/* ══ EUNACLASS Common Styles ══ */

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

/* ── Accessibility: Skip Link ── */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: #5ae4d0;
  color: #040a2f;
  text-decoration: none;
  font-family: 'Manrope', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: 0 0 8px 8px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; outline: 2px solid #fff; outline-offset: 2px; }

/* ── Accessibility: Focus Visible (keyboard users) ── */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid #5ae4d0;
  outline-offset: 2px;
  border-radius: 4px;
}
html.light a:focus-visible,
html.light button:focus-visible,
html.light input:focus-visible,
html.light textarea:focus-visible,
html.light [tabindex]:focus-visible {
  outline-color: #0d9488;
}

:root {
  --color-bg: #040a2f;
  --color-surface: #121b4c;
  --color-surface-hover: #1d2760;
  --color-surface-dim: #070f38;
  --color-surface-high: #172056;
  --color-text: #e2e3ff;
  --color-text-muted: #a3a8d5;
  --color-primary: #af88ff;
  --color-primary-dim: #8a4cfc;
  --color-primary-deep: #6001d1;
  --color-on-primary: #2b0065;
  --color-tertiary: #a1ffef;
  --color-tertiary-dim: #5ae4d0;
  --color-border: #3f456c;
  --color-outline: #6d739d;
  --color-practice: #fbbf24;
  --color-level-beginner: #5de7d3;
  --color-level-basic: #af88ff;
  --color-level-advanced: #ff716c;
  --font-headline: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-label: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3.5rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

html { scroll-behavior: smooth; scroll-padding-top: 52px; }

/* Page fade-in */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.page-content { animation: fadeIn 0.4s ease both; }

/* 입력 필드는 항상 선택 허용 */
input, textarea { -webkit-user-select: text !important; -moz-user-select: text !important; user-select: text !important; }

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

::selection { background: var(--color-tertiary); color: #005b51; }
[hidden] { display: none !important; }

/* ── Navigation ── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  max-width: 1080px;
  margin: 0 auto;
}

.nav__logo {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-text);
  text-decoration: none;
  text-transform: uppercase;
}

.nav__logo:hover { color: var(--color-text); }

.nav__links {
  display: flex;
  gap: var(--space-lg);
}

.nav__link {
  font-family: var(--font-label);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-outline);
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* Burger button - hidden on desktop */
.nav__burger { display: none; background: none; border: none; font-size: 1.4rem; color: var(--color-text-muted); cursor: pointer; padding: 0.25rem; }
.nav__burger:hover { color: var(--color-text); }

.nav__link:hover { color: var(--color-text); }
.nav__link--active { color: var(--color-tertiary-dim); border-bottom: 2px solid var(--color-tertiary-dim); padding-bottom: 2px; }

/* ── Password Gate ── */
.gate {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding-bottom: 6vh;
  background: radial-gradient(ellipse at 50% 30%, rgba(18, 27, 76, 0.8) 0%, var(--color-bg) 70%);
}

