/* ========================================
   PLANU - common.css
   공통 스타일: 변수, 리셋, 타이포, 버튼, 유틸, 레이아웃
   ======================================== */

/* ── 1. CSS Variables (디자인 토큰) ── */
:root {
  /* Brand Colors */
  --color-navy:   #05213E;
  --color-red:    #ED2024;
  --color-blue:   #3957A7;
  --color-grey:   #BABAC4;
  --color-yellow: #FBAE17;

  /* Neutral */
  --color-white:        #FFFFFF;
  --color-black:        #0A0A0A;
  --color-bg-light:     #F8F9FA;
  --color-bg-grey:     #E6E8EA;
  --color-bg-section:   #F4F5F7;
  --color-text-primary: #1C1C2E;
  --color-text-sub:     #4A4A68;
  --color-text-muted:   #8B8BA0;
  --color-border:       #E4E4EF;

  /* Typography */
  --font-ko:  'Noto Sans KR', sans-serif;
  --font-en:  'Inter', sans-serif;

  --fs-xs:   0.75rem;   /* 12px */
  --fs-sm:   0.875rem;  /* 14px */
  --fs-base: 1rem;      /* 16px */
  --fs-md:   1.125rem;  /* 18px */
  --fs-lg:   1.25rem;   /* 20px */
  --fs-xl:   1.5rem;    /* 24px */
  --fs-2xl:  2rem;      /* 32px */
  --fs-3xl:  2.5rem;    /* 40px */
  --fs-4xl:  3rem;      /* 48px */

  /* Spacing */
  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  1.5rem;
  --sp-lg:  2rem;
  --sp-xl:  3rem;
  --sp-2xl: 4rem;
  --sp-3xl: 6rem;
  --sp-4xl: 8rem;

  /* Border Radius */
  --r-sm:   4px;
  --r-md:   8px;
  --r-lg:   16px;
  --r-xl:   24px;
  --r-2xl:  32px;
  --r-full: 9999px;

  /* Shadows */
  --sh-xs: 0 1px 3px rgba(5,33,62,0.06);
  --sh-sm: 0 2px 8px rgba(5,33,62,0.08);
  --sh-md: 0 6px 24px rgba(5,33,62,0.11);
  --sh-lg: 0 12px 40px rgba(5,33,62,0.14);
  --sh-xl: 0 24px 64px rgba(5,33,62,0.18);

  /* Transitions */
  --tr-fast: 0.15s ease;
  --tr-base: 0.25s ease;
  --tr-slow: 0.4s ease;

  /* Layout */
  --container: 1280px;
  --nav-h: 72px;
}

/* ── 2. Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-ko);
  font-size: var(--fs-base);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  line-height: 1.65;
  overflow-x: hidden;
}

img, video, svg { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ── 3. Typography ── */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.section-title {
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--color-navy);
}

/* ── 4. Layout ── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}

.section {
  padding: var(--sp-4xl) 0;
}

.section--sm  { padding: var(--sp-3xl) 0; }
.section--lg  { padding: 120px 0; }

/* ── 5. Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 40px;
  border-radius: var(--r-full);
  font-size: var(--fs-base);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--tr-base);
  white-space: nowrap;
  font-family: var(--font-ko);
}

.btn--primary {
  background-color: var(--color-blue);
  color: var(--color-white);
  border-color: var(--color-blue);
}
.btn--primary:hover {
  background-color: var(--color-navy);
  border-color: var(--color-navy);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-navy);
  border-color: var(--color-navy);
}
.btn--outline:hover {
  background-color: var(--color-navy);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn--outline-white {
  background-color: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.8);
}
.btn--outline-white:hover {
  background-color: var(--color-white);
  color: var(--color-navy);
  transform: translateY(-2px);
}

.btn--white {
  background-color: var(--color-white);
  color: var(--color-navy);
  border-color: var(--color-white);
}
.btn--white:hover {
  background-color: var(--color-yellow);
  border-color: var(--color-yellow);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

.btn--arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--color-navy);
  transition: gap var(--tr-base), color var(--tr-base);
  background: none;
  border: none;
  padding: 0;
}
.btn--arrow:hover { gap: 12px; color: var(--color-blue); }
.btn--arrow-white { color: rgba(255,255,255,0.85); }
.btn--arrow-white:hover { color: var(--color-white); gap: 12px; }

/* ── 6. Scroll Animations ── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

.fade-in {
  opacity: 0;
  transition: opacity 0.65s ease;
}
.fade-in.visible { opacity: 1; }

