/* ========================================
   monostock LP - Clean & Minimal
   ======================================== */

:root {
  /* Base Colors */
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-sub: #666666;
  --text-muted: #999999;
  --border: #e8e8e8;

  /* Brand Colors - Olive/Sage Green */
  --primary: #7d8b6e;
  --primary-dark: #5d6b4e;
  --primary-light: #e8ede4;
  --primary-lighter: #f4f7f2;
  --accent: #5a6b4a;

  /* Effects */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-accent: 0 8px 24px rgba(125, 139, 110, 0.25);

  /* Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1080px;
  --font: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

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

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.logo {
  display: flex;
  align-items: center;
}

.logo__img {
  height: 28px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav__link {
  font-size: 14px;
  color: var(--text-sub);
  transition: color var(--transition);
}

.nav__link:hover {
  color: var(--primary-dark);
}

.nav__cta {
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  background: var(--primary);
  color: var(--surface);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

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

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
}

.menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 16px 20px 24px;
  border-top: 1px solid var(--border);
}

.mobile-nav__link {
  padding: 14px 0;
  color: var(--text-sub);
  border-bottom: 1px solid var(--border);
}

.mobile-nav__cta {
  margin-top: 16px;
  padding: 14px;
  background: var(--primary);
  color: var(--surface);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav { display: none; }
  .menu-btn { display: flex; }
  .mobile-nav[hidden] { display: none; }
  .mobile-nav:not([hidden]) { display: flex; }
}

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

.hero {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, var(--primary-lighter) 0%, var(--bg) 100%);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero__content {
  max-width: 480px;
}

.hero__badge {
  display: inline-flex;
  padding: 6px 14px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--primary);
}

.hero__title {
  margin-top: 20px;
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.5px;
}

.accent-text {
  color: var(--primary-dark);
}

.hero__lead {
  margin-top: 20px;
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.9;
}

.hero__cta {
  display: flex;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.btn__icon {
  width: 18px;
  height: 18px;
}

.btn--primary {
  background: var(--text);
  color: var(--surface);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

.hero__checks {
  display: flex;
  gap: 20px;
  margin-top: 24px;
  list-style: none;
}

.hero__checks li {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-sub);
}

.hero__checks li::before {
  content: "✓";
  font-weight: 700;
  color: var(--primary);
}

/* Hero Visual */
.hero__visual {
  display: flex;
  justify-content: center;
}

.phone-mockup {
  position: relative;
  width: 260px;
  padding: 10px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.phone-mockup__img {
  border-radius: var(--radius-lg);
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero__content {
    max-width: 100%;
    text-align: center;
  }
  .hero__cta {
    justify-content: center;
  }
  .hero__checks {
    justify-content: center;
    flex-wrap: wrap;
  }
  .phone-mockup {
    width: 220px;
  }
}

@media (max-width: 480px) {
  .hero__cta {
    flex-direction: column;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ========================================
   Problem
   ======================================== */

.problem {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.problem-card {
  padding: 28px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-align: center;
}

.problem-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
}

.problem-card__title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

.problem-card__text {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .problem__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
}

/* ========================================
   Section Commons
   ======================================== */

.section-header {
  margin-bottom: 40px;
}

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

.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 900;
  letter-spacing: -0.3px;
}

/* ========================================
   Features
   ======================================== */

.features {
  padding: 80px 0;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.feature-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-md);
}

.feature-card__title {
  margin-top: 18px;
  font-size: 16px;
  font-weight: 700;
}

.feature-card__text {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.8;
}

@media (max-width: 900px) {
  .features__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
}

/* ========================================
   Screens
   ======================================== */

.screens {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.screens__slider {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--primary-lighter);
  border: 1px solid var(--border);
}

.screens__track {
  display: flex;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.screen-item {
  min-width: 100%;
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.screen-item__phone {
  width: 220px;
  padding: 8px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.screen-item__phone img {
  border-radius: var(--radius-lg);
}

.screen-item__label {
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-sub);
  font-weight: 500;
}

.screens__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.slider-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  transition: all var(--transition);
}

.slider-btn:hover {
  background: var(--primary);
  color: var(--surface);
  border-color: var(--primary);
}

.slider-dots {
  display: flex;
  gap: 8px;
}

.slider-dot {
  width: 8px;
  height: 8px;
  background: var(--border);
  border-radius: 50%;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.slider-dot.active {
  width: 24px;
  background: var(--primary);
  border-radius: 4px;
}

