/* ==========================================================================
   DESIGN SYSTEM: Serene Grace (세련된 은혜)
   Custom CSS for contemporary Korean church digital bulletin
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Root Variables & Theme Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand Palette (Sage Green Spectrum) */
  --color-primary: #3f6355;
  --color-on-primary: #ffffff;
  --color-primary-container: #587c6d;
  --color-on-primary-container: #f5fff8;
  --color-inverse-primary: #a8cfbd;
  
  --color-secondary: #486456;
  --color-on-secondary: #ffffff;
  --color-secondary-container: #caead8;
  --color-on-secondary-container: #4e6b5c;

  --color-tertiary: #4b605c;
  --color-on-tertiary: #ffffff;
  --color-tertiary-container: #637975;
  --color-on-tertiary-container: #f4fffc;

  /* Neutral Surface Colors */
  --color-background: #f7faf9;
  --color-on-background: #181c1c;
  --color-surface: #f7faf9;
  --color-on-surface: #181c1c;
  --color-on-surface-variant: #414844;
  
  /* Elevational Surfaces */
  --color-surface-lowest: #ffffff; /* Card backgrounds */
  --color-surface-low: #f1f4f3;
  --color-surface-container: #ebeeed;
  --color-surface-high: #e6e9e8;
  --color-surface-highest: #e0e3e2;

  /* Validation & Alerts */
  --color-error: #ba1a1a;
  --color-on-error: #ffffff;
  --color-error-container: #ffdad6;
  --color-on-error-container: #93000a;
  --color-success: #2e7d32;

  /* Borders & Outlines */
  --color-outline: #717974;
  --color-outline-variant: #c1c8c3;

  /* Typography Fonts */
  --font-headline: 'Gowun Dodum', sans-serif;
  --font-body: 'Gowun Batang', serif;

  /* Spacing Grid (4px/8px base system) */
  --spacing-margin-page: 20px;
  --spacing-gutter-card: 16px;
  --spacing-stack-gap: 36px;
  --spacing-card-pad: 24px;

  /* Border Radii */
  --radius-sm: 0.25rem;     /* 4px */
  --radius-md: 0.75rem;     /* 12px */
  --radius-lg: 1rem;       /* 16px */
  --radius-xl: 1.5rem;      /* 24px */
  --radius-full: 9999px;

  /* Elevation Shadows */
  --shadow-level-1: 0 8px 24px rgba(107, 144, 128, 0.06), 0 2px 6px rgba(107, 144, 128, 0.04);
  --shadow-level-2: 0 12px 32px rgba(107, 144, 128, 0.12), 0 4px 12px rgba(107, 144, 128, 0.06);
  --shadow-inset-1: inset 0 2px 4px rgba(0, 0, 0, 0.05);

  /* Animation Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. Global Reset & Base Styles
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-on-background);
  background-color: var(--color-background);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface-low);
}
::-webkit-scrollbar-thumb {
  background: var(--color-outline-variant);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-outline);
}

/* App Container Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  max-width: 480px; /* Default mobile view centered on desktop */
  margin: 0 auto;
  background-color: var(--color-background);
  background-image: linear-gradient(to bottom, #d1ded9 0%, #e8f0ed 150px, #f7faf9 350px);
  background-repeat: no-repeat;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.03);
}

/* --------------------------------------------------------------------------
   3. Header Styling
   -------------------------------------------------------------------------- */
.app-header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  z-index: 100;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  padding: 12px var(--spacing-margin-page);
  height: 56px;
  transition: height var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.app-header.header-large {
  height: 140px;
}

/* Header scrolled state (solid background) */
.app-header.header-scrolled {
  background-color: rgba(247, 250, 249, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-outline-variant);
  box-shadow: var(--shadow-level-1);
}

/* Header dark state on Worship tab top */
.app-header.header-transparent-dark .brand-name {
  color: #ffffff;
}

.app-header.header-transparent-dark .brand-sub {
  color: rgba(255, 255, 255, 0.8);
}

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

/* Logo styling */
.header-brand {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: left var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1), 
              transform var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1), 
              gap var(--transition-normal),
              top var(--transition-normal);
}

.app-header:not(.header-large) .header-brand {
  left: 0;
  transform: translate(0, -50%);
  gap: 10px;
}

