@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&family=DM+Sans:wght@400;500&display=swap');

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

:root {
  --red: #C41B1B;
  --red-light: #FAEAEA;
  --red-dark: #961414;
  --green-light: #EAF3DE;
  --green-dark: #3B6D11;
  --amber-light: #FAEEDA;
  --amber-dark: #854F0B;
  --gray-bg: #F7F6F3;
  --gray-border: #E5E3DC;
  --text-primary: #1A1916;
  --text-secondary: #6B6860;
  --text-muted: #9E9C97;
  --white: #FFFFFF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 99px;
}

body {
  font-family: 'DM Sans', 'Noto Sans JP', sans-serif;
  color: var(--text-primary);
  background: var(--white);
  line-height: 1.6;
  font-size: 15px;
}

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

/* NAV */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 40px;
  border-bottom: 1px solid var(--gray-border);
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-logo { display: flex; align-items: center; }
.nav-logo-img {
  height: 36px;
  width: auto;
  display: block;
  border-radius: 6px;
}
[data-theme="dark"] .nav-logo-img {
  background: #fff;
  padding: 3px 8px;
  border-radius: 6px;
}
.nav-links { display: flex; gap: 28px; font-size: 14px; color: var(--text-secondary); }
.nav-links a:hover { color: var(--red); }
.nav-right { display: flex; align-items: center; gap: 10px; }
.social-icons { display: flex; gap: 7px; margin-right: 4px; }
.social-icon {
  width: 30px; height: 30px;
  border-radius: 6px;
  border: 1.5px solid var(--red);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background 0.15s;
}
.social-icon:hover { background: var(--red-light); }
.social-icon svg { width: 13px; height: 13px; fill: var(--red); }

/* BUTTONS */
.btn { cursor: pointer; font-family: inherit; font-weight: 500; transition: all 0.15s; }
.btn-primary {
  background: var(--red); color: var(--white);
  border: none; padding: 10px 22px;
  border-radius: var(--radius-pill); font-size: 14px;
}
.btn-primary:hover { background: var(--red-dark); }
.btn-login {
  background: transparent; color: var(--red);
  border: 1.5px solid var(--red); padding: 9px 20px;
  border-radius: var(--radius-pill); font-size: 14px;
}
.btn-login:hover { background: var(--red-light); }
.btn-outline {
  background: transparent; color: var(--red);
  border: 1.5px solid var(--red); padding: 10px 24px;
  border-radius: var(--radius-sm); font-size: 14px;
}
.btn-outline:hover { background: var(--red-light); }

/* BADGES */
.badge {
  display: inline-block; font-size: 11px; font-weight: 500;
  padding: 3px 10px; border-radius: var(--radius-pill);
}
.badge-free { background: var(--green-light); color: var(--green-dark); }
.badge-premium { background: var(--amber-light); color: var(--amber-dark); }
.badge-locked { background: #EDEDEA; color: var(--text-muted); }

/* ── HAMBURGER ────────────────────────────────────────── */
.btn-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 32px;
  height: 32px;
}
.btn-hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.2s;
  transform-origin: center;
}
.btn-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.btn-hamburger.open span:nth-child(2) { opacity: 0; }
.btn-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── MOBILE NAV ───────────────────────────────────────── */
@media (max-width: 680px) {
  .nav { padding: 12px 16px; }

  .btn-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-border);
    flex-direction: column;
    padding: 16px 20px 20px;
    gap: 0;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-border);
    font-size: 15px;
    color: var(--text-primary);
  }
  .nav-links a:last-of-type { border-bottom: none; }

  .nav-social-desktop { display: none; }
  .nav-social-mobile  { display: flex; margin-top: 16px; }

  .nav-auth-desktop { display: none; }
  .nav-auth-mobile  { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

  [data-theme="dark"] .nav-links {
    background: #1A1917;
    border-color: var(--gray-border);
  }
}

@media (min-width: 681px) {
  .nav-social-mobile { display: none; }
  .nav-auth-mobile   { display: none; }
}

/* FOOTER */
.footer {
  padding: 24px 40px;
  border-top: 1px solid var(--gray-border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* ── DARK MODE TOGGLE BUTTON ──────────────────────────── */
.btn-theme {
  background: transparent;
  border: 1.5px solid var(--gray-border);
  border-radius: var(--radius-pill);
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.btn-theme:hover { border-color: var(--red); color: var(--red); }
.btn-theme svg { width: 16px; height: 16px; pointer-events: none; }
.btn-theme .icon-moon { fill: currentColor; stroke: none; }
.btn-theme .icon-sun  { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }

/* ── DARK MODE ─────────────────────────────────────────── */
[data-theme="dark"] {
  --red-light: #2A0808;
  --gray-bg: #161513;
  --gray-border: #2E2C27;
  --text-primary: #EDEAE4;
  --text-secondary: #A5A39D;
  --text-muted: #706E69;
  --green-light: #12211A;
  --green-dark: #6FCF97;
  --amber-light: #221A08;
  --amber-dark: #F2C06A;
}

[data-theme="dark"] body {
  background: #121210;
  color: var(--text-primary);
}

[data-theme="dark"] .nav {
  background: #1A1917;
  border-color: var(--gray-border);
}

[data-theme="dark"] .feature-card,
[data-theme="dark"] .level-card,
[data-theme="dark"] .testimonial-card,
[data-theme="dark"] .hero-stats,
[data-theme="dark"] .path-circle {
  background: #1E1C19;
  border-color: var(--gray-border);
}

[data-theme="dark"] .badge-locked {
  background: #2A2925;
  color: var(--text-muted);
}

[data-theme="dark"] .level-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

[data-theme="dark"] .feature-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
}

[data-theme="dark"] .hero-stats {
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

[data-theme="dark"] .hero-stat {
  border-color: var(--gray-border);
}

[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
  background: #1E1C19;
  color: var(--text-primary);
  border-color: var(--gray-border);
}
[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
  color: var(--text-muted);
}

[data-theme="dark"] .auth-card {
  background: #1E1C19;
  border-color: var(--gray-border);
}
[data-theme="dark"] .google-btn {
  background: #1E1C19;
  color: var(--text-primary);
  border-color: var(--gray-border);
}
[data-theme="dark"] .google-btn:hover { background: #252320; }