/* =========================================================
   Happy Birthday — Infinite Grid — Styles
   ========================================================= */

:root {
  --bg: #08080f;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-solid: #131320;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f0f0f5;
  --text-dim: rgba(255, 255, 255, 0.45);
  --accent: #e8a0bf;
  --accent-dim: #b86b8f;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 32px 80px rgba(0, 0, 0, 0.6),
                 0 0 0 1px rgba(255, 255, 255, 0.06);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- Page ---- */
.page-wrapper {
  position: relative;
  width: 100%;
  height: 100vh;
}

/* ---- Header ---- */
.header {
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 20;
  text-align: center;
  padding: 2rem 1rem 1rem;
  pointer-events: none;
}

.title {
  display: inline-block;
  font-family: var(--font);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(8, 8, 15, 0.7);
  padding: 0.6rem 2rem;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-shadow:
    0 0 20px rgba(232, 160, 191, 0.5),
    0 0 60px rgba(232, 160, 191, 0.25),
    0 2px 4px rgba(0, 0, 0, 0.6);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  pointer-events: auto;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              text-shadow 0.3s ease,
              box-shadow 0.3s ease;
}

button.title {
  border: 1px solid rgba(255, 255, 255, 0.06);
  outline: none;
}

.title:hover {
  transform: scale(1.12);
  text-shadow:
    0 0 30px rgba(232, 160, 191, 0.7),
    0 0 80px rgba(232, 160, 191, 0.4),
    0 2px 4px rgba(0, 0, 0, 0.6);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6);
}

.title:active {
  transform: scale(1.06);
}

/* ---- Grid container ---- */
.grid-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  cursor: grab;
  -webkit-user-select: none;
  user-select: none;
  touch-action: none;
  -webkit-overflow-scrolling: auto;
}

.grid-container:active {
  cursor: grabbing;
}

/* ---- Grid tiles ---- */
.grid-tile {
  position: absolute;
  top: 0;
  left: 0;
  overflow: visible;
  will-change: translate;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--surface);
  transition: scale 0.22s ease-out,
              transform 0.22s ease-out;
}

.grid-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  transition: filter 0.3s ease;
}

.grid-tile.is-guessed img {
  filter: brightness(0.5);
}

/* Checkmark badge on guessed tiles */
.grid-tile.is-guessed::after {
  content: '✓';
  position: absolute;
  top: 6px;
  left: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(232, 160, 191, 0.85);
  color: #0a0a0f;
  font-size: 12px;
  font-weight: 700;
  line-height: 20px;
  text-align: center;
  pointer-events: none;
  z-index: 2;
}

/* Vignette + spotlight */
.grid-vignette {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 5;
  background:
    radial-gradient(circle 32vmin at center, rgba(255, 255, 255, 0.04) 0%, transparent 100%),
    radial-gradient(ellipse at center, transparent 45%, rgba(8, 8, 15, 0.55) 100%);
}

/* =========================================================
   Info Popup (Happy Birthday → description)
   ========================================================= */
.info-popup {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.info-popup.is-open {
  opacity: 1;
  visibility: visible;
}

.info-popup-backdrop {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.info-popup-card {
  position: relative;
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 2.5rem 2rem 2rem;
  transform: scale(0.92) translateY(12px);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.info-popup.is-open .info-popup-card {
  transform: scale(1) translateY(0);
}

.info-popup-heading {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--accent);
  text-align: center;
  margin-bottom: 1.2rem;
  text-shadow: 0 0 20px rgba(232, 160, 191, 0.3);
}

.info-popup-text {
  font-size: 0.95rem;
  color: var(--text);
  opacity: 0.88;
  line-height: 1.65;
  text-align: center;
  margin-bottom: 0.9rem;
}

.info-popup-text:last-of-type {
  margin-bottom: 0;
}

/* =========================================================
   Photo Overlay
   ========================================================= */
.overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.overlay-backdrop {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.overlay-card {
  position: relative;
  width: 100%;
  max-width: 460px;
  border-radius: var(--radius);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transform: scale(0.92) translateY(12px);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.overlay.is-open .overlay-card {
  transform: scale(1) translateY(0);
}