.church-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: #ffffff;
  border: 1.5px solid var(--color-outline-variant);
  object-fit: cover;
  filter: drop-shadow(0 2px 4px rgba(63, 99, 85, 0.12));
  animation: logo-pulse 8s infinite ease-in-out;
  transition: width var(--transition-normal), height var(--transition-normal), border-color var(--transition-normal);
}

.app-header.header-large .church-logo {
  width: 52px;
  height: 52px;
  border-width: 2px;
  border-color: #ffffff;
}

.brand-text-wrapper {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-headline);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  transition: font-size var(--transition-normal), color var(--transition-normal);
}

.app-header.header-large .brand-name {
  font-size: 26px;
}

.brand-sub {
  display: none; /* Hidden on mobile to match style requirements */
}

/* Navigation tabs in Header (Desktop only) */
.desktop-nav {
  display: none; /* Mobile first */
}

/* Header Utilities */
.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-on-surface-variant);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-surface-container);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   4. Main Contents & Transitions
   -------------------------------------------------------------------------- */
.app-main {
  flex-grow: 1;
  padding: var(--spacing-stack-gap) var(--spacing-margin-page) 100px var(--spacing-margin-page); /* Extra bottom padding for nav */
  position: relative;
}

.tab-content {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-slow) ease-out, transform var(--transition-slow) ease-out;
  padding-top: 140px; /* Space for large mobile header */
}

#tab-worship.tab-content {
  padding-top: 0; /* Worship tab bleeds behind transparent header, no spacer needed */
}

.tab-content.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.grid-layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-stack-gap);
}

.two-col-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--spacing-stack-gap);
}

.section-main-title {
  font-family: var(--font-headline);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-on-background);
  margin-bottom: 8px;
  position: relative;
  display: inline-block;
}

.section-main-title::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 24px;
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
}

.section-subtitle {
  font-size: 14px;
  color: var(--color-on-surface-variant);
  margin-bottom: 24px;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   5. Standard Card Layout & Typography
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-surface-lowest);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-level-1);
  padding: var(--spacing-card-pad);
  border: 1px solid rgba(107, 144, 128, 0.05);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: keep-all;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-level-2);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.card-header-icon {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-title {
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   6. TAB 1: 예배 (Worship) Details
   -------------------------------------------------------------------------- */
/* Hero Banner */
.hero-banner {
  position: relative;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  overflow: hidden;
  background: linear-gradient(135deg, #1f362b 0%, #3a5c4f 50%, #4a7565 100%);
  padding: 150px 24px 40px 24px; /* Generous top padding for header space */
  margin-top: calc(var(--spacing-stack-gap) * -1); /* Cancel main container top margin */
  margin-left: calc(var(--spacing-margin-page) * -1); /* Cancel main container left margin */
  margin-right: calc(var(--spacing-margin-page) * -1); /* Cancel main container right margin */
  margin-bottom: var(--spacing-stack-gap);
  box-shadow: var(--shadow-level-1);
  color: #ffffff;
}

/* Abstract Wavy Glowing background inside Hero */
.hero-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background: radial-gradient(circle at 70% 30%, rgba(196, 235, 217, 0.25) 0%, transparent 60%);
  filter: blur(30px);
  pointer-events: none;
}

.hero-banner::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3%3Cpath fill='%23587c6d' fill-opacity='0.15' d='M0,192L80,192C160,192,320,192,480,181.3C640,171,800,149,960,154.7C1120,160,1280,192,1360,208L1440,224L1440,320L1360,320C1280,320,1120,320,960,320C800,320,640,320,480,320C320,320,160,320,80,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
  background-size: cover;
  opacity: 0.8;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 500;
  background-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  letter-spacing: 0.05em;
  color: #ffffff;
}

.hero-title {
  font-family: var(--font-headline);
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 15px;
  opacity: 0.85;
  margin-bottom: 24px;
}

.video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
  background-color: #000;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-cover {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.video-cover::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.2);
  transition: background 0.3s ease;
  z-index: 1;
}

.video-cover:hover::after {
  background: rgba(0, 0, 0, 0.35);
}

.video-play-btn {
  position: relative;
  z-index: 2;
  width: 64px;
  height: 64px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.video-play-btn svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
  transition: transform 0.3s ease;
}

.video-cover:hover .video-play-btn {
  transform: scale(1.12);
  background: #ffffff;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

/* Scripture Card */
.scripture-meta {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
  background-color: var(--color-surface-low);
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.scripture-quote {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-on-surface-variant);
  border-left: 3px solid var(--color-inverse-primary);
  padding-left: 14px;
  margin-left: 2px;
  text-align: justify;
}

