/* MoneySynapse Modern Responsive Stylesheet */
:root {
  /* Brand Color Palette */
  --ms-primary: #4F6EF7;
  --ms-primary-hover: #3D5CE5;
  --ms-primary-glow: rgba(79, 110, 247, 0.35);
  
  --ms-bg-base: #0A0E1A;
  --ms-bg-surface: #111827;
  --ms-bg-surface-elevated: #1E293B;
  --ms-bg-glass: rgba(17, 24, 39, 0.85);
  --ms-border: rgba(255, 255, 255, 0.1);
  --ms-border-focus: rgba(79, 110, 247, 0.8);

  --ms-text-primary: #F9FAFB;
  --ms-text-secondary: #9CA3AF;
  --ms-text-muted: #6B7280;

  /* Status Colors */
  --ms-status-income: #1F8A4C;
  --ms-status-expense: #C23B4B;
  --ms-status-savings: #16806B;
  --ms-status-invest: #2A5FD6;
  --ms-status-loan: #A15C1E;
  --ms-status-moa: #8B5CF6;
  --ms-status-wish: #EC4899;
  --ms-status-budget: #B9770E;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Pretendard Variable", Pretendard, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html, body {
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  background-color: var(--ms-bg-base);
  color: var(--ms-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--ms-primary);
  outline-offset: 2px;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ms-bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--ms-border);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 4px 12px var(--ms-primary-glow);
}

.brand-title {
  background: linear-gradient(135deg, #FFFFFF 0%, #D1D5DB 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--ms-text-secondary);
  font-weight: 500;
  padding: 8px 0;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #FFFFFF;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Language Switcher */
.lang-switcher {
  display: inline-flex;
  background: var(--ms-bg-surface-elevated);
  border: 1px solid var(--ms-border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--ms-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 12px;
  min-height: 36px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: var(--ms-primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px var(--ms-primary-glow);
}

/* Primary Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ms-primary);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.95rem;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--ms-primary-glow);
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--ms-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--ms-primary-glow);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--ms-text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: 10px;
  border: 1px solid var(--ms-border);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.2);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--ms-text-primary);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 72px 0 96px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 450px;
  background: radial-gradient(circle, rgba(79, 110, 247, 0.18) 0%, rgba(10, 14, 26, 0) 70%);
  filter: blur(60px);
  z-index: 0;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(79, 110, 247, 0.12);
  border: 1px solid rgba(79, 110, 247, 0.3);
  color: #818CF8;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #FFFFFF 0%, #D1D5DB 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--ms-text-secondary);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
}

/* Auth Card */
.auth-card {
  background: var(--ms-bg-surface);
  border: 1px solid var(--ms-border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  position: relative;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--ms-border);
  margin-bottom: 24px;
}

.auth-tab {
  flex: 1;
  text-align: center;
  padding: 12px;
  min-height: 44px;
  background: transparent;
  border: none;
  color: var(--ms-text-muted);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.auth-tab.tab-active {
  color: #FFFFFF;
  border-bottom-color: var(--ms-primary);
}

.auth-alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.auth-alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #FCA5A5;
}

.auth-alert-success {
  background: rgba(31, 138, 76, 0.15);
  border: 1px solid rgba(31, 138, 76, 0.3);
  color: #86EFAC;
}

.auth-alert-info {
  background: rgba(79, 110, 247, 0.15);
  border: 1px solid rgba(79, 110, 247, 0.3);
  color: #93C5FD;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ms-text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  min-height: 44px;
  background: var(--ms-bg-base);
  border: 1px solid var(--ms-border);
  border-radius: 8px;
  color: #FFFFFF;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--ms-primary);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.2);
}

.btn-submit {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  margin-top: 8px;
}

.oauth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 20px 0;
  color: var(--ms-text-muted);
  font-size: 0.8rem;
}

.oauth-divider::before,
.oauth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--ms-border);
}

.oauth-divider span {
  padding: 0 12px;
}

.oauth-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-oauth {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 12px;
  min-height: 44px;
  background: var(--ms-bg-surface-elevated);
  border: 1px solid var(--ms-border);
  border-radius: 8px;
  color: var(--ms-text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-oauth:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.oauth-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Logged In State Box */
.auth-logged-in-box {
  text-align: center;
  padding: 24px 8px;
}

