/* ==========================================================================
   LITTLE BIRTHDAY NOTE — between the lines
   Deploy Target: littlebirthdaynote.pages.dev
   STRICT REQUIREMENT: SOLID COLORS ONLY. ZERO GRADIENTS ANYWHERE.
   ZERO DECORATIVE SYMBOLS, ZERO EMOJI, ZERO ICONS.
   ========================================================================== */

/* --------------------------------------------------------------------------
   DESIGN TOKENS & PALETTE (STRICTLY SOLID COLORS)
   -------------------------------------------------------------------------- */
:root {
  /* Prompt Required Solid Palette */
  --c-main-lavender: #C9B8E4;
  --c-deep-lavender: #66577A;
  --c-light-lavender: #EEE7F5;
  --c-warm-paper: #FAF7F2;
  --c-muted-grey: #817A86;
  --c-dark-text: #3D3742;
  --c-muted-rose: #C89CA5;
  --c-warm-beige: #DDD0C1;

  /* Additional Solid Functional Tokens */
  --c-paper-sheet: #FFFFFF;
  --c-border-subtle: #DDD0C1;
  --c-border-lavender: #C9B8E4;
  --c-border-deep: #66577A;
  --c-input-bg: #FFFFFF;
  --c-input-border: #C9B8E4;
  --c-input-focus: #66577A;
  
  --c-feedback-wrong-bg: #FAF0F2;
  --c-feedback-wrong-text: #66577A;
  --c-feedback-wrong-border: #C89CA5;
  
  --c-feedback-correct-bg: #EEE7F5;
  --c-feedback-correct-text: #3D3742;
  --c-feedback-correct-border: #66577A;

  /* Typography */
  --font-editorial: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-accent: 'Caveat', cursive, sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 44px;

  /* Radius (Crisp, Book-paper rectangular) */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
}

/* --------------------------------------------------------------------------
   BASE & RESET
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  background-color: var(--c-light-lavender);
}

body {
  font-family: var(--font-body);
  color: var(--c-dark-text);
  background-color: var(--c-light-lavender);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-md) var(--space-sm);
  width: 100%;
  overflow-x: hidden;
}

/* Visually Hidden Helper for Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* --------------------------------------------------------------------------
   NOTEBOOK SHELL & CONTAINER
   -------------------------------------------------------------------------- */
.notebook-shell {
  width: 100%;
  max-width: 580px;
  margin: 0 auto;
  padding: 0;
}

.notebook-folio {
  width: 100%;
  background-color: var(--c-warm-paper);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-sm);
  padding: 22px 18px;
  position: relative;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

@media (min-width: 520px) {
  .notebook-folio {
    padding: 34px 30px;
  }
}

/* Notebook Delicate Ruled Left Margin Guide (Solid Line) */
.notebook-margin-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 24px;
  width: 1px;
  background-color: var(--c-light-lavender);
  pointer-events: none;
  display: none;
}

@media (min-width: 600px) {
  .notebook-margin-line {
    display: block;
    left: 40px;
  }
}

/* --------------------------------------------------------------------------
   TOP NOTEBOOK HEADER / STATUS BAR (Only shown on inner pages)
   -------------------------------------------------------------------------- */
.notebook-header {
  display: none; /* Shown dynamically via .has-header or on inner screens */
  flex-direction: column;
  gap: var(--space-sm);
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--c-warm-beige);
  width: 100%;
}

.notebook-header.header-visible {
  display: flex;
}

@media (min-width: 480px) {
  .notebook-header.header-visible {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.header-stamp {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
}

.stamp-date {
  font-weight: 600;
  color: var(--c-deep-lavender);
}

.stamp-dot {
  color: var(--c-warm-beige);
}

.stamp-series {
  color: var(--c-muted-grey);
}

.header-status {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-xs);
  max-width: 100%;
  overflow: hidden;
}

.status-block {
  display: flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
  padding: 4px 9px;
  border-right: 1px solid var(--c-warm-beige);
}

.status-block-last {
  border-right: none;
}

.status-label {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.status-val {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c-dark-text);
  letter-spacing: 0.04em;
}

.status-locked {
  color: var(--c-deep-lavender);
  background-color: var(--c-light-lavender);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