/* ========================================
   Use Cases
   ======================================== */

.usecases {
  padding: 80px 0;
}

.usecases__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.usecase-card {
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition);
}

.usecase-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.usecase-card__icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.usecase-card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.usecase-card__text {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
}

@media (max-width: 600px) {
  .usecases__grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Value
   ======================================== */

.value {
  padding: 100px 0;
  background: var(--primary);
  color: var(--surface);
}

.value__inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.value__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.value__title {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  line-height: 1.5;
}

.value__text {
  margin-top: 20px;
  font-size: 14px;
  opacity: 0.85;
  line-height: 1.9;
}

/* ========================================
   FAQ
   ======================================== */

.faq {
  padding: 80px 0;
}

.faq__list {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item__q {
  padding: 18px 20px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item__q::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.faq-item[open] .faq-item__q::after {
  transform: rotate(45deg);
}

.faq-item__q::-webkit-details-marker {
  display: none;
}

.faq-item__a {
  padding: 0 20px 18px;
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.8;
}

/* ========================================
   Download
   ======================================== */

.download {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.download__card {
  max-width: 480px;
  margin: 0 auto;
  padding: 48px 32px;
  text-align: center;
  background: var(--primary-lighter);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-xl);
}

.download__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.download__title {
  font-size: 24px;
  font-weight: 900;
}

.download__text {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding: 14px 24px;
  background: var(--text);
  color: var(--surface);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.store-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.store-btn__icon {
  width: 24px;
  height: 24px;
}

.store-btn__icon svg {
  width: 100%;
  height: 100%;
}

.store-btn__text {
  text-align: left;
}

.store-btn__sub {
  display: block;
  font-size: 10px;
  opacity: 0.7;
}

.store-btn__main {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.download__note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

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

.footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__logo {
  height: 24px;
  width: auto;
}

.footer__copy {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.footer__nav {
  display: flex;
  gap: 20px;
}

.footer__nav a {
  font-size: 12px;
  color: var(--text-sub);
  transition: color var(--transition);
}

.footer__nav a:hover {
  color: var(--primary-dark);
}

@media (max-width: 600px) {
  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }
}

/* ========================================
   Animations
   ======================================== */

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

.hero__content,
.hero__visual {
  animation: fadeInUp 0.7s ease-out;
}

.hero__visual {
  animation-delay: 0.15s;
  animation-fill-mode: both;
}

/* ========================================
   Page Content (Privacy, Contact)
   ======================================== */

.page-content {
  padding: 60px 0 100px;
  min-height: calc(100vh - 200px);
}

.page-header {
  margin-bottom: 48px;
}

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

.page-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 900;
  letter-spacing: -0.3px;
}

.page-date {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.page-lead {
  margin-top: 16px;
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
}

.page-body {
  max-width: 720px;
}

.page-back {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

/* Policy Sections */
.policy-section {
  margin-bottom: 40px;
}

.policy-section:last-child {
  margin-bottom: 0;
}

.policy-section h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-light);
}

.policy-section p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.9;
  margin-bottom: 12px;
}

.policy-section p:last-child {
  margin-bottom: 0;
}

.policy-section ul {
  margin: 16px 0;
  padding-left: 24px;
}

.policy-section li {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 8px;
}

.policy-section a {
  color: var(--primary-dark);
  text-decoration: underline;
}

.policy-section a:hover {
  color: var(--primary);
}

/* Contact Card */
.contact-card {
  max-width: 480px;
  margin: 0 auto;
  padding: 48px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  text-align: center;
}

.contact-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--text);
  color: var(--surface);
  border-radius: var(--radius-lg);
}

.contact-card__icon svg {
  width: 32px;
  height: 32px;
}

.contact-card__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-card__text {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 24px;
}

.contact-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--text);
  color: var(--surface);
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.contact-card__btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.contact-card__btn-icon {
  width: 20px;
  height: 20px;
}

.contact-card__note {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* Contact Info */
.contact-info {
  max-width: 480px;
  margin: 48px auto 0;
  padding: 28px;
  background: var(--primary-lighter);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-lg);
}

.contact-info h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-info p {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 16px;
}

.contact-info ul {
  padding-left: 20px;
}

.contact-info li {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 4px;
}