/* ========================================
   Base & Reset
   ======================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --rx-paper: #f5ecd7;
  --rx-paper-dark: #e8dfc8;
  --rx-paper-light: #faf4e6;
  --rx-green: #e2ecda;
  --rx-red: #cc0000;
  --rx-red-dark: #990000;
  --rx-ink: #1a1410;
  --rx-ink-light: #3d3428;
  --rx-gray: #8a7e6e;
  --rx-line: rgba(26, 20, 16, 0.12);
  --rx-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
  --font-hand: "Ma Shan Zheng", "STKaiti", "KaiTi", cursive;
  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", serif;
  --font-mono: "Courier New", "SF Mono", monospace;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--rx-ink);
  color: var(--rx-ink);
  font-family: var(--font-serif);
  -webkit-font-smoothing: antialiased;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: multiply;
}

/* ========================================
   Screen System
   ======================================== */

.screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0s 0.5s;
  z-index: 1;
}

.screen.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.5s ease, visibility 0s 0s;
  z-index: 10;
}

.screen-inner {
  width: 100%;
  max-width: 420px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ========================================
   Screen 0: 诊所门面 Splash
   ======================================== */

#screen-splash {
  background:
    radial-gradient(circle at center, rgba(204, 0, 0, 0.15), transparent 50%),
    linear-gradient(180deg, #1a0808, #0d0505);
  cursor: pointer;
}

.splash-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  transform: rotate(-0.8deg);
}

.clinic-sign {
  background:
    linear-gradient(180deg, var(--rx-paper-light), var(--rx-paper-dark));
  border: 3px solid var(--rx-red);
  padding: 32px 28px 28px;
  text-align: center;
  position: relative;
  box-shadow:
    var(--rx-shadow),
    inset 0 0 60px rgba(0, 0, 0, 0.06);
  max-width: 320px;
  width: 100%;
}

.clinic-sign::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(139, 119, 90, 0.03) 0,
      rgba(139, 119, 90, 0.03) 1px,
      transparent 1px,
      transparent 4px
    );
  pointer-events: none;
}

/* fold crease */
.clinic-sign::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 10%,
    rgba(0, 0, 0, 0.06) 30%,
    rgba(0, 0, 0, 0.08) 50%,
    rgba(0, 0, 0, 0.06) 70%,
    transparent 90%
  );
  pointer-events: none;
}

.sign-cross {
  font-size: 36px;
  color: var(--rx-red);
  margin-bottom: 8px;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.1);
}

.sign-title {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 900;
  color: var(--rx-red);
  letter-spacing: 6px;
  margin-bottom: 4px;
  text-shadow: 1px 1px 0 rgba(204, 0, 0, 0.15);
}

.sign-en {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rx-gray);
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.sign-divider {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--rx-red), transparent);
  margin: 0 auto 14px;
  width: 80%;
}

.sign-scope {
  font-family: var(--font-hand);
  font-size: 20px;
  color: var(--rx-ink);
  letter-spacing: 2px;
  line-height: 1.6;
  margin-bottom: 6px;
}

.sign-years {
  font-size: 14px;
  color: var(--rx-gray);
  letter-spacing: 3px;
}

.splash-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.cta-text {
  font-family: var(--font-hand);
  font-size: 28px;
  color: var(--rx-paper);
  letter-spacing: 8px;
  animation: ctaPulse 2.5s ease-in-out infinite;
}

@keyframes ctaPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.03); }
}

.cta-hint {
  font-size: 12px;
  color: rgba(245, 236, 215, 0.35);
  letter-spacing: 4px;
  animation: blink 1.8s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.12; }
}

.splash-footer {
  font-size: 13px;
  color: rgba(245, 236, 215, 0.2);
  letter-spacing: 2px;
  position: fixed;
  bottom: max(20px, env(safe-area-inset-bottom, 20px));
}

/* ========================================
   Screen 1: 挂号
   ======================================== */

#screen-register {
  background:
    radial-gradient(ellipse at top, rgba(204, 0, 0, 0.06), transparent 40%),
    linear-gradient(180deg, var(--rx-paper-light), var(--rx-paper));
  overflow-y: auto;
}

.rx-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 28px;
  align-self: flex-start;
  padding-top: max(48px, env(safe-area-inset-top, 48px));
}