.status-ready {
  color: var(--c-warm-paper);
  background-color: var(--c-deep-lavender);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

/* --------------------------------------------------------------------------
   SCREEN SWITCHING & TRANSITIONS
   -------------------------------------------------------------------------- */
.notebook-screen {
  width: 100%;
  display: none;
  opacity: 0;
  transition: opacity 0.24s ease, transform 0.24s ease;
  transform: translateY(3px);
}

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

@media (prefers-reduced-motion: reduce) {
  .notebook-screen {
    transition: none !important;
    transform: none !important;
  }
}

.page-content {
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* --------------------------------------------------------------------------
   EDITORIAL TYPOGRAPHY & ELEMENTS
   -------------------------------------------------------------------------- */
.editorial-caps {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.main-title {
  font-family: var(--font-editorial);
  font-size: clamp(1.8rem, 6.5vw, 2.5rem);
  line-height: 1.15;
  font-weight: 500;
  color: var(--c-dark-text);
  letter-spacing: -0.01em;
  margin-top: var(--space-xs);
  word-break: break-word;
}

.secondary-title {
  font-family: var(--font-accent);
  font-size: 1.35rem;
  color: var(--c-deep-lavender);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.section-title {
  font-family: var(--font-editorial);
  font-size: clamp(1.4rem, 5.5vw, 1.95rem);
  line-height: 1.25;
  font-weight: 500;
  color: var(--c-dark-text);
  word-break: break-word;
}

.editorial-rule {
  width: 100%;
  height: 1px;
  background-color: var(--c-warm-beige);
  margin: var(--space-md) 0;
}

/* --------------------------------------------------------------------------
   BUTTONS (PLAIN TEXT ONLY, NO SYMBOLS, NO GRADIENTS)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px;
  touch-action: manipulation;
  text-decoration: none;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
  user-select: none;
  text-align: center;
}

.btn:focus-visible {
  outline: 2px solid var(--c-deep-lavender);
  outline-offset: 2px;
}

/* Primary Button: Solid Deep Lavender */
.btn-primary {
  background-color: var(--c-deep-lavender);
  color: var(--c-warm-paper);
  border-color: var(--c-deep-lavender);
}

.btn-primary:hover {
  background-color: var(--c-dark-text);
  border-color: var(--c-dark-text);
  color: #FFFFFF;
}

.btn-primary:active {
  background-color: #26212B;
}

/* Large Full Width / Dominant Action */
.btn-large {
  width: 100%;
  padding: 13px 20px;
  font-size: 0.88rem;
  letter-spacing: 0.1em;
}

/* Secondary Button: Clean Solid Outline / Neutral */
.btn-secondary {
  background-color: var(--c-paper-sheet);
  color: var(--c-dark-text);
  border-color: var(--c-warm-beige);
}

.btn-secondary:hover {
  background-color: var(--c-light-lavender);
  border-color: var(--c-main-lavender);
  color: var(--c-deep-lavender);
}

/* Outline Button */
.btn-outline {
  background-color: transparent;
  color: var(--c-muted-grey);
  border-color: var(--c-warm-beige);
}

.btn-outline:hover {
  background-color: var(--c-paper-sheet);
  color: var(--c-deep-lavender);
  border-color: var(--c-main-lavender);
}

/* Check Answer Button inside Form Group */
.btn-check {
  padding: 10px 16px;
  font-size: 0.78rem;
  white-space: nowrap;
}

/* Button Navigation Row */
.button-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
  width: 100%;
}

.button-row-center {
  justify-content: center;
  width: 100%;
}

/* --------------------------------------------------------------------------
   SCREEN 1: COVER PAGE
   -------------------------------------------------------------------------- */
.cover-layout {
  padding: var(--space-xs) 0;
}

.cover-eyebrow {
  margin-bottom: var(--space-xs);
}

.cover-titles {
  margin-bottom: var(--space-xs);
}

.cover-prose {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-dark-text);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.cover-prose p {
  margin-bottom: 4px;
}

.cover-meta-card {
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-md);
  margin-bottom: var(--space-lg);
  width: 100%;
}

.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.meta-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.meta-value {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-dark-text);
  letter-spacing: 0.05em;
}

