/* ===================================
   アイデアビット株式会社 - メインスタイルシート
   デザインコンセプト: シンプル・モダン
   =================================== */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #1a1a2e;
  --color-secondary: #2c5f8a;
  --color-accent: #4a7fb5;
  --color-bg-main: #ffffff;
  --color-bg-section: #f5f7fa;
  --color-text-main: #333333;
  --color-text-sub: #666666;
  --color-text-light: #999999;
  --color-border: #e0e4e8;
  --color-success: #28a745;
  --color-error: #dc3545;
  --font-family-ja: 'Noto Sans JP', sans-serif;
  --font-family-en: 'Inter', sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --transition: 0.3s ease;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-ja);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

.section {
  padding: 100px 0;
}

.section--gray {
  background-color: var(--color-bg-section);
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.section__subtitle {
  font-family: var(--font-family-en);
  font-size: 0.875rem;
  text-align: center;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
  font-weight: 600;
}

.section__desc {
  text-align: center;
  color: var(--color-text-sub);
  max-width: 640px;
  margin: 0 auto 60px;
  font-size: 1rem;
}

/* --- Fade-in Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.header__logo a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.header__logo .logo-img {
  height: 40px;
  width: auto;
  display: block;
  mix-blend-mode: multiply;
}

.header__logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #4a7fb5 0%, #2c5f8a 50%, #1a4068 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-family-en);
  font-weight: 800;
  font-size: 1rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 4px rgba(0, 40, 80, 0.3);
}

/* Footer logo */
.footer__logo-img {
  height: 32px;
  width: auto;
  margin-bottom: 16px;
}

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

.nav__link {
  color: var(--color-text-main);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-secondary);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-secondary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__contact-btn {
  display: inline-block;
  padding: 10px 24px;
  background: linear-gradient(135deg, #4a7fb5 0%, #2c5f8a 50%, #1a4068 100%);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  border: 1px solid rgba(120, 180, 230, 0.4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 6px rgba(0, 40, 80, 0.3);
}

.nav__contact-btn:hover {
  background: linear-gradient(135deg, #5a8fc5 0%, #3a6f9a 50%, #2a5078 100%);
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 4px 12px rgba(0, 60, 120, 0.4);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===================================
   HERO SECTION
   =================================== */
/* --- Section Animation (iframe background) --- */
.section-animation {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  z-index: 0;
  pointer-events: none;
}

.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, #16213e 50%, #0f3460 100%);
  color: #fff;
  text-align: center;
  padding: calc(var(--header-height) + 60px) 24px 80px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 30% 50%, rgba(74, 127, 181, 0.15) 0%, transparent 60%),
              radial-gradient(circle at 70% 80%, rgba(44, 95, 138, 0.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero__subtitle {
  font-family: var(--font-family-en);
  font-size: 0.875rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
  font-weight: 500;
}

.hero__title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: 2px;
}

.hero__desc {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.9;
  margin-bottom: 40px;
}

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

/* ===================================
   BUTTONS
   =================================== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-align: center;
}

.btn--primary {
  background: linear-gradient(135deg, #4a7fb5 0%, #2c5f8a 50%, #1a4068 100%);
  color: #fff;
  border: 1px solid rgba(120, 180, 230, 0.4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 6px rgba(0, 40, 80, 0.3);
}

.btn--primary:hover {
  background: linear-gradient(135deg, #5a8fc5 0%, #3a6f9a 50%, #2a5078 100%);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 4px 16px rgba(0, 60, 120, 0.4);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(120, 180, 230, 0.6);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.btn--outline:hover {
  background: linear-gradient(135deg, rgba(74, 127, 181, 0.3) 0%, rgba(44, 95, 138, 0.3) 100%);
  border-color: rgba(160, 210, 255, 0.8);
  color: #fff;
  box-shadow: 0 0 12px rgba(80, 160, 230, 0.25);
}

.btn--outline-dark {
  background: transparent;
  color: #3a6f9a;
  border: 2px solid #3a6f9a;
}

.btn--outline-dark:hover {
  background: linear-gradient(135deg, #4a7fb5 0%, #2c5f8a 50%, #1a4068 100%);
  color: #fff;
  border-color: transparent;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 8px rgba(0, 40, 80, 0.3);
}