/* Order of Worship Card */
.order-list {
  list-style: none;
}

.order-list li {
  display: flex;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px dashed var(--color-outline-variant);
}

.order-list li:last-child {
  border-bottom: none;
}

.order-item {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-on-surface);
  flex-shrink: 0;
}

.order-divider {
  flex-grow: 1;
  margin: 0 16px;
}

.order-leader {
  font-size: 14px;
  color: var(--color-on-surface-variant);
  flex-shrink: 0;
}

.highlight-text {
  color: var(--color-primary);
  font-weight: 700;
}

/* Sermon Notes Card */
.notes-sermon-title {
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.notes-sermon-verse {
  font-size: 12px;
  color: var(--color-on-surface-variant);
  margin-bottom: 20px;
}

.notes-fill-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.notes-fill-item {
  display: flex;
  gap: 8px;
}

.notes-fill-item .bullet {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 2px;
}

.fill-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-on-surface-variant);
}

.input-blank-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0 4px;
}

/* Ghost line input style for notebook look */
.ghost-input {
  border: none;
  border-bottom: 2px solid var(--color-outline-variant);
  background: transparent;
  width: 90px;
  padding: 0 8px;
  text-align: center;
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  border-radius: 0;
  transition: border-color var(--transition-fast);
}

.ghost-input:focus {
  outline: none;
  border-bottom-color: var(--color-primary);
}

.ghost-input::placeholder {
  color: transparent;
}

/* Green feedback state for correct answers */
.ghost-input.correct {
  border-bottom-color: var(--color-success);
  color: var(--color-success);
}

/* Red feedback state for incorrect answers */
.ghost-input.incorrect {
  border-bottom-color: var(--color-error);
  color: var(--color-error);
}

.hint-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-outline-variant);
  padding: 4px;
  margin-left: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.hint-btn:hover {
  color: var(--color-primary);
  background-color: var(--color-surface-low);
}

.hint-btn.active {
  color: var(--color-primary);
}

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

.notes-feedback-message {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

/* --------------------------------------------------------------------------
   7. TAB 2: 소식 (News) Details
   -------------------------------------------------------------------------- */
.card-announcement {
  border-left: 4px solid var(--color-primary);
}

.card-badge-wrapper {
  margin-bottom: 12px;
}

.badge {
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  display: inline-block;
}

.badge-primary {
  background-color: var(--color-secondary-container);
  color: var(--color-on-secondary-container);
}

.badge-secondary {
  background-color: var(--color-surface-container);
  color: var(--color-on-surface-variant);
}

.announcement-title {
  font-family: var(--font-headline);
  font-size: 19px;
  font-weight: 700;
  color: var(--color-on-surface);
  margin-bottom: 8px;
}

.announcement-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-on-surface-variant);
  margin-bottom: 16px;
  text-align: justify;
}

.announcement-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--color-outline);
}

.announcement-meta svg {
  opacity: 0.8;
}

/* Prayer requests */
.prayer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.prayer-list li {
  display: flex;
  gap: 14px;
}

.prayer-icon-wrapper {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.prayer-text-block {
  display: flex;
  flex-direction: column;
}

.prayer-subject {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-on-surface);
  margin-bottom: 4px;
}

.prayer-detail {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-on-surface-variant);
}

/* Gallery styling */
.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.gallery-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.gallery-more-btn {
  background: none;
  border: none;
  font-family: var(--font-headline);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-outline);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.gallery-more-btn:hover {
  color: var(--color-primary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.gallery-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gallery-image-container {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  background-color: var(--color-surface-low);
}

.gallery-image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-caption {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-on-surface-variant);
  text-align: center;
}

/* --------------------------------------------------------------------------
   8. TAB 3: 헌금 (Giving) Details
   -------------------------------------------------------------------------- */
.card-giving-banner {
  background: linear-gradient(135deg, var(--color-secondary-container) 0%, #dcf0e5 100%);
  border: none;
}

.centered-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 16px 8px;
}

.giving-heart-icon {
  margin-bottom: 16px;
  animation: heart-beat 3s infinite ease-in-out;
}

.giving-scripture {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-on-secondary-container);
  margin-bottom: 8px;
}

.giving-citation {
  font-size: 13px;
  color: var(--color-on-secondary-container);
  opacity: 0.8;
  font-style: normal;
}