.rx-symbol {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 700;
  color: var(--rx-red);
  font-style: italic;
  line-height: 1;
}

.rx-label {
  font-size: 18px;
  color: var(--rx-gray);
  letter-spacing: 4px;
}

.register-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field-label {
  font-size: 16px;
  color: var(--rx-ink-light);
  letter-spacing: 2px;
  font-weight: 700;
}

.field-optional {
  font-weight: 400;
  font-size: 13px;
  color: var(--rx-gray);
}

.gen-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.gen-btn {
  background: transparent;
  border: 1.5px solid var(--rx-line);
  color: var(--rx-ink-light);
  font-size: 17px;
  font-family: var(--font-hand);
  padding: 10px 16px;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 2px;
  min-width: 60px;
}

.gen-btn:hover,
.gen-btn:active {
  border-color: var(--rx-red);
  background: rgba(204, 0, 0, 0.05);
}

.gen-btn.selected {
  border-color: var(--rx-red);
  background: var(--rx-red);
  color: var(--rx-paper);
  transform: rotate(-1deg);
  box-shadow: 0 4px 12px rgba(204, 0, 0, 0.25);
}

.city-select {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  font-family: var(--font-serif);
  border: 1.5px solid var(--rx-line);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.4);
  color: var(--rx-ink);
  outline: none;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238a7e6e' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.city-select:focus {
  border-color: var(--rx-red);
}

/* ========================================
   Screen 2: 填写症状
   ======================================== */

#screen-symptom {
  background:
    linear-gradient(180deg, var(--rx-paper-light), var(--rx-paper));
}

.symptom-inner {
  height: 100vh;
  padding-top: max(20px, env(safe-area-inset-top, 20px));
  padding-bottom: max(24px, env(safe-area-inset-bottom, 24px));
  justify-content: flex-start;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.symptom-title {
  font-family: var(--font-hand);
  font-size: 24px;
  color: var(--rx-ink);
  letter-spacing: 2px;
  text-align: left;
  align-self: flex-start;
  margin-bottom: 4px;
}

.symptom-hint {
  font-size: 13px;
  color: var(--rx-gray);
  align-self: flex-start;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.symptom-options {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.symptom-btn {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  font-size: 16px;
  font-family: var(--font-hand);
  background: rgba(255, 255, 255, 0.45);
  border: 1.5px solid var(--rx-line);
  border-radius: 2px;
  color: var(--rx-ink-light);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  line-height: 1.4;
}

.symptom-btn::before {
  content: '□';
  margin-right: 10px;
  font-family: var(--font-mono);
  color: var(--rx-gray);
  font-size: 14px;
}

.symptom-btn:hover,
.symptom-btn:active {
  border-color: var(--rx-red);
  background: rgba(204, 0, 0, 0.04);
}

.symptom-btn.selected {
  border-color: var(--rx-red);
  background: rgba(204, 0, 0, 0.08);
  color: var(--rx-ink);
}

.symptom-btn.selected::before {
  content: '☑';
  color: var(--rx-red);
}

.symptom-free {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.symptom-input {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-family: var(--font-hand);
  border: 1.5px solid var(--rx-line);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.45);
  color: var(--rx-ink);
  outline: none;
  resize: none;
  transition: border-color 0.2s ease;
  line-height: 1.5;
}

.symptom-input::placeholder {
  color: var(--rx-gray);
  font-size: 14px;
}

.symptom-input:focus {
  border-color: var(--rx-red);
}

/* ========================================
   Screen 3: 开方等待
   ======================================== */

#screen-loading {
  background:
    radial-gradient(ellipse at center, rgba(204, 0, 0, 0.04), transparent 50%),
    linear-gradient(180deg, var(--rx-paper-light), var(--rx-paper));
}

.loading-inner {
  gap: 28px;
}

.loading-paper {
  width: 280px;
  background: var(--rx-paper-light);
  border: 2px solid var(--rx-line);
  padding: 24px 20px;
  position: relative;
  box-shadow: var(--rx-shadow);
  transform: rotate(-1.5deg);
}

.loading-paper::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 28px,
      rgba(26, 20, 16, 0.06) 28px,
      rgba(26, 20, 16, 0.06) 29px
    );
  pointer-events: none;
}

