/* 海士町AIアンバサダー デモサイト — スタイルシート */

:root {
  --deep-blue: #1a4a6b;
  --mid-blue: #2a6496;
  --light-blue: #4a90c4;
  --ocean-blue: #0d3554;
  --sand: #f5e6c8;
  --sand-dark: #e8d5a8;
  --forest-green: #2d6a4f;
  --forest-light: #40916c;
  --white: #ffffff;
  --text-dark: #1a2a3a;
  --text-muted: #5a7a8a;
  --shadow: rgba(26, 74, 107, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.7;
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(26, 74, 107, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-mark {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--light-blue), var(--forest-green));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.logo-text {
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.logo-sub {
  color: rgba(255,255,255,0.7);
  font-size: 0.7rem;
  font-weight: 400;
  display: block;
}

.site-nav {
  display: flex;
  gap: 2rem;
}

.site-nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--sand);
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  background:
    linear-gradient(160deg, rgba(13, 53, 84, 0.85) 0%, rgba(26, 74, 107, 0.75) 40%, rgba(45, 106, 79, 0.6) 100%),
    linear-gradient(to bottom right, #0d3554 0%, #1a4a6b 30%, #2d6a4f 70%, #1a4a6b 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

/* Wave decoration */
.hero::before {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--white);
  clip-path: ellipse(55% 100% at 50% 100%);
}

/* Animated wave patterns */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse at 20% 70%, rgba(74, 144, 196, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 30%, rgba(64, 145, 108, 0.1) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  background: rgba(245, 230, 200, 0.15);
  border: 1px solid rgba(245, 230, 200, 0.3);
  color: var(--sand);
  padding: 0.4rem 1.2rem;
  border-radius: 2rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.hero-title {
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.hero-title em {
  font-style: normal;
  color: var(--sand);
}

.hero-sub {
  color: rgba(255,255,255,0.8);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  margin-bottom: 0.75rem;
  font-weight: 300;
}

.hero-tagline {
  color: rgba(245, 230, 200, 0.9);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  margin-bottom: 3rem;
  font-weight: 400;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--sand);
  color: var(--deep-blue);
  padding: 0.875rem 2rem;
  border-radius: 2rem;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(245, 230, 200, 0.3);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245, 230, 200, 0.4);
}

/* ===== SECTION COMMON ===== */
section {
  padding: 5rem 2rem;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  color: var(--light-blue);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--deep-blue);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 540px;
  margin-bottom: 3rem;
}

/* ===== ABOUT (ISLANDS) ===== */
.about {
  background: var(--white);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: linear-gradient(135deg, rgba(26, 74, 107, 0.03) 0%, rgba(45, 106, 79, 0.03) 100%);
  border: 1px solid rgba(26, 74, 107, 0.1);
  border-radius: 16px;
  padding: 2rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--shadow);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--deep-blue);
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== AI DEMO ===== */
.ai-demo {
  background: linear-gradient(135deg, var(--ocean-blue) 0%, var(--deep-blue) 60%, var(--forest-green) 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.ai-demo::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(ellipse at 10% 50%, rgba(74, 144, 196, 0.2) 0%, transparent 60%),
    radial-gradient(ellipse at 90% 20%, rgba(64, 145, 108, 0.15) 0%, transparent 50%);
}

.ai-demo .section-inner {
  position: relative;
  z-index: 1;
}

.ai-demo .section-label {
  color: var(--sand);
}

.ai-demo .section-title {
  color: var(--white);
}

.ai-demo .section-desc {
  color: rgba(255,255,255,0.75);
  max-width: 600px;
}

.demo-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 768px) {
  .demo-layout {
    grid-template-columns: 1fr;
  }
}

.demo-info h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--sand);
}

.demo-info p {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.demo-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.demo-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
}

.demo-features li span {
  flex-shrink: 0;
  font-size: 1rem;
}

/* Chat widget */
.chat-widget-container {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 20px;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.chat-widget-header {
  background: rgba(255,255,255,0.1);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.chat-avatar {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--light-blue), var(--forest-green));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.chat-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--white);
}

.chat-status {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
}

.chat-online {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: #4ade80;
  border-radius: 50%;
  margin-right: 4px;
}

.chat-messages {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 240px;
}

.chat-msg {
  max-width: 85%;
}

.chat-msg.from-ai {
  align-self: flex-start;
}

.chat-msg.from-user {
  align-self: flex-end;
}

.chat-bubble {
  padding: 0.75rem 1rem;
  border-radius: 16px;
  font-size: 0.875rem;
  line-height: 1.6;
}

.from-ai .chat-bubble {
  background: rgba(255,255,255,0.12);
  color: var(--white);
  border-bottom-left-radius: 4px;
}

.from-user .chat-bubble {
  background: var(--sand);
  color: var(--deep-blue);
  border-bottom-right-radius: 4px;
}

.chat-input-area {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.chat-input-area input {
  flex: 1;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 2rem;
  padding: 0.625rem 1rem;
  color: var(--white);
  font-size: 0.875rem;
  font-family: inherit;
  outline: none;
}

.chat-input-area input::placeholder {
  color: rgba(255,255,255,0.4);
}

.chat-send-btn {
  width: 36px;
  height: 36px;
  background: var(--sand);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  color: var(--deep-blue);
  flex-shrink: 0;
  transition: transform 0.15s;
}

.chat-send-btn:hover {
  transform: scale(1.1);
}

.widget-notice {
  text-align: center;
  padding: 0.75rem 1.25rem 1rem;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.4);
}

/* ===== RE100 ===== */
.re100 {
  background: linear-gradient(to right, rgba(245, 230, 200, 0.3), rgba(245, 230, 200, 0.1));
  border-top: 1px solid rgba(26, 74, 107, 0.1);
  border-bottom: 1px solid rgba(26, 74, 107, 0.1);
  padding: 3rem 2rem;
}

.re100-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.re100-badge {
  background: var(--forest-green);
  color: var(--white);
  padding: 0.5rem 1.25rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
  flex-shrink: 0;
}

.re100-text {
  color: var(--text-dark);
  font-size: 0.95rem;
}

.re100-text strong {
  color: var(--forest-green);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--ocean-blue);
  color: rgba(255,255,255,0.7);
  padding: 3rem 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 600px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .site-nav {
    display: none;
  }
}

.footer-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.footer-logo span {
  font-size: 0.8rem;
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  display: block;
  margin-top: 0.2rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  margin-top: 0.75rem;
}

.footer-right {
  text-align: right;
}

.footer-right p {
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.footer-right a {
  color: var(--sand);
  text-decoration: none;
  font-size: 0.8rem;
}