/* ─── Design Tokens ─────────────────────────────────────── */
:root {
  --bg-outer:   #0d0d0c;
  --bg-panel:   #eeeae1;
  --card-bg:    #fffcf5;
  --photo-frame:#f7f1e7;
  --primary:    #667263;
  --primary-hover: #515d50;
  --accent:     #b38b68;
  --text-main:  #403b36;
  --text-muted: #80786f;
  --border:     #d8cfc1;
  --shadow:     rgba(65, 57, 48, 0.16);
  --ink:        var(--text-main);
  --paper:      var(--card-bg);
  --muted:      var(--text-muted);
  --line:       var(--border);
  --page-width: 480px;
}

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

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: var(--bg-outer);
  color: var(--ink);
  font-family: "Noto Serif TC", "Microsoft JhengHei", serif;
}

button {
  border: 0;
  font: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

/* ─── App Shell ──────────────────────────────────────────── */
/* 固定大小的容器，所有 screen 都用 absolute 填滿它 */
.app-shell {
  position: fixed;
  inset: 0;
  width: min(100%, var(--page-width));
  margin: 0 auto;
  overflow: hidden;
  background: var(--bg-panel);
}

/* ─── Screen Base ────────────────────────────────────────── */
/* 每個 screen 獨立佔滿整個 app-shell */
.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  overflow: hidden; /* 預設不捲動，各 screen 自行覆蓋 */
}

.screen.is-active {
  display: flex;
}

/* ─── Buttons ────────────────────────────────────────────── */
.primary-button,
.secondary-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  border-radius: 4px;
  padding: 0 20px;
  font-weight: 700;
}

.primary-button {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: var(--primary);
  color: #fffdf8;
  letter-spacing: 0.1em;
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-button:not(:disabled):active {
  transform: translateY(1px);
  background: var(--primary-hover);
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

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

/* ─── HOME ──────────────────────────────────────────────── */
.screen-home {
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding:
    calc(8px + env(safe-area-inset-top))
    10px
    calc(14px + env(safe-area-inset-bottom));
  background: radial-gradient(circle at top, #f6f2e9 0%, var(--bg-panel) 48%, #e3ded3 100%);
}

/* Polaroid shell */
.polaroid-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  flex: 1;
  min-height: 0;
  padding: 10px 10px 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  box-shadow:
    0 14px 32px var(--shadow),
    0 2px 6px rgba(65, 57, 48, 0.08);
}

.polaroid-shell::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(80, 70, 58, 0.08);
  border-radius: inherit;
  pointer-events: none;
  content: "";
}

.polaroid-photo {
  flex: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
  border: 1px solid #cfc4b4;
  border-radius: 4px;
  background: var(--photo-frame);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.12),
    inset 0 3px 8px rgba(22,18,14,0.3),
    inset 3px 0 7px rgba(22,18,14,0.2),
    inset -3px 0 7px rgba(22,18,14,0.18),
    inset 0 -3px 7px rgba(22,18,14,0.16);
}

.polaroid-photo::after {
  position: absolute;
  z-index: 6;
  inset: 0;
  border-radius: inherit;
  box-shadow:
    inset 0 10px 14px -11px rgba(12,10,8,0.72),
    inset 9px 0 13px -11px rgba(12,10,8,0.58),
    inset -9px 0 13px -11px rgba(12,10,8,0.5),
    inset 0 -8px 12px -11px rgba(12,10,8,0.45);
  content: "";
  pointer-events: none;
}

.style-carousel {
  position: absolute;
  inset: 0;
  display: flex;
  width: 100%;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  touch-action: pan-x;
  cursor: grab;
}

.style-carousel.is-dragging {
  cursor: grabbing;
  scroll-snap-type: none;
  user-select: none;
}

.style-carousel::-webkit-scrollbar { display: none; }

.style-card {
  position: relative;
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #aaa;
  scroll-snap-align: center;
  scroll-snap-stop: always;
  outline: none;
  transform-origin: center;
  transition: opacity 180ms ease, filter 180ms ease;
  will-change: opacity, filter;
}

