/* Puzzle a Day — Shopify-inspired editorial design */

:root {
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Colors */
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-bg-dark: #000000;
  --color-text: #000000;
  --color-text-muted: #52525b;
  --color-text-on-dark: #ffffff;
  --color-text-subtle-dark: #71717a;
  --color-border: #b9b9b9;
  --color-border-dark: #27272a;
  --color-accent: #d0f224;
  --color-success: #22c357;
  --color-error: #b24020;

  /* Radii */
  --radius-card: 1.5rem;
  --radius-sm: 0.375rem;

  /* Shadows */
  --shadow-hover: 0 20px 60px rgba(0, 0, 0, 0.12);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =====================
   HEADER — full dark
   ===================== */
.header {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: var(--space-xl) var(--space-2xl) var(--space-3xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-text-subtle-dark);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.header h1 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--color-text-on-dark);
}

.header-date {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-subtle-dark);
  margin-top: 0;
}

.header-link {
  color: var(--color-text-on-dark);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: var(--space-xs) var(--space-md);
  transition: background 0.15s, border-color 0.15s;
}

.header-link:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.7);
}

/* =====================
   MARQUEE TICKER
   ===================== */
.marquee-bar {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border-dark);
  border-bottom: 1px solid var(--color-border-dark);
  overflow: hidden;
  white-space: nowrap;
  padding: var(--space-sm) 0;
}

.marquee-track {
  display: inline-flex;
  animation: marquee 24s linear infinite;
}

.marquee-track span {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-subtle-dark);
  padding-right: 0;
  white-space: nowrap;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* =====================
   CONTAINER
   ===================== */
.container {
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  flex: 1;
  background: var(--color-bg);
}

/* =====================
   MAIN SECTIONS
   ===================== */
.puzzle-section,
.loading,
.no-puzzle {
  flex: 1;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.puzzle-section {
  justify-content: flex-start;
  padding: var(--space-3xl) var(--space-2xl);
}

.puzzle-section .puzzle-card {
  flex: 1;
  width: 100%;
  max-width: none;
}

.loading,
.no-puzzle {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* =====================
   PUZZLE CARD
   ===================== */
.puzzle-card {
  background: var(--color-surface);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.puzzle-card:hover {
  border-color: var(--color-text);
  box-shadow: var(--shadow-hover);
}

.puzzle-card > * {
  width: 100%;
  max-width: none;
  margin-left: auto;
  margin-right: auto;
}

.puzzle-card h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.difficulty {
  margin-bottom: var(--space-lg);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.difficulty .piece {
  font-size: 1rem;
}

.puzzle-text {
  margin: 0 0 var(--space-xl);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.puzzle-image {
  margin-bottom: var(--space-lg);
}

.puzzle-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-card);
}

/* =====================
   ANSWER AREA
   ===================== */
.answer-area {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.answer-area label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.answer-boxes {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.answer-box {
  width: 52px;
  height: 52px;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  font-family: var(--font-mono);
  transition: border-color 0.15s, background 0.15s;
  color: var(--color-text);
}

.answer-box:focus {
  outline: none;
  border-color: var(--color-text);
}

.answer-box.filled {
  border-color: var(--color-text);
}

.answer-box.correct {
  border-color: var(--color-success);
  background: #f0fdf4;
  color: var(--color-success);
}

.answer-box.incorrect {
  border-color: var(--color-error);
  background: #fff1ee;
  color: var(--color-error);
}

/* =====================
   BUTTONS
   ===================== */
.actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.btn {
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.1s;
  letter-spacing: 0.01em;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-bg-dark);
  color: #ffffff;
  border: 1px solid var(--color-bg-dark);
}

.btn-primary:hover:not(:disabled) {
  background: #27272a;
  border-color: #27272a;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-text);
  color: #ffffff;
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* =====================
   HINTS
   ===================== */
.hints-area {
  margin-bottom: var(--space-lg);
  text-align: left;
  width: 100%;
}

.hint {
  padding: var(--space-md) var(--space-lg);
  background: #f4f4f5;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  text-align: left;
}

/* =====================
   RESULT
   ===================== */
.result {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  text-align: center;
  letter-spacing: 0.02em;
}

.result.correct {
  background: #f0fdf4;
  color: var(--color-success);
  border: 1px solid #bbf7d0;
}

.result.incorrect {
  background: #fff1ee;
  color: var(--color-error);
  border: 1px solid #ffd5cc;
}

/* =====================
   ARCHIVE PAGE
   ===================== */
.archive-section {
  flex: 1;
  background: var(--color-bg);
  padding: var(--space-3xl) var(--space-2xl);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.archive-section p {
  margin: 0 0 var(--space-lg);
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

.date-picker {
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  font-family: var(--font-mono);
  border: 1px solid var(--color-border);
  border-radius: 0;
  margin-bottom: var(--space-xl);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s;
}

.date-picker:focus {
  outline: none;
  border-color: var(--color-text);
}

.archive-result {
  min-height: 2rem;
  width: 100%;
  max-width: 640px;
}

.archive-result .puzzle-card {
  text-align: left;
  align-items: flex-start;
}

/* =====================
   FOOTER
   ===================== */
.page-footer {
  background: var(--color-bg-dark);
  padding: var(--space-2xl);
  border-top: none;
  min-height: 4rem;
}

.page-footer a {
  color: var(--color-text-on-dark);
  text-decoration: none;
}

.page-footer a:hover {
  text-decoration: underline;
}

/* =====================
   UTILITIES
   ===================== */
.hidden {
  display: none !important;
}

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 480px) {
  .header {
    padding: var(--space-lg) var(--space-lg) var(--space-2xl);
  }

  .puzzle-section,
  .archive-section {
    padding: var(--space-xl) var(--space-lg);
  }

  .answer-box {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}