.auth-logged-in-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: rgba(79, 110, 247, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ms-primary);
  font-size: 1.8rem;
}

.auth-user-email {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 6px;
  word-break: break-all;
}

/* Brand Showcase Section */
.brand-showcase-section {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--ms-bg-base) 0%, #0d1222 50%, var(--ms-bg-base) 100%);
  position: relative;
  border-top: 1px solid var(--ms-border);
  border-bottom: 1px solid var(--ms-border);
}

.brand-showcase-banner {
  background: radial-gradient(circle at 50% 30%, rgba(79, 110, 247, 0.15) 0%, rgba(17, 24, 39, 0.8) 70%);
  border: 1px solid var(--ms-border);
  border-radius: 28px;
  padding: 64px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.brand-showcase-artwork {
  max-width: 480px;
  width: 100%;
  height: auto;
  border-radius: 20px;
  margin-bottom: 36px;
  filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.6));
  transition: transform 0.4s ease;
}

.brand-showcase-artwork:hover {
  transform: scale(1.02);
}

.brand-showcase-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.brand-showcase-desc {
  font-size: 1.15rem;
  color: var(--ms-text-secondary);
  max-width: 680px;
  margin-bottom: 32px;
}

/* Feature Pillars Grid */
.features-section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--ms-text-secondary);
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--ms-bg-surface);
  border: 1px solid var(--ms-border);
  border-radius: 16px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.feature-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tag-income { background: rgba(31, 138, 76, 0.2); color: #34D399; }
.tag-savings { background: rgba(22, 128, 107, 0.2); color: #2DD4BF; }
.tag-wish { background: rgba(236, 72, 153, 0.2); color: #F472B6; }
.tag-budget { background: rgba(185, 119, 14, 0.2); color: #FBBF24; }
.tag-assets { background: rgba(79, 110, 247, 0.2); color: #93C5FD; }
.tag-loan { background: rgba(161, 92, 30, 0.2); color: #F97316; }
.tag-invest { background: rgba(42, 95, 214, 0.2); color: #60A5FA; }
.tag-moa { background: rgba(139, 92, 246, 0.2); color: #C084FC; }

.feature-card-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.feature-card-desc {
  font-size: 0.9rem;
  color: var(--ms-text-secondary);
  line-height: 1.5;
}

/* Modal Dialog (App Status) */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-dialog {
  background: var(--ms-bg-surface);
  border: 1px solid var(--ms-border);
  border-radius: 20px;
  max-width: 520px;
  width: 100%;
  padding: 32px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: modalFadeIn 0.25s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(79, 110, 247, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--ms-primary);
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.modal-desc {
  font-size: 0.95rem;
  color: var(--ms-text-secondary);
  line-height: 1.6;
  white-space: pre-line;
  margin-bottom: 16px;
}

.modal-subdesc {
  font-size: 0.85rem;
  color: var(--ms-text-muted);
  border-top: 1px solid var(--ms-border);
  padding-top: 14px;
  margin-bottom: 24px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Footer */
.footer {
  background: var(--ms-bg-surface);
  border-top: 1px solid var(--ms-border);
  padding: 64px 0 40px;
  color: var(--ms-text-secondary);
  font-size: 0.9rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.footer-links {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-column-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.footer-link {
  color: var(--ms-text-secondary);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-notice {
  font-size: 0.8rem;
  color: var(--ms-text-muted);
  border-top: 1px solid var(--ms-border);
  padding-top: 24px;
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  font-size: 0.8rem;
  color: var(--ms-text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 2.6rem;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--ms-bg-surface-elevated);
    border-bottom: 1px solid var(--ms-border);
    padding: 24px;
    gap: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .brand-showcase-title {
    font-size: 1.8rem;
  }

  .brand-showcase-banner {
    padding: 40px 20px;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
  }

  .modal-actions {
    flex-direction: column;
  }

  .modal-actions button, .modal-actions a {
    width: 100%;
    text-align: center;
  }
}