.style-card:focus-visible { box-shadow: inset 0 0 0 3px #fff; }

.style-card.is-jelly {
  animation: jellySnap 460ms cubic-bezier(0.22, 1.35, 0.38, 1) both;
}

@keyframes jellySnap {
  0%   { transform: scale(1); }
  24%  { transform: scale(1.012, 0.994); }
  48%  { transform: scale(0.995, 1.006); }
  72%  { transform: scale(1.004, 0.998); }
  100% { transform: scale(1); }
}

.style-card.edge-bump {
  animation: edgeBump 420ms cubic-bezier(0.22, 1.2, 0.36, 1) both;
}

@keyframes edgeBump {
  0%, 100% { transform: translateX(0); }
  28%  { transform: translateX(-9px); }
  55%  { transform: translateX(5px); }
  78%  { transform: translateX(-2px); }
}

.swipe-hint {
  position: absolute;
  z-index: 4;
  bottom: 16px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 999px;
  background: rgba(63,59,53,0.72);
  color: #fdfbf6;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  white-space: nowrap;
  pointer-events: none;
  transform: translateX(-50%);
  transition: opacity 0.35s ease, transform 0.35s ease;
  animation: hintPulse 1.7s ease-in-out infinite;
  backdrop-filter: blur(6px);
}

.swipe-hint span { font-size: 19px; line-height: 1; }

.swipe-hint.is-hidden {
  opacity: 0;
  transform: translate(-50%, 8px);
  animation: none;
}

@keyframes hintPulse {
  0%, 100% { transform: translateX(-50%); }
  50%  { transform: translateX(calc(-50% + 5px)); }
}

.style-photo {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
  transform: translate3d(0,0,0) scale(1.01);
  transition: transform 220ms cubic-bezier(0.22, 0.8, 0.32, 1), filter 180ms ease;
  user-select: none;
  will-change: transform, filter;
  -webkit-user-drag: none;
}

.polaroid-caption {
  display: grid;
  flex: 0 0 clamp(82px, 12vh, 112px);
  place-items: center;
  padding: 12px 28px 16px;
  background: var(--card-bg);
}

.polaroid-caption img {
  display: block;
  width: min(82%, 300px);
  height: 58px;
  object-fit: contain;
  mix-blend-mode: multiply;
  transform: rotate(-1deg);
}

.home-controls {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  padding: 6px 5px 2px;
  text-align: center;
}

.photo-start-form {
  display: grid;
  gap: 9px;
}

.participant-field {
  display: grid;
  gap: 5px;
  text-align: left;
}

.participant-field > span {
  padding-left: 2px;
  color: var(--text-main);
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.participant-field b {
  margin-left: 4px;
  color: #8c4338;
  font-size: 10px;
}

.participant-field input {
  width: 100%;
  min-height: 48px;
  border: 1px solid #c9beaf;
  border-radius: 7px;
  outline: none;
  background: rgba(255, 252, 245, 0.92);
  color: var(--text-main);
  padding: 0 14px;
  font: 500 16px/1.2 "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  box-shadow: inset 0 1px 2px rgba(65, 57, 48, 0.06);
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.participant-field input::placeholder {
  color: #9b9288;
}

.participant-field input:focus {
  border-color: var(--primary);
  background: #fffdf8;
  box-shadow: 0 0 0 3px rgba(102, 114, 99, 0.16);
}

.participant-field input:user-invalid {
  border-color: #a95144;
}

.home-controls .primary-button {
  border-radius: 7px;
  box-shadow: 0 5px 14px rgba(65, 78, 64, 0.2);
}

/* ─── CAMERA ─────────────────────────────────────────────── */
.camera-screen {
  padding:
    calc(14px + env(safe-area-inset-top))
    16px
    calc(10px + env(safe-area-inset-bottom));
  background: #111;
  color: #fff;
}

.camera-topbar,
.simple-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  min-height: 36px;
  font-size: 13px;
  letter-spacing: 0.12em;
}

