/* ==========================================================
   common.css — Studio Totonoe 共通スタイル
   全ページで使用するトークン・リセット・コンポーネントを定義
========================================================== */

/* ===== CSS Variables ===== */
:root {
  --color-bg:           #F8F5F0;
  --color-bg-sub:       #EDE9E2;
  --color-accent:       #7A9E82;
  --color-accent-hover: #5E8267;
  --color-text:         #3A3A3A;
  --color-text-sub:     #6F6A63;
  --color-text-light:   #979189;
  --color-border:       #D8D3CC;
  --color-white:        #FFFFFF;

  --font-serif:  'Noto Serif JP', serif;
  --font-sans:   'Noto Sans JP', sans-serif;
  --font-number: 'Cormorant Garamond', serif;

  --space-xs:  8px;
  --space-sm:  16px;
  --space-md:  32px;
  --space-lg:  64px;
  --space-xl:  96px;
  --space-2xl: 128px;

  --nav-h: 56px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Layout ===== */
.section-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.section-heading {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  transition: border-bottom 0.25s ease;
}

.nav.scrolled {
  border-bottom: 1px solid var(--color-border);
}

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

.nav-logo img {
  height: 32px;
  width: auto;
  filter: contrast(1.05);
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  padding: 14px 36px;
  border: none;
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.2s ease;
  text-align: center;
  line-height: 1;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

.btn-full {
  width: 100%;
  display: block;
}

.btn-outline {
  display: inline-block;
  background-color: transparent;
  color: var(--color-accent);
  padding: 14px 36px;
  border: 1px solid var(--color-accent);
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  text-align: center;
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.cta-wrap {
  margin-top: var(--space-md);
}

.cta-note {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: var(--space-xs);
  letter-spacing: 0.06em;
  text-align: center;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: var(--space-sm);
}

.form-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 400;
  color: var(--color-text-sub);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

/* required スパン（index.html: .required、LP: .req）*/
.form-label .required {
  color: var(--color-accent);
  margin-left: 4px;
  font-size: 0.75rem;
}

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

.form-input,
.form-textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 0;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 300;
  background: var(--color-white);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
  box-sizing: border-box;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-accent);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  color: #B05050;
  font-size: 0.84rem;
  margin-top: 4px;
  display: none;
}

.form-error.show {
  display: block;
}

.form-footer-note {
  font-size: 0.78rem;
  color: var(--color-text-light);
  text-align: center;
  margin-top: var(--space-sm);
}

/* ===== Footer ===== */
footer {
  background-color: var(--color-bg);
  border-top: 1px solid rgba(58,58,58,0.06);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}

.footer-logo {
  margin-bottom: var(--space-md);
}

.footer-logo img {
  width: 160px;
  height: auto;
  opacity: 0.92;
  filter: contrast(1.05);
  margin: 0 auto;
}

.footer-desc {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-bottom: var(--space-sm);
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.footer-nav {
  margin-bottom: var(--space-md);
}

.footer-nav a {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.footer-nav a:hover {
  color: var(--color-text);
}

/* ===== Fade-in ===== */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

/* ===== Responsive: nav ===== */
@media (max-width: 767px) {
  .nav {
    padding: 0 var(--space-sm);
  }

  .nav .btn-sm {
    font-size: 0.8rem;
    padding: 9px 14px;
  }
}