.gate__box { text-align: center; padding: var(--space-2xl); max-width: 460px; width: 100%; }
.gate__logo { margin-bottom: var(--space-md); opacity: 0.8; }
.gate__brand { font-family: 'Playfair Display', Georgia, serif; font-size: 0.85rem; font-weight: 700; letter-spacing: 0.2em; color: var(--color-text-muted); text-transform: uppercase; margin-bottom: var(--space-3xl); }
.gate__caption { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--font-label); font-size: 0.65rem; font-weight: 500; letter-spacing: 0.15em; color: var(--color-outline); text-transform: uppercase; margin-bottom: var(--space-xl); }
.gate__caption::before { content:''; display:inline-block; width:12px; height:12px; background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236d739d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'/%3E%3Cpath d='M7 11V7a5 5 0 0 1 10 0v4'/%3E%3C/svg%3E"); background-size:contain; }
.gate__title { font-family: var(--font-headline); font-size: 1.6rem; font-weight: 600; color: var(--color-text); line-height: 1.4; letter-spacing: -0.02em; margin-bottom: var(--space-lg); }
.gate__accent { color: var(--color-tertiary); }
.gate__subdesc { font-family: var(--font-body); font-size: var(--font-size-sm); color: var(--color-outline); line-height: 1.8; margin-bottom: var(--space-2xl); }
.gate__form { display: flex; gap: 0.625rem; margin-bottom: var(--space-md); max-width: 360px; margin-left: auto; margin-right: auto; }
.gate__input { flex: 1; height: 48px; padding: 0 1.25rem; font-family: var(--font-body); font-size: var(--font-size-sm); color: var(--color-text); background: rgba(18,27,76,0.5); border: 1px solid rgba(63,69,108,0.4); border-radius: var(--radius-lg); outline: none; transition: border-color var(--transition-fast); }
.gate__input::placeholder { color: rgba(109,115,157,0.6); }
.gate__input:focus { border-color: rgba(175,136,255,0.5); }
.gate__btn { height: 48px; padding: 0 1.5rem; font-family: var(--font-headline); font-size: var(--font-size-sm); font-weight: 600; color: #fff; background: var(--color-primary-dim); border: none; border-radius: var(--radius-lg); cursor: pointer; transition: background var(--transition-fast); white-space: nowrap; }
.gate__btn:hover { background: var(--color-primary); }
.gate__error { font-size: 0.75rem; color: var(--color-level-advanced); margin-bottom: var(--space-sm); }
.gate__footer { display: flex; justify-content: center; align-items: center; gap: var(--space-md); margin-top: var(--space-3xl); font-family: var(--font-label); font-size: 0.7rem; font-weight: 400; color: rgba(109,115,157,0.5); letter-spacing: 0.02em; }
.gate__dot { width: 2px; height: 2px; border-radius: 50%; background: rgba(109,115,157,0.4); }

/* ── Footer ── */
.footer { text-align: center; padding: var(--space-xl) var(--space-lg); border-top: 1px solid rgba(63,69,108,0.25); margin-top: var(--space-3xl); background: rgba(2,6,24,0.5); }
.footer__line { font-family: var(--font-label); font-size: 0.8rem; color: rgba(109,115,157,0.6); letter-spacing: 0.01em; }
.footer__sep { margin: 0 0.5rem; opacity: 0.4; }
.footer__link { color: rgba(109,115,157,0.6); text-decoration: none; transition: color var(--transition-fast); }
.footer__link:hover { color: var(--color-tertiary-dim); }
.footer__nav { font-family: var(--font-label); font-size: 0.85rem; letter-spacing: 0.02em; margin-bottom: 0.75rem; }
.footer__nav .footer__link { color: rgba(180,188,220,0.85); font-weight: 500; }
.footer__nav .footer__link:hover { color: var(--color-tertiary); }

/* ── FAB Buttons ── */
.fab { position: fixed; bottom: var(--space-xl); right: var(--space-xl); z-index: 90; display: flex; flex-direction: column; gap: var(--space-sm); }
.fab__btn { position: relative; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; border: none; border-radius: 50%; cursor: pointer; transition: transform var(--transition-fast), box-shadow var(--transition-fast); }
.fab__btn:hover { transform: translateY(-2px); }
.fab__btn--home { color: #fff; background: rgba(109,115,157,0.7); backdrop-filter: blur(8px); }
.fab__btn--home:hover { background: rgba(109,115,157,0.9); box-shadow: 0 4px 12px rgba(0,0,0,0.2); }
.fab__btn--dark { color: #fff; background: rgba(109,115,157,0.7); backdrop-filter: blur(8px); }
.fab__btn--dark:hover { background: rgba(109,115,157,0.9); box-shadow: 0 4px 12px rgba(0,0,0,0.2); }
.fab__btn--top { color: #fff; background: #2563eb; }
.fab__btn--top:hover { background: #1d4ed8; box-shadow: 0 4px 12px rgba(37,99,235,0.3); }