.loading-header {
  font-size: 16px;
  color: var(--rx-red);
  letter-spacing: 4px;
  text-align: center;
  margin-bottom: 20px;
  font-weight: 700;
}

.loading-lines {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 100px;
}

.writing-line {
  height: 20px;
  background: linear-gradient(90deg, var(--rx-ink-light), transparent);
  border-radius: 1px;
  opacity: 0;
  transform-origin: left center;
  transform: scaleX(0);
}

.writing-line.animating {
  animation: writeLine 1.2s ease-out forwards;
}

@keyframes writeLine {
  0% { opacity: 0.6; transform: scaleX(0); }
  100% { opacity: 0.15; transform: scaleX(1); }
}

.writing-line:nth-child(1) { width: 85%; }
.writing-line:nth-child(2) { width: 70%; }
.writing-line:nth-child(3) { width: 55%; }

.loading-pen {
  position: absolute;
  bottom: 30px;
  right: 30px;
  animation: penMove 2s ease-in-out infinite;
}

@keyframes penMove {
  0%, 100% { transform: translate(0, 0) rotate(-30deg); }
  25% { transform: translate(-20px, -5px) rotate(-35deg); }
  50% { transform: translate(-40px, 0) rotate(-25deg); }
  75% { transform: translate(-15px, 5px) rotate(-30deg); }
}

.pen-icon {
  font-size: 24px;
}

.loading-text {
  font-family: var(--font-hand);
  font-size: 20px;
  color: var(--rx-ink-light);
  letter-spacing: 3px;
}

.dots span {
  animation: dotPulse 1.4s ease-in-out infinite;
}

.dots span:nth-child(1) { animation-delay: 0s; }
.dots span:nth-child(2) { animation-delay: 0.2s; }
.dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotPulse {
  0%, 60%, 100% { opacity: 0.2; }
  30% { opacity: 1; }
}

/* ========================================
   Screen 4: 处方笺 + 分享
   ======================================== */

#screen-result {
  background: linear-gradient(180deg, #1a0e08, #0d0705);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  align-items: flex-start;
}

.result-inner {
  padding-top: max(28px, env(safe-area-inset-top, 28px));
  padding-bottom: max(36px, env(safe-area-inset-bottom, 36px));
  min-height: 100%;
  justify-content: flex-start;
  margin: 0 auto;
}

/* The Prescription Card */
.prescription-card {
  width: 100%;
  max-width: 360px;
  background:
    linear-gradient(180deg, var(--rx-paper-light), var(--rx-paper), var(--rx-paper-dark));
  border: none;
  padding: 0;
  position: relative;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(26, 20, 16, 0.15);
  overflow: hidden;
}

/* paper texture overlay */
.prescription-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 28px,
      rgba(26, 20, 16, 0.04) 28px,
      rgba(26, 20, 16, 0.04) 29px
    ),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 100%
    );
  pointer-events: none;
  z-index: 1;
}

/* horizontal fold crease */
.prescription-card::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 5%,
    rgba(0, 0, 0, 0.04) 20%,
    rgba(0, 0, 0, 0.06) 50%,
    rgba(0, 0, 0, 0.04) 80%,
    transparent 95%
  );
  pointer-events: none;
  z-index: 2;
}

.rx-card-header {
  padding: 24px 24px 16px;
  text-align: center;
  border-bottom: 2px solid var(--rx-red);
  position: relative;
  z-index: 3;
}

.rx-card-cross {
  font-size: 28px;
  color: var(--rx-red);
  margin-bottom: 4px;
}

.rx-card-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 900;
  color: var(--rx-red);
  letter-spacing: 8px;
  margin-bottom: 2px;
}

.rx-card-en {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--rx-gray);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.rx-card-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rx-red), transparent);
  width: 60%;
  margin: 0 auto;
}

.rx-card-body {
  padding: 20px 24px;
  position: relative;
  z-index: 3;
}

.rx-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  align-items: baseline;
}

.rx-label-sm {
  font-size: 13px;
  color: var(--rx-gray);
  letter-spacing: 2px;
  flex-shrink: 0;
  min-width: 42px;
}

.rx-value {
  font-family: var(--font-hand);
  font-size: 18px;
  color: var(--rx-ink);
  line-height: 1.5;
}