.meta-separator {
  height: 1px;
  background-color: var(--c-warm-beige);
  margin: var(--space-sm) 0;
  width: 100%;
}

.action-zone {
  width: 100%;
  margin-bottom: var(--space-md);
}

.cover-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-lg);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--c-warm-beige);
  width: 100%;
}

.recipient-tag {
  font-family: var(--font-accent);
  font-size: 1.25rem;
  color: var(--c-deep-lavender);
}

.handle-tag {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-muted-grey);
}

/* --------------------------------------------------------------------------
   SCREEN 2: INTRO PAGE
   -------------------------------------------------------------------------- */
.intro-prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-dark-text);
  margin-bottom: var(--space-lg);
}

.intro-prose p {
  margin-bottom: 6px;
}

.highlight-text {
  color: var(--c-deep-lavender);
  font-weight: 600;
  margin-top: var(--space-xs);
}

.info-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  margin-bottom: var(--space-md);
  width: 100%;
}

.info-col {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-label {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.info-value {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-dark-text);
}

.page-footer-note {
  margin-top: var(--space-lg);
  text-align: center;
}

.subtle-note {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--c-muted-grey);
}

/* --------------------------------------------------------------------------
   WORD GUESSING GAME SCREENS
   -------------------------------------------------------------------------- */
.page-meta-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
  width: 100%;
}

.page-label-tag {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--c-deep-lavender);
}

.page-count-tag {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
}

.highlight-subtag {
  color: var(--c-deep-lavender);
  background-color: var(--c-light-lavender);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-weight: 600;
  font-size: 0.65rem;
}

.clue-card {
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-left: 3px solid var(--c-main-lavender);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  width: 100%;
}

.card-eyebrow {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
  margin-bottom: 4px;
}

.clue-text {
  font-family: var(--font-editorial);
  font-size: clamp(1.15rem, 4.5vw, 1.35rem);
  line-height: 1.4;
  color: var(--c-dark-text);
  font-style: italic;
}

/* Word Puzzle Tiles Display */
.word-puzzle-block {
  margin-bottom: var(--space-md);
  padding: var(--space-xs) 0;
  text-align: center;
  width: 100%;
}

.puzzle-label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  margin-bottom: var(--space-sm);
}

.letters-track {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 5px;
  margin: 0 auto;
  max-width: 100%;
}

.letter-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 29px;
  height: 40px;
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-bottom: 2px solid var(--c-deep-lavender);
  border-radius: var(--radius-xs);
  font-family: var(--font-editorial);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--c-dark-text);
  user-select: none;
}

@media (min-width: 440px) {
  .letter-tile {
    width: 36px;
    height: 46px;
    font-size: 1.55rem;
  }
  .letters-track {
    gap: 7px;
  }
}

.tile-blank {
  background-color: var(--c-light-lavender);
  border: 1px dashed var(--c-main-lavender);
  border-bottom: 2px dashed var(--c-deep-lavender);
  color: var(--c-muted-grey);
  font-weight: 400;
}

.tile-solved {
  background-color: var(--c-light-lavender);
  border-color: var(--c-deep-lavender);
  color: var(--c-deep-lavender);
}

/* Form & Input */
.word-form {
  margin-bottom: var(--space-sm);
  width: 100%;
}

.input-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
  margin-bottom: 4px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100%;
}

@media (min-width: 440px) {
  .input-group {
    flex-direction: row;
    align-items: center;
  }
}

.notebook-input {
  flex: 1;
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--c-dark-text);
  background-color: var(--c-input-bg);
  border: 1px solid var(--c-input-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: 44px;
  transition: border-color 0.15s ease, outline-color 0.15s ease;
}

.notebook-input::placeholder {
  color: var(--c-muted-grey);
  font-style: italic;
  font-size: 0.85rem;
}

.notebook-input:focus {
  outline: 2px solid var(--c-input-focus);
  outline-offset: 1px;
  border-color: var(--c-input-focus);
}

/* Feedback & Hint Boxes */
.feedback-container {
  min-height: 32px;
  margin-bottom: var(--space-xs);
  width: 100%;
}

.feedback-msg {
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.84rem;
  line-height: 1.4;
  margin-top: 2px;
}