.card-giving-accounts .account-purpose {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--color-outline-variant);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.purpose-title {
  font-family: var(--font-headline);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-on-surface);
}

.account-holder {
  font-size: 12px;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: 2px;
}

.account-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
}

.account-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface-low);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.account-item:hover {
  background-color: var(--color-surface-container);
}

.account-details {
  display: flex;
  flex-direction: column;
}

.bank-name {
  font-family: var(--font-headline);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-on-surface-variant);
}

.account-number {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-on-surface);
}

.giving-info-footer {
  font-size: 12px;
  color: var(--color-outline);
}

/* --------------------------------------------------------------------------
   9. TAB 4: 동행 (Connect) Details & Form Controls
   -------------------------------------------------------------------------- */
.card-welcome {
  border-left: 4px solid var(--color-primary);
}

.welcome-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-on-surface-variant);
  text-align: justify;
}

/* Form styles have been removed */

/* --------------------------------------------------------------------------
   10. Component Elements (Buttons, Toasts)
   -------------------------------------------------------------------------- */
.btn {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-lg);
  padding: 14px 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: 0 4px 12px rgba(63, 99, 85, 0.15);
}

.btn-primary:hover {
  background-color: var(--color-secondary);
  box-shadow: 0 6px 16px rgba(63, 99, 85, 0.22);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--color-surface-low);
  color: var(--color-primary);
  border: 1px solid var(--color-outline-variant);
}

.btn-secondary:hover {
  background-color: var(--color-surface-container);
  color: var(--color-secondary);
  border-color: var(--color-outline);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-outline);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  text-decoration: underline;
  transition: color var(--transition-fast);
}

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

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 84px; /* Slightly above mobile bottom nav */
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-normal) cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity var(--transition-normal);
  font-family: var(--font-headline);
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --------------------------------------------------------------------------
   11. Mobile Bottom Navigation Menu
   -------------------------------------------------------------------------- */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px; /* Aligned with app container */
  height: 68px;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--color-outline-variant);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 500;
  padding-bottom: env(safe-area-inset-bottom, 8px); /* Handle notch on newer iOS devices */
}

.nav-item {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
  height: 100%;
  cursor: pointer;
  color: var(--color-on-surface-variant);
  transition: color var(--transition-fast);
  padding: 8px 0;
}

.nav-icon-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 32px;
  border-radius: var(--radius-full);
  margin-bottom: 2px;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.nav-icon {
  width: 22px;
  height: 22px;
}

.nav-label {
  font-family: var(--font-headline);
  font-size: 10px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

/* Active bottom nav state matching screenshots */
.nav-item.active {
  color: var(--color-primary);
}

.nav-item.active .nav-icon-wrapper {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 8px rgba(63, 99, 85, 0.15);
}

.nav-item.active .nav-label {
  font-weight: 700;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   12. Keyframes & Animations
   -------------------------------------------------------------------------- */
@keyframes logo-pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.03); opacity: 0.95; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes heart-beat {
  0% { transform: scale(1); }
  14% { transform: scale(1.08); }
  28% { transform: scale(1); }
  42% { transform: scale(1.08); }
  70% { transform: scale(1); }
}

@keyframes pop-in {
  0% { transform: scale(0.7); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes slide-down {
  0% { transform: translateY(-8px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

/* --------------------------------------------------------------------------
   13. Responsive Adaptations (Tablet & Desktop Dashboard)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  /* Expand App container limit for large screens */
  .app-container {
    max-width: 1024px;
    box-shadow: none;
    border-left: 1px solid var(--color-outline-variant);
    border-right: 1px solid var(--color-outline-variant);
  }

  /* Desktop Header Adjustment */
  .app-header {
    position: sticky !important;
    left: auto !important;
    transform: none !important;
    max-width: 1024px !important;
    padding: 16px 40px !important;
    background-color: rgba(247, 250, 249, 0.9) !important;
    backdrop-filter: blur(12px) !important;
    border-bottom: 1px solid var(--color-outline-variant) !important;
    box-shadow: none !important;
    height: auto !important;
  }

  .app-header.header-transparent-dark .brand-name {
    color: var(--color-primary) !important;
  }
  
  .app-header.header-transparent-dark .brand-sub {
    color: var(--color-on-surface-variant) !important;
  }