.camera-step {
  color: #88847c;
  font-size: 9px;
}

.back-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: 25px;
  line-height: 1;
}

.camera-stage {
  position: relative;
  flex: 1;
  min-height: 0;
  margin: 10px -16px 0;
  overflow: hidden;
  background: #26231f;
}

.camera-stage video {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.camera-placeholder {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  color: rgba(255,255,255,0.55);
}

.placeholder-icon { margin-bottom: 10px; font-size: 40px; }

.camera-placeholder p  { margin: 0; color: #fff; font-size: 14px; }
.camera-placeholder small { display: block; margin-top: 7px; font-size: 10px; }

.face-guide { display: none; }

.camera-style-pill {
  position: absolute;
  z-index: 2;
  top: 16px;
  left: 50%;
  padding: 7px 13px;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 20px;
  background: rgba(0,0,0,0.35);
  font-size: 11px;
  transform: translateX(-50%);
  white-space: nowrap;
}

.camera-hint { display: none; }

.camera-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  padding: 14px 28px calc(8px + env(safe-area-inset-bottom));
}

.camera-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
}

.camera-switch.invisible { opacity: 0; pointer-events: none; }

.shutter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 76px;
  height: 76px;
  padding: 6px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: transparent;
  flex-shrink: 0;
}

.shutter span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: #fff;
}

.camera-permission {
  flex-shrink: 0;
  min-height: 48px;
  margin-top: 8px;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  width: 100%;
}

/* ─── REVIEW ─────────────────────────────────────────────── */
.review-screen {
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-panel);
  padding:
    calc(12px + env(safe-area-inset-top))
    16px
    calc(16px + env(safe-area-inset-bottom));
}

.review-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding-top: 10px;
  text-align: center;
}

/* Polaroid 外框（確認畫面） */
.photo-frame {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 10px 10px 52px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  box-shadow:
    0 14px 32px var(--shadow),
    0 2px 6px rgba(65, 57, 48, 0.08);
}

.photo-frame::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(80, 70, 58, 0.08);
  border-radius: inherit;
  pointer-events: none;
  content: "";
}

.photo-frame img {
  flex: 1;
  width: 100%;
  min-height: 0;
  object-fit: cover;
  border: 1px solid #cfc4b4;
  border-radius: 4px;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.12),
    inset 0 3px 8px rgba(22,18,14,0.3),
    inset 3px 0 7px rgba(22,18,14,0.2),
    inset -3px 0 7px rgba(22,18,14,0.18),
    inset 0 -3px 7px rgba(22,18,14,0.16);
}

.review-badge,
.result-label {
  position: absolute;
  right: 12px;
  bottom: 16px;
  left: 12px;
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-align: center;
}

.review-content h2 {
  margin: 14px 0 5px;
  font-size: 22px;
}

.review-content p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.review-content p span { color: var(--accent); }

.review-actions {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 9px;
  flex-shrink: 0;
  margin-top: 14px;
}

/* ─── PROCESSING ─────────────────────────────────────────── */
.processing-screen {
  justify-content: center;
  align-items: center;
  text-align: center;
  background: #111;
  color: #fff;
  padding:
    calc(20px + env(safe-area-inset-top))
    24px
    calc(20px + env(safe-area-inset-bottom));
}

.processing-inner {
  width: 100%;
  max-width: 340px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.progress-orbit {
  position: relative;
  display: grid;
  width: 116px;
  height: 116px;
  margin: 0 auto 32px;
  place-items: center;
}

.orbit-ring {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255,255,255,0.3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1.4s linear infinite;
}

.orbit-core { font-size: 28px; }

@keyframes spin { to { transform: rotate(360deg); } }

.processing-steps {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  color: #77736c;
  font-size: 17px;
  line-height: 2.8;
  text-align: left;
}

.processing-steps span {
  display: inline-block;
  width: 28px;
}

.processing-steps .done,
.processing-steps .active { color: #fff; }

.processing-steps b { color: #c6a56c; }

.dont-close {
  margin-top: 20px;
  color: #66625b;
  font-size: 15px;
  line-height: 1.6;
}