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* ── 7. Navigation ── */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  background-color: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--tr-base), box-shadow var(--tr-base);
}
#header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--sh-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-name {
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-navy);
  letter-spacing: 0.08em;
}
.logo-tagline {
  font-size: 9px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
}
.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-sub);
  position: relative;
  transition: color var(--tr-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background-color: var(--color-blue);
  transition: width var(--tr-base);
  border-radius: var(--r-full);
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-navy); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-cta {
  padding: 10px 22px;
  background-color: var(--color-navy);
  color: var(--color-white) !important;
  border-radius: var(--r-full);
  font-weight: 700 !important;
  font-family: var(--font-en);
  font-size: var(--fs-xs) !important;
  letter-spacing: 0.1em;
  transition: background-color var(--tr-fast) !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background-color: var(--color-blue) !important; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background-color: var(--color-navy);
  border-radius: 2px;
  transition: all var(--tr-base);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav panel */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--sh-md);
  z-index: 999;
  flex-direction: column;
  padding: var(--sp-sm) var(--sp-lg) var(--sp-md);
  gap: 2px;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--tr-base), opacity var(--tr-base);
}
.mobile-nav.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.mobile-nav a {
  padding: 14px 0;
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--tr-fast), padding-left var(--tr-fast);
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--color-blue); padding-left: 4px; }

/* ── 8. Contact Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(5,33,62,0.72);
  backdrop-filter: blur(5px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--tr-base), visibility var(--tr-base);
}
.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-white);
  border-radius: var(--r-2xl);
  padding: var(--sp-2xl);
  width: 100%;
  max-width: 520px;
  position: relative;
  transform: translateY(24px) scale(0.97);
  transition: transform var(--tr-base);
  box-shadow: var(--sh-xl);
}
.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 20px; right: 20px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background-color: var(--color-bg-section);
  color: var(--color-text-sub);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: none;
  transition: all var(--tr-fast);
}
.modal-close:hover {
  background-color: var(--color-border);
  color: var(--color-navy);
  transform: rotate(90deg);
}

.modal-head { margin-bottom: var(--sp-xl); }
.modal-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-blue);
  margin-bottom: 6px;
  font-family: var(--font-en);
}
.modal-head h3 {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 6px;
}
.modal-head p {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.form-group { margin-bottom: var(--sp-md); }
.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}
.form-label span { color: var(--color-red); }

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  font-size: var(--fs-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-light);
  outline: none;
  transition: border-color var(--tr-fast), background-color var(--tr-fast);
}
.form-input:focus {
  border-color: var(--color-blue);
  background-color: var(--color-white);
}
.form-input::placeholder { color: var(--color-text-muted); }
textarea.form-input { resize: vertical; min-height: 100px; }

.form-submit {
  width: 100%;
  padding: 16px;
  background-color: var(--color-navy);
  color: var(--color-white);
  border: none;
  border-radius: var(--r-md);
  font-size: var(--fs-base);
  font-weight: 700;
  cursor: pointer;
  margin-top: var(--sp-sm);
  transition: all var(--tr-base);
  font-family: var(--font-ko);
}
.form-submit:hover {
  background-color: var(--color-blue);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}

.form-msg {
  font-size: var(--fs-sm);
  text-align: center;
  margin-top: var(--sp-xs);
  min-height: 20px;
}
.form-msg.error { color: var(--color-red); }
.form-msg.success { color: #16a34a; }

/* ── 9. Footer ── */
#footer {
  background-color: var(--color-navy);
  padding: var(--sp-2xl) 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-md);
}
.footer-logo .logo-name { color: var(--color-white); }
.footer-logo .logo-tagline { color: rgba(255,255,255,0.45); }
.footer-links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
  flex-wrap: wrap;
}
.footer-links a {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  font-family: var(--font-en);
  transition: color var(--tr-fast);
}
.footer-links a:hover { color: var(--color-white); }
.footer-copy {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.35);
  font-family: var(--font-en);
}

/* ── 10. Responsive (공통) ── */
@media (max-width: 1024px) {
  .section-title { font-size: var(--fs-2xl); }
  .section { padding: var(--sp-3xl) 0; }
}

@media (max-width: 768px) {
  :root { --nav-h: 64px; }

  .nav-links { display: none; }
  .hamburger { display: flex; }

  .section-title { font-size: var(--fs-xl); }
  .section, .section--sm { padding: var(--sp-2xl) 0; }
  .section--lg { padding: var(--sp-3xl) 0; }

  .container { padding: 0 var(--sp-sm); }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: var(--sp-md); }
  .footer-links { flex-direction: column; align-items: flex-start; gap: var(--sp-xs); }

  .modal { padding: var(--sp-lg); border-radius: var(--r-xl); }
}

@media (max-width: 480px) {
  .btn { padding: 13px 22px; font-size: var(--fs-xs); }
}