/* Close button (shared between overlay + info popup) */
.btn-close {
  position: absolute;
  top: 0.6rem; right: 0.6rem;
  z-index: 10;
  width: 2.25rem; height: 2.25rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.btn-close:hover { background: rgba(255, 255, 255, 0.16); }

/* =========================================================
   Flip Card
   ========================================================= */
.flip-card { perspective: 1000px; }

.flip-inner {
  position: relative;
  width: 100%;
  transition: transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
}

.flip-card.is-flipped .flip-inner {
  transform: rotateY(180deg);
}

.flip-front,
.flip-back {
  width: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.flip-back {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  transform: rotateY(180deg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-solid);
  padding: 2.5rem 2rem;
}

/* ---- Front ---- */
.overlay-photo-wrap {
  width: 100%;
  aspect-ratio: 1;
  background: #000;
  overflow: hidden;
}

.overlay-photo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.overlay-action {
  padding: 1.25rem 1.5rem;
}

.overlay-action--center {
  display: flex;
  justify-content: center;
}

/* Guess form */
.guess-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.guess-row { display: flex; gap: 0.5rem; }

.guess-input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.35);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.guess-input::placeholder { color: var(--text-dim); }

.guess-input:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 2px rgba(232, 160, 191, 0.12);
}

/* Buttons */
.btn-primary {
  padding: 0.6rem 1.3rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #0a0a0f;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--accent-dim);
  color: #fff;
}

.btn-primary:active { transform: scale(0.97); }

.btn-primary--wide {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
}

.btn-ghost {
  padding: 0.55rem 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent-dim);
}

/* ---- Back (reveal) ---- */
.reveal-content {
  text-align: center;
  width: 100%;
}

.reveal-guessed {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
  letter-spacing: 0.03em;
}

.reveal-circle {
  width: 96px; height: 96px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 1rem;
  border: 2px solid var(--accent-dim);
}

.reveal-circle img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.reveal-name {
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.reveal-message {
  font-size: 0.95rem;
  color: var(--text);
  opacity: 0.88;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.reveal-prior-guess {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--text-dim);
  margin-bottom: 1.2rem;
  letter-spacing: 0.02em;
}

.reveal-prior-guess:empty {
  display: none;
}

/* =========================================================
   Login Page
   ========================================================= */
.login-page {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background:
    radial-gradient(circle at 50% 40%, rgba(232, 160, 191, 0.06) 0%, transparent 60%),
    var(--bg);
}

.login-card {
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 2.5rem 2rem 2rem;
  text-align: center;
}

.login-heading {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
  text-shadow:
    0 0 20px rgba(232, 160, 191, 0.5),
    0 0 60px rgba(232, 160, 191, 0.25);
}

.login-subtext {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.login-error {
  font-size: 0.82rem;
  color: #e57373;
  margin-bottom: 1rem;
  padding: 0.5rem 0.8rem;
  background: rgba(229, 115, 115, 0.1);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(229, 115, 115, 0.2);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login-input {
  padding: 0.7rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.35);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  text-align: center;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.login-input::placeholder { color: var(--text-dim); }

.login-input:focus {
  border-color: var(--accent-dim);
  box-shadow: 0 0 0 2px rgba(232, 160, 191, 0.12);
}

/* =========================================================
   Info Popup Actions
   ========================================================= */
.info-popup-actions {
  margin-top: 1.5rem;
  text-align: center;
}

.btn-ghost--danger {
  color: #e57373;
  border-color: rgba(229, 115, 115, 0.25);
  font-size: 0.8rem;
}

.btn-ghost--danger:hover {
  background: rgba(229, 115, 115, 0.1);
  border-color: rgba(229, 115, 115, 0.5);
  color: #ef9a9a;
}