.btn--sm {
  padding: 10px 24px;
  font-size: 0.875rem;
}

/* ===================================
   PAGE HERO (Sub pages)
   =================================== */
.page-hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, #16213e 100%);
  color: #fff;
  text-align: center;
  padding: calc(var(--header-height) + 100px) 24px 100px;
  overflow: hidden;
}

.page-hero__title {
  position: relative;
  z-index: 2;
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #fff;
}

.page-hero__subtitle {
  position: relative;
  z-index: 2;
  font-family: var(--font-family-en);
  font-size: 0.875rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #fff;
  font-weight: 700;
}

/* Breadcrumb */
.breadcrumb {
  background: var(--color-bg-section);
  padding: 12px 0;
  font-size: 0.8125rem;
}

.breadcrumb__list {
  display: flex;
  gap: 8px;
  align-items: center;
}

.breadcrumb__list li::after {
  content: '>';
  margin-left: 8px;
  color: var(--color-text-light);
}

.breadcrumb__list li:last-child::after {
  display: none;
}

.breadcrumb__list a {
  color: var(--color-text-sub);
}

.breadcrumb__list li:last-child {
  color: var(--color-text-main);
  font-weight: 500;
}

/* ===================================
   CARDS
   =================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.card-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background: var(--color-bg-main);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card__icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #4a7fb5 0%, #2c5f8a 50%, #1a4068 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 6px rgba(0, 40, 80, 0.3);
}

.card__icon svg {
  width: 28px;
  height: 28px;
  fill: #fff;
  stroke: #fff;
}

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.card__text {
  color: var(--color-text-sub);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.card__badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-bg-section);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--color-text-sub);
  font-weight: 500;
  margin-bottom: 16px;
}

.card__badge--past {
  background: #f0f0f0;
  color: var(--color-text-light);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-secondary);
}

.card__link:hover {
  gap: 10px;
}

/* ===================================
   FEATURES (Strengths)
   =================================== */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  text-align: center;
}

.feature__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--color-bg-section);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature__icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--color-secondary);
  fill: none;
  stroke-width: 2;
}

.feature__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.feature__text {
  color: var(--color-text-sub);
  font-size: 0.9375rem;
}

/* ===================================
   MEDIA ARTICLES
   =================================== */
.media-card {
  background: var(--color-bg-main);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

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

.media-card__body {
  padding: 28px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.media-card__source {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.media-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  line-height: 1.6;
}

.media-card__desc {
  color: var(--color-text-sub);
  font-size: 0.875rem;
  line-height: 1.8;
  flex: 1;
}

.media-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-secondary);
}

/* ===================================
   TABLE
   =================================== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
}

.info-table th,
.info-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.info-table th {
  background: var(--color-bg-section);
  font-weight: 600;
  color: var(--color-primary);
  width: 180px;
  white-space: nowrap;
}

.info-table td {
  color: var(--color-text-main);
}

/* ===================================
   TIMELINE
   =================================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 40px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: 16px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--color-secondary);
  border-radius: 50%;
  border: 3px solid var(--color-bg-main);
  box-shadow: 0 0 0 2px var(--color-secondary);
}

.timeline__year {
  font-family: var(--font-family-en);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.timeline__text {
  color: var(--color-text-main);
  font-size: 0.9375rem;
}

/* ===================================
   WORKFLOW
   =================================== */
.workflow {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
  justify-content: center;
}

.workflow__step {
  text-align: center;
  flex: 1;
  min-width: 120px;
}

.workflow__number {
  width: 48px;
  height: 48px;
  background: var(--color-secondary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-family: var(--font-family-en);
  font-weight: 700;
  font-size: 1.125rem;
}

.workflow__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
}

.workflow__arrow {
  display: flex;
  align-items: center;
  padding-top: 14px;
  color: var(--color-border);
  font-size: 1.25rem;
}

/* ===================================
   CONTACT FORM
   =================================== */
.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.form-group label .required {
  color: var(--color-error);
  font-size: 0.75rem;
  margin-left: 6px;
}