  .header-brand {
    position: static !important;
    transform: none !important;
    gap: 12px !important;
    top: auto !important;
    left: auto !important;
  }

  .church-logo {
    width: 40px !important;
    height: 40px !important;
    border-color: var(--color-outline-variant) !important;
  }

  .brand-name {
    font-size: 18px !important;
    color: var(--color-primary) !important;
  }

  .brand-sub {
    display: block !important;
    font-size: 11px !important;
    color: var(--color-on-surface-variant) !important;
    opacity: 1 !important;
    margin-top: -2px !important;
  }

  .tab-content {
    padding-top: 0 !important;
  }

  .header-content {
    height: 60px;
    position: relative !important;
  }

  /* Enable desktop horizontal navigation tabs */
  .desktop-nav {
    display: flex;
    gap: 16px;
    background-color: var(--color-surface-low);
    padding: 6px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-outline-variant);
    position: absolute !important;
    left: 50% !important;
    top: 50% !important;
    transform: translate(-50%, -50%) !important;
  }

  .desktop-nav .nav-tab {
    background: none;
    border: none;
    font-family: var(--font-headline);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 24px;
    border-radius: var(--radius-full);
    color: var(--color-on-surface-variant);
    cursor: pointer;
    transition: all var(--transition-normal);
  }

  .desktop-nav .nav-tab.active {
    background-color: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: 0 4px 8px rgba(63, 99, 85, 0.15);
    font-weight: 700;
  }

  /* Main padding adjustment */
  .app-main {
    padding: 40px 40px 60px 40px;
  }

  /* Transform vertical stacks into multi-column layout dashboards */
  .grid-layout {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 32px;
    align-items: start;
  }

  .two-col-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
    align-items: start;
  }
  
  .two-col-layout > .card {
    min-width: 0;
  }

  /* Tab-specific multi-column setups */
  #tab-worship .grid-layout .card-scripture {
    grid-column: span 6;
  }
  
  #tab-worship .grid-layout .card-sermon-summary {
    grid-column: span 6;
  }

  #tab-connect .grid-layout .card-announcement:nth-child(1) {
    grid-column: span 6;
  }

  #tab-connect .grid-layout .card-announcement:nth-child(2) {
    grid-column: span 6;
  }

  #tab-connect .grid-layout .card-blog-link {
    grid-column: span 6;
  }

  #tab-connect .grid-layout .card-instagram-link {
    grid-column: span 6;
  }

  #tab-giving .grid-layout .card-giving-banner {
    grid-column: span 5;
    height: 100%;
    display: flex;
    justify-content: center;
  }

  #tab-giving .grid-layout .card-giving-accounts {
    grid-column: span 7;
  }

  #tab-connect .grid-layout .card-welcome {
    grid-column: span 7;
  }

  #tab-connect .grid-layout .card-kakao {
    grid-column: span 5;
  }

  #tab-connect .grid-layout .card-map {
    grid-column: span 12;
  }

  .hero-banner {
    margin-top: 0 !important;
    margin-left: 0 !important;
    margin-right: 0 !important;
    border-radius: var(--radius-xl) !important;
    padding: 40px 32px !important;
  }

  /* Hide Mobile Bottom Nav */
  .mobile-nav {
    display: none;
  }

  /* Reposition Toast notifications on desktop */
  .toast {
    bottom: 40px;
  }
}

/* Link Card Hover Effects */
.card-blog-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(63, 99, 85, 0.25);
}

.card-instagram-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(214, 51, 132, 0.3);
}

.card-blog-link,
.card-instagram-link {
  border-radius: var(--radius-lg, 16px);
}

/* ========== About Tab Styles ========== */

.about-hero {
  text-align: center;
  padding: 48px 24px 32px;
}

.about-church-name {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.about-church-tagline {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-on-surface-variant);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: 0.7;
}

.about-intro-wrapper {
  padding: 0 20px 48px;
  max-width: 680px;
  margin: 0 auto;
}

.about-intro-card {
  background: var(--color-surface-lowest);
  border-radius: 28px;
  padding: 44px 32px;
  box-shadow: 0 16px 40px rgba(63, 99, 85, 0.05), 0 2px 8px rgba(63, 99, 85, 0.02);
  border: 1px solid rgba(63, 99, 85, 0.08);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.about-intro-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  bottom: -50%;
  background: radial-gradient(circle, rgba(63, 99, 85, 0.015) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
}