/* ─── RESULT ─────────────────────────────────────────────── */
/* position:absolute 脫離 app-shell 的 overflow:hidden，自己控制捲動 */
.result-screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-panel);
  padding:
    calc(12px + env(safe-area-inset-top))
    16px
    calc(20px + env(safe-area-inset-bottom));
}

.result-screen.is-active { display: flex; }

.result-content { text-align: center; }

/* Polaroid 外框（結果畫面） */
.result-image-wrap {
  position: relative;
  height: min(60vh, 540px);
  padding: 10px 10px 52px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  box-shadow:
    0 14px 32px var(--shadow),
    0 2px 6px rgba(65, 57, 48, 0.08);
}

.result-image-wrap::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(80, 70, 58, 0.08);
  border-radius: inherit;
  pointer-events: none;
  content: "";
}

.result-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid #cfc4b4;
  border-radius: 4px;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.12),
    inset 0 3px 8px rgba(22,18,14,0.3),
    inset 3px 0 7px rgba(22,18,14,0.2),
    inset -3px 0 7px rgba(22,18,14,0.18),
    inset 0 -3px 7px rgba(22,18,14,0.16);
}

.cost-card {
  display: flex;
  align-items: center;
  margin-top: 12px;
  padding: 10px 0;
  border: 1px solid rgba(70, 62, 52, 0.18);
  border-radius: 6px;
  background: rgba(255,255,255,0.38);
}

.cost-card > div:not(.cost-divider) { flex: 1; }

.cost-card small,
.cost-card span {
  display: block;
  color: var(--muted);
  font-size: 9px;
}

.cost-card strong {
  display: block;
  margin: 2px 0;
  font-size: 17px;
}

.cost-divider {
  width: 1px;
  height: 30px;
  background: var(--line);
}

.result-actions { padding-top: 14px; }

.share-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 9px;
}

.line-button span {
  color: #36a94e;
  font-size: 10px;
}

.text-button {
  width: 100%;
  margin-top: 13px;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
}

.gallery-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 54px;
  margin-top: 10px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 7px;
  background: var(--accent);
  color: #fffdf8;
  font-weight: 700;
  font-size: inherit;
  letter-spacing: 0.1em;
  text-decoration: none;
  box-shadow: 0 5px 14px rgba(140, 108, 72, 0.25);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.gallery-button:active {
  transform: translateY(1px);
  background: #9a7555;
}

.lottery-link {
  display: inline-block;
  margin-top: 9px;
  color: #8e8a80;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 180ms ease;
}

.lottery-link:hover,
.lottery-link:focus-visible {
  color: #697c67;
}

/* ─── Toast ──────────────────────────────────────────────── */
.toast {
  position: fixed;
  z-index: 30;
  bottom: calc(26px + env(safe-area-inset-bottom));
  left: 50%;
  max-width: calc(100% - 32px);
  padding: 11px 16px;
  border-radius: 4px;
  background: #191816;
  color: #fff;
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 18px);
  transition: 0.25s;
}

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

/* ─── Small screen tweaks (≤ 359px) ─────────────────────── */
@media (max-width: 359px) {
  .screen-home {
    padding:
      calc(4px + env(safe-area-inset-top))
      6px
      calc(6px + env(safe-area-inset-bottom));
  }

  .polaroid-shell { padding: 8px 8px 0; }

  .polaroid-caption {
    flex-basis: 76px;
    padding: 9px 22px 12px;
  }

  .home-controls {
    padding: 4px 3px 1px;
  }

  .participant-field input { min-height: 44px; }

  .photo-start-form { gap: 7px; }
}

/* ─── Desktop framing ────────────────────────────────────── */
@media (min-width: 600px) {
  .app-shell {
    border-right: 1px solid rgba(255,255,255,0.14);
    border-left:  1px solid rgba(255,255,255,0.14);
    box-shadow: 0 0 55px rgba(0,0,0,0.5);
  }
}