.form-group label .optional {
  color: var(--color-text-light);
  font-size: 0.75rem;
  margin-left: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font-family-ja);
  color: var(--color-text-main);
  background: var(--color-bg-main);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(44, 95, 138, 0.15);
}

.form-group textarea {
  min-height: 180px;
  resize: vertical;
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: var(--color-error);
}

.form-group .error-message {
  color: var(--color-error);
  font-size: 0.8125rem;
  margin-top: 6px;
  display: none;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 32px 0;
}

.form-checkbox input[type="checkbox"] {
  width: auto;
  margin-top: 4px;
  accent-color: var(--color-secondary);
}

.form-checkbox label {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  font-weight: 400;
  margin-bottom: 0;
}

.form-submit {
  text-align: center;
}

.form-submit .btn {
  min-width: 240px;
  font-size: 1rem;
  padding: 16px 40px;
}

/* Success / Error message */
.form-result {
  display: none;
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius-md);
  margin-top: 24px;
}

.form-result--success {
  background: #f0faf0;
  color: var(--color-success);
}

.form-result--error {
  background: #fef0f0;
  color: var(--color-error);
}

.form-result h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

/* ===================================
   CTA SECTION
   =================================== */
.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f3460 100%);
  color: #fff;
  text-align: center;
  padding: 80px 24px;
}

.cta__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta__text {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
  font-size: 1rem;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
}

.footer__company-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer__address {
  font-size: 0.8125rem;
  line-height: 1.8;
}

.footer__heading {
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer__nav li {
  margin-bottom: 10px;
}

.footer__nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
}

.footer__nav a:hover {
  color: #fff;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ===================================
   ABOUT PAGE
   =================================== */
.greeting {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}

.greeting__photo {
  width: 200px;
  height: 240px;
  background: var(--color-bg-section);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
  overflow: hidden;
}

.greeting__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.greeting__text h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.greeting__text p {
  color: var(--color-text-sub);
  margin-bottom: 16px;
  line-height: 2;
}

.greeting__name {
  text-align: right;
  margin-top: 24px;
  font-weight: 600;
  color: var(--color-primary);
}

/* Profile */
.profile-section {
  max-width: 800px;
  margin: 0 auto;
}

.profile-section h3 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.skill-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-bg-section);
  border-radius: 20px;
  font-size: 0.8125rem;
  color: var(--color-text-main);
  font-weight: 500;
}

/* Map */
.map-container {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.map-container iframe {
  width: 100%;
  height: 400px;
  border: none;
}

/* ===================================
   SERVICES PAGE
   =================================== */
.service-detail {
  max-width: 900px;
  margin: 0 auto;
}

.service-detail h3 {
  font-size: 1.375rem;
  color: var(--color-primary);
  margin-bottom: 16px;
  margin-top: 48px;
}

.service-detail h3:first-child {
  margin-top: 0;
}

.service-detail p {
  color: var(--color-text-sub);
  margin-bottom: 16px;
  line-height: 1.9;
}

.tech-stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.tech-stack__item {
  padding: 20px;
  background: var(--color-bg-section);
  border-radius: var(--radius-md);
}

.tech-stack__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.tech-stack__list {
  font-size: 0.9375rem;
  color: var(--color-text-main);
}

/* Portfolio (past service) */
.portfolio-notice {
  background: var(--color-bg-section);
  border-left: 4px solid var(--color-text-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 24px;
  font-size: 0.875rem;
  color: var(--color-text-sub);
}

/* ===================================
   PRIVACY PAGE
   =================================== */
.privacy-content {
  max-width: 800px;
  margin: 0 auto;
}

.privacy-content h3 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin: 40px 0 16px;
}

.privacy-content h3:first-child {
  margin-top: 0;
}

.privacy-content p {
  color: var(--color-text-sub);
  line-height: 2;
  margin-bottom: 12px;
}

/* ===================================
   RESPONSIVE - Tablet (768px)
   =================================== */
@media (max-width: 1024px) {
  .card-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .features {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--color-bg-main);
    box-shadow: var(--shadow-lg);
    padding: calc(var(--header-height) + 24px) 32px 32px;
    transition: right var(--transition);
    z-index: 999;
  }