.about-intro-header {
  margin-bottom: 36px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.about-intro-subtitle {
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.6;
  letter-spacing: 2px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}

.about-intro-title {
  font-family: var(--font-headline);
  font-size: 26px;
  font-weight: 800;
  color: var(--color-primary);
  position: relative;
  display: inline-block;
}

.about-intro-title::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 1px;
  opacity: 0.3;
}

.about-intro-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: relative;
  max-width: 520px;
  margin: 0 auto;
  padding: 8px 0 8px 12px;
  z-index: 2;
}

.about-intro-list::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 14px;
  bottom: 44px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    #3f6355 0%,
    #5b6abf 25%,
    #c17e2e 50%,
    #b34040 75%,
    #2e7d6e 100%
  );
  opacity: 0.2;
  border-radius: 2px;
}

@media (min-width: 576px) {
  .about-intro-list::before {
    top: 16px;
    bottom: 16px;
  }
}

.about-intro-item {
  position: relative;
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.3s ease;
  cursor: default;
}

@media (min-width: 576px) {
  .about-intro-item {
    flex-direction: row;
    align-items: center;
    gap: 20px;
  }
}

.about-intro-dot {
  position: absolute;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-color);
  box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.4);
  top: 13px;
  transform: translateY(-50%);
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease;
  z-index: 2;
}

@media (min-width: 576px) {
  .about-intro-dot {
    top: 50%;
  }
}

.about-intro-badge {
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-color);
  background: rgba(var(--accent-rgb), 0.05);
  border: 1px solid rgba(var(--accent-rgb), 0.12);
  padding: 4px 12px;
  border-radius: 30px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: inline-block;
  min-width: 135px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(var(--accent-rgb), 0.02);
  transition: all 0.25s ease;
  flex-shrink: 0;
}

.about-intro-desc {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-on-surface);
  line-height: 1.6;
  text-align: left;
  opacity: 0.9;
  transition: color 0.25s ease;
}

@media (min-width: 768px) {
  .about-intro-desc {
    font-size: 16px;
  }
}

@media (hover: hover) {
  .about-intro-list:hover .about-intro-item {
    opacity: 0.4;
  }

  .about-intro-list:hover .about-intro-item:hover {
    opacity: 1;
    transform: translateX(6px);
  }

  .about-intro-item:hover .about-intro-dot {
    transform: translateY(-50%) scale(1.5);
    box-shadow: 0 0 12px var(--accent-color);
  }

  .about-intro-item:hover .about-intro-badge {
    background: rgba(var(--accent-rgb), 0.1);
    border-color: rgba(var(--accent-rgb), 0.25);
    box-shadow: 0 4px 10px rgba(var(--accent-rgb), 0.06);
  }

  .about-intro-item:hover .about-intro-desc {
    color: var(--color-primary);
  }
}

.about-values-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 0 16px 40px;
  max-width: 720px;
  margin: 0 auto;
}

.about-value-card {
  background: var(--color-surface-container);
  border-radius: 20px;
  padding: 32px 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  border-left: 4px solid var(--accent);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-value-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.08);
}

.value-number {
  font-size: 32px;
  font-weight: 900;
  color: var(--accent);
  opacity: 0.2;
  line-height: 1;
  min-width: 40px;
  flex-shrink: 0;
}

.value-content {
  flex: 1;
}

.value-eng {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 2px;
  letter-spacing: -0.3px;
}

.value-kor {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-on-surface-variant);
  margin-bottom: 12px;
  opacity: 0.8;
}

.value-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-on-surface-variant);
  margin-bottom: 16px;
}

.value-verses {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.value-verses blockquote {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--color-outline);
  padding: 10px 14px;
  background: var(--accent-light);
  border-radius: 10px;
  margin: 0;
  font-style: italic;
}

.value-verses cite {
  display: block;
  font-size: 12px;
  font-style: normal;
  font-weight: 700;
  color: var(--accent);
  margin-top: 4px;
  opacity: 0.7;
}

/* Mobile About Adjustments */
@media (max-width: 767px) {
  .about-hero {
    padding: 32px 20px 24px;
  }

  .about-church-name {
    font-size: 28px;
  }

  .about-church-tagline {
    font-size: 12px;
  }

  .about-value-card {
    padding: 24px 20px;
    flex-direction: column;
    gap: 4px;
  }

  .value-number {
    font-size: 24px;
  }

  .value-eng {
    font-size: 18px;
  }
}