-direction: column;
  gap: var(--b25-space-2xl);
}

.basics-material--mobile {
  display: none;
}

.material-row {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--b25-space-xl);
  align-items: center;
}

.material-row--reverse {
  grid-template-columns: 3fr 2fr;
}

.material-row__content p {
  font-family: var(--b25-font-body-jp);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 2;
  color: var(--b25-text-secondary);
  margin: 0;
}

.material-row__image {
  border-radius: var(--b25-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.material-row__image img {
  width: 100%;
  height: auto;
  display: block;
}

.material-mobile__text p {
  font-family: var(--b25-font-body-jp);
  font-size: 15px;
  line-height: 2;
  color: var(--b25-text-secondary);
  margin: 0 0 1em;
}

.material-mobile__image {
  margin-top: var(--b25-space-lg);
  border-radius: var(--b25-radius-md);
  overflow: hidden;
}

.material-mobile__image img {
  width: 100%;
  height: auto;
  display: block;
}

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

  .basics-material--mobile {
    display: block;
  }
}

/* =========================================
   Videos Section
   ========================================= */
.basics-videos {
  display: flex;
  flex-direction: column;
  gap: var(--b25-space-xl);
  max-width: 800px;
  margin: 0 auto var(--b25-space-xl);
}

.video-card {
  animation: videoFadeIn 0.6s var(--b25-ease-out) calc(var(--video-index) * 0.15s) both;
}

@keyframes videoFadeIn {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.video-card__frame {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--b25-radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  background: var(--b25-bg-tertiary);
}

.video-card__frame iframe,
.video-card__frame video,
.video-card__frame embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.basics-videos__more {
  text-align: center;
}

.btn-outline {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--b25-space-md) var(--b25-space-xl);
  background: transparent;
  border: 2px solid var(--b25-accent-primary);
  border-radius: 100px;
  text-decoration: none;
  transition: all var(--b25-duration-normal) var(--b25-ease-out);
  position: relative;
}

.btn-outline:hover {
  background: var(--b25-accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(20, 184, 166, 0.3);
}

.btn-outline .btn-text {
  font-family: var(--b25-font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--b25-accent-primary);
  transition: color var(--b25-duration-fast);
}

.btn-outline:hover .btn-text {
  color: var(--b25-bg-primary);
}

.btn-outline .btn-text-jp {
  font-family: var(--b25-font-body-jp);
  font-size: 11px;
  color: var(--b25-text-tertiary);
  transition: color var(--b25-duration-fast);
}

.btn-outline:hover .btn-text-jp {
  color: rgba(12, 18, 32, 0.7);
}

.btn-outline .btn-icon {
  position: absolute;
  right: var(--b25-space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--b25-accent-primary);
  transition: all var(--b25-duration-fast);
}

.btn-outline:hover .btn-icon {
  color: var(--b25-bg-primary);
  transform: translateY(-50%) translate(4px, -4px);
}

/* =========================================
   Animations
   ========================================= */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================
   Responsive Refinements
   ========================================= */
@media (max-width: 768px) {
  .basics-section {
    padding: var(--b25-space-2xl) 0;
  }

  .section-header {
    margin-bottom: var(--b25-space-lg);
  }
}

/* =========================================
   Mobile/Tablet - Hide TOC on scroll (1140px and below)
   ========================================= */
@media screen and (max-width: 1140px) {
  .basics-toc {
    top: 70px;
    transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
  }

  .basics-toc.toc-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }
}

/* 横向きモバイル - ヘッダー50pxに合わせる */
@media screen and (max-height: 500px) and (min-width: 500px) {
  .basics-toc {
    top: 50px;
  }
}

/* =========================================
   Print Styles
   ========================================= */
@media print {
  .basics-page-2025 {
    background: #fff;
    color: #000;
  }

  .basics-hero-2025 {
    min-height: auto;
    padding: 2rem 0;
  }

  .basics-hero__bg,
  .basics-hero__overlay,
  .basics-hero__noise,
  .basics-hero__scroll,
  .basics-toc {
    display: none;
  }

  .basics-hero__title .title-en,
  .basics-hero__title .title-jp {
    color: #000;
  }
}