  .nav.open {
    right: 0;
  }

  .nav__list {
    flex-direction: column;
    gap: 0;
  }

  .nav__link {
    display: block;
    padding: 16px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__contact-btn {
    margin-top: 16px;
    text-align: center;
    display: block;
  }

  .overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
  }

  .overlay.active {
    display: block;
  }

  .hero {
    min-height: 70vh;
    padding: calc(var(--header-height) + 40px) 20px 60px;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__desc {
    font-size: 1rem;
  }

  .section {
    padding: 64px 0;
  }

  .section__title {
    font-size: 1.5rem;
  }

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

  .card-grid--3 {
    grid-template-columns: 1fr;
  }

  .features {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .greeting {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .greeting__photo {
    margin: 0 auto;
  }

  .greeting__name {
    text-align: center;
  }

  .info-table th {
    width: 120px;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .workflow {
    flex-direction: column;
    align-items: center;
  }

  .workflow__arrow {
    transform: rotate(90deg);
    padding-top: 0;
  }

  .page-hero__title {
    font-size: 1.75rem;
  }
}

/* ===================================
   SUMMARIES PAGE
   =================================== */

/* Intro */
.summary-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.summary-intro__lead {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.summary-intro__text {
  font-size: 1rem;
  color: var(--color-text-sub);
  line-height: 2;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 48px auto 0;
}

.stat-card {
  text-align: center;
  padding: 32px 16px;
  background: var(--color-bg-main);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-card__number {
  font-family: var(--font-family-en);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-secondary);
  line-height: 1;
}

.stat-card__unit {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-secondary);
}

.stat-card__label {
  font-size: 0.8125rem;
  color: var(--color-text-sub);
  margin-top: 8px;
}

/* Strength List */
.strength-list {
  max-width: 880px;
  margin: 0 auto;
}

.strength-item {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
}

.strength-item:last-child {
  border-bottom: none;
}

.strength-item__number {
  font-family: var(--font-family-en);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  opacity: 0.6;
  line-height: 1;
  flex-shrink: 0;
  width: 60px;
}

.strength-item__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.strength-item__text {
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 2;
}

/* Expertise Grid */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.expertise-card {
  background: var(--color-bg-main);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.expertise-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--color-secondary);
}

.expertise-card__icon svg {
  width: 100%;
  height: 100%;
}

.expertise-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.expertise-card__list {
  list-style: none;
}

.expertise-card__list li {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.expertise-card__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
}

/* Representative Profile */
.rep-profile {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  align-items: center;
  max-width: 800px;
  margin: 48px auto 0;
  background: var(--color-bg-main);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.rep-profile__photo {
  width: 180px;
  height: 200px;
  background: var(--color-bg-section);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
  overflow: hidden;
}

.rep-profile__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.rep-profile__name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.rep-profile__name span {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-sub);
  margin-left: 8px;
}

.rep-profile__role {
  font-size: 0.875rem;
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: 16px;
}

.rep-profile__bio {
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.9;
  margin-bottom: 16px;
}

.rep-profile__qualifications {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Promise Grid */
.promise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.promise-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.promise-item__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  color: var(--color-success);
}

.promise-item__icon svg {
  width: 100%;
  height: 100%;
}

.promise-item__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.promise-item__text {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  line-height: 1.8;
}

/* SP only line break */
.sp-only {
  display: none;
}

/* ===================================
   RESPONSIVE - Summaries page additions
   =================================== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .expertise-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .summary-intro__lead {
    font-size: 1.375rem;
  }

  .sp-only {
    display: inline;
  }

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

  .stat-card__number {
    font-size: 2rem;
  }

  .strength-item {
    flex-direction: column;
    gap: 12px;
    padding: 28px 0;
  }

  .strength-item__number {
    font-size: 1.75rem;
  }

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

  .rep-profile {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 32px 24px;
  }

  .rep-profile__photo {
    margin: 0 auto;
  }

  .rep-profile__qualifications {
    justify-content: center;
  }

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

@media (max-width: 480px) {
  .hero__title {
    font-size: 1.625rem;
  }

  .hero__buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
  }

  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table th {
    border-bottom: none;
    padding-bottom: 4px;
  }

  .info-table td {
    padding-top: 4px;
    padding-bottom: 16px;
  }
}