.feedback-wrong {
  background-color: var(--c-feedback-wrong-bg);
  border: 1px solid var(--c-feedback-wrong-border);
  color: var(--c-feedback-wrong-text);
}

.feedback-correct {
  background-color: var(--c-feedback-correct-bg);
  border: 1px solid var(--c-feedback-correct-border);
  color: var(--c-feedback-correct-text);
  font-weight: 600;
}

.hint-container {
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-xs);
  padding: 7px 10px;
  margin-top: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.82rem;
  color: var(--c-deep-lavender);
  width: 100%;
}

.hint-tag {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  background-color: var(--c-light-lavender);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  color: var(--c-deep-lavender);
  white-space: nowrap;
}

.hint-message {
  font-style: italic;
}

.hidden-item {
  display: none !important;
}

/* --------------------------------------------------------------------------
   SCREEN 7: GAME COMPLETE
   -------------------------------------------------------------------------- */
.complete-layout {
  padding: var(--space-xs) 0;
}

.complete-prose {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-dark-text);
  margin-bottom: var(--space-lg);
}

.status-ready-panel {
  border-color: var(--c-main-lavender);
  background-color: var(--c-light-lavender);
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: var(--space-lg);
}

.action-zone-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-sm);
  width: 100%;
}

/* --------------------------------------------------------------------------
   SCREEN 8: BIRTHDAY LETTER (CALMEST SCREEN)
   -------------------------------------------------------------------------- */
.letter-layout {
  padding: var(--space-xs) 0;
}

.letter-header {
  margin-bottom: var(--space-xs);
}

.letter-date {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.letter-main-title {
  font-family: var(--font-editorial);
  font-size: clamp(1.8rem, 6vw, 2.3rem);
  font-weight: 500;
  line-height: 1.2;
  color: var(--c-dark-text);
  margin-top: 2px;
}

.letter-recipient {
  font-family: var(--font-accent);
  font-size: 1.35rem;
  color: var(--c-deep-lavender);
  margin-top: 2px;
}

.letter-body {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-dark-text);
  width: 100%;
}

@media (min-width: 480px) {
  .letter-body {
    font-size: 1rem;
    line-height: 1.85;
  }
}

.letter-body p {
  margin-bottom: var(--space-md);
}

.letter-body p:last-child {
  margin-bottom: var(--space-xs);
}

.letter-signoff {
  font-family: var(--font-editorial);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--c-deep-lavender);
  margin-top: var(--space-md);
}

/* --------------------------------------------------------------------------
   SCREEN 9: FINAL SCREEN / CLOSING PAGE
   -------------------------------------------------------------------------- */
.final-layout {
  padding: var(--space-sm) 0;
  text-align: center;
}

.final-layout .editorial-caps {
  display: block;
  margin-bottom: var(--space-xs);
}

.final-layout .section-title {
  font-size: clamp(1.7rem, 6vw, 2.3rem);
  margin-bottom: var(--space-xs);
}

.final-prose {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-dark-text);
  margin-bottom: var(--space-lg);
}

.final-prose p {
  margin-bottom: 4px;
}

.final-signature-card {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--c-paper-sheet);
  border: 1px solid var(--c-warm-beige);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-xl);
  margin: 0 auto var(--space-lg);
}

.signature-date {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted-grey);
  font-weight: 600;
}

.signature-target {
  font-family: var(--font-accent);
  font-size: 1.35rem;
  color: var(--c-deep-lavender);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   RESPONSIVENESS (320px to 1440px+)
   -------------------------------------------------------------------------- */
@media (max-width: 360px) {
  body {
    padding: var(--space-sm) 6px;
  }

  .notebook-folio {
    padding: 16px 12px;
  }

  .letter-tile {
    width: 25px;
    height: 36px;
    font-size: 1.15rem;
  }

  .letters-track {
    gap: 3px;
  }

  .btn {
    padding: 9px 12px;
    font-size: 0.75rem;
  }

  .info-panel {
    grid-template-columns: 1fr;
    gap: 4px;
    text-align: left;
    padding: 8px 10px;
  }

  .info-col {
    flex-direction: row;
    justify-content: space-between;
  }
}