/* FAB Tooltip */
.fab__btn::after {
  content: attr(data-tooltip);
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  padding: 0.35rem 0.75rem;
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}
.fab__btn:hover::after { opacity: 1; }

/* ── Light Mode ── */
html.light {
  --color-bg: #f5f6fa;
  --color-surface: #ffffff;
  --color-surface-hover: #edf0f5;
  --color-surface-dim: #e8eaef;
  --color-surface-high: #f0f1f6;
  --color-text: #1a1d2e;
  --color-text-muted: #4a5068;
  --color-primary: #7c4dff;
  --color-primary-dim: #6234cc;
  --color-primary-deep: #4a1fa6;
  --color-on-primary: #ffffff;
  --color-tertiary: #0d9488;
  --color-tertiary-dim: #0f766e;
  --color-border: #d4d8e3;
  --color-outline: #8890a8;
  --color-ai: #7c4dff;
  --color-prompt: #4a5068;
  --color-tools: #0d9488;
  --color-practice: #d97706;
  --color-level-beginner: #059669;
  --color-level-basic: #7c4dff;
  --color-level-advanced: #dc2626;
  --color-card-bg: rgba(255, 255, 255, 0.85);
  --color-card-border: rgba(212, 216, 227, 0.8);
}

html.light ::selection { background: #7c4dff; color: #fff; }
/* Gate always stays dark regardless of theme */
.gate { --color-bg: #040a2f; --color-text: #e2e3ff; --color-text-muted: #a3a8d5; --color-border: #3f456c; --color-outline: #6d739d; --color-primary: #af88ff; --color-primary-dim: #8a4cfc; --color-tertiary: #a1ffef; --color-tertiary-dim: #5ae4d0; }
html.light .nav__logo { color: var(--color-text); }
html.light .nav__link { color: var(--color-text-muted); }
html.light .nav__link:hover { color: #1a1d2e; }
html.light .nav__link--active { color: #0d9488; border-bottom-color: #0d9488; }
html.light .footer { background: rgba(235, 237, 245, 0.8); border-color: var(--color-border); }
html.light .footer__line { color: var(--color-text-muted); }
html.light .footer__link { color: var(--color-text-muted); }
html.light .footer__link:hover { color: var(--color-tertiary); }
html.light .footer__nav .footer__link { color: var(--color-text); }
html.light .footer__nav .footer__link:hover { color: var(--color-tertiary); }
html.light .fab__btn--home, html.light .fab__btn--dark { background: #fff; color: var(--color-text); border: 1px solid var(--color-border); box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
html.light .fab__btn--home:hover, html.light .fab__btn--dark:hover { background: #f5f6fa; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
html.light .fab__btn--top { background: var(--color-primary); }
html.light .fab__btn::after { background: #fff; border-color: var(--color-border); color: var(--color-text); box-shadow: 0 2px 8px rgba(0,0,0,0.08); }

/* ── Responsive Common ── */
@media (max-width: 480px) {
  .gate { padding-bottom: 2vh; }
  .gate__box { padding: var(--space-xl) var(--space-lg); }
  .gate__title { font-size: 1.3rem; }
  .gate__form { flex-direction: column; max-width: 100%; }
  .nav { padding: var(--space-md); flex-wrap: wrap; }
  .nav__burger { display: block; }
  .nav__links { display: none; width: 100%; flex-direction: column; gap: var(--space-sm); padding-top: var(--space-md); border-top: 1px solid var(--color-border); margin-top: var(--space-sm); }
  .nav__links--open { display: flex; }
  .nav__link { font-size: var(--font-size-sm); padding: var(--space-sm) 0; }
  .footer__line { font-size: 0.7rem; }
  .footer__sep { display: none; }
  .footer__line { display: flex; flex-direction: column; gap: 0.25rem; }
}