.rx-value-song {
  font-size: 22px;
  font-weight: 700;
  color: var(--rx-red-dark);
}

.rx-value-dosage {
  font-family: var(--font-hand);
  font-size: 16px;
  color: var(--rx-ink-light);
  padding-left: 52px;
}

.rx-value-reason {
  font-size: 15px;
  color: var(--rx-ink-light);
}

.rx-value-side {
  font-size: 18px;
  color: var(--rx-ink);
  font-weight: 700;
}

.rx-value-note {
  font-size: 16px;
  color: var(--rx-red-dark);
  font-weight: 700;
}

.rx-value-symptom {
  font-size: 16px;
}

.rx-divider-thin {
  height: 1px;
  background: var(--rx-line);
  margin-bottom: 12px;
}

.rx-row-song {
  margin-top: 4px;
}

.rx-row-dosage {
  margin-top: -6px;
  margin-bottom: 14px;
}

.rx-row-side {
  margin-bottom: 14px;
}

.rx-card-footer {
  padding: 16px 24px 24px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  position: relative;
  z-index: 3;
}

.rx-stamp {
  width: 72px;
  height: 72px;
  border: 3px solid var(--rx-red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-15deg);
  opacity: 0.75;
  position: relative;
}

.rx-stamp::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1px solid var(--rx-red);
  border-radius: 50%;
}

.stamp-text {
  font-size: 12px;
  color: var(--rx-red);
  text-align: center;
  font-weight: 900;
  letter-spacing: 1px;
  line-height: 1.3;
}

.rx-signature {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.sig-name {
  font-family: var(--font-hand);
  font-size: 28px;
  color: var(--rx-ink);
}

.sig-role {
  font-size: 12px;
  color: var(--rx-gray);
  letter-spacing: 3px;
}

/* ========================================
   Share Actions
   ======================================== */

.share-actions {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 360px;
}

.share-btn {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 2px;
  font-size: 16px;
  font-family: var(--font-hand);
  font-weight: 700;
  letter-spacing: 3px;
  cursor: pointer;
  transition: all 0.25s ease;
}

.share-btn:hover,
.share-btn:active {
  transform: scale(1.02) rotate(-0.3deg);
}

.share-btn-primary {
  background: var(--rx-red);
  color: var(--rx-paper);
  box-shadow: 0 6px 20px rgba(204, 0, 0, 0.3);
}

.share-btn-secondary {
  background: rgba(245, 236, 215, 0.08);
  border: 1.5px solid rgba(245, 236, 215, 0.15);
  color: rgba(245, 236, 215, 0.6);
}

.share-btn-secondary:hover,
.share-btn-secondary:active {
  border-color: rgba(245, 236, 215, 0.3);
  color: rgba(245, 236, 215, 0.85);
}

.share-note {
  font-size: 13px;
  color: rgba(245, 236, 215, 0.3);
  text-align: center;
  letter-spacing: 3px;
  padding: 4px 0;
}

.share-note.is-success {
  color: rgba(245, 236, 215, 0.7);
}

.share-note.is-error {
  color: #ff8a8a;
}

/* ========================================
   Next Button (shared)
   ======================================== */

.next-btn {
  padding: 14px 48px;
  border: 2px solid var(--rx-red);
  border-radius: 2px;
  font-size: 18px;
  font-family: var(--font-hand);
  font-weight: 700;
  letter-spacing: 4px;
  cursor: pointer;
  transition: all 0.25s ease;
  color: var(--rx-paper);
  background: var(--rx-red);
  box-shadow: 0 6px 20px rgba(204, 0, 0, 0.2);
  position: sticky;
  bottom: max(16px, env(safe-area-inset-bottom, 16px));
  z-index: 20;
  margin-top: auto;
  align-self: center;
}

.next-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  background: var(--rx-gray);
  border-color: var(--rx-gray);
  box-shadow: none;
}

.next-btn:not(:disabled):hover,
.next-btn:not(:disabled):active {
  transform: scale(1.03) rotate(-0.5deg);
  box-shadow: 0 8px 24px rgba(204, 0, 0, 0.35);
}

/* ========================================
   Prescription card entrance animation
   ======================================== */

.prescription-card {
  opacity: 0;
  transform: translateY(30px) rotate(-1deg);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.prescription-card.revealed {
  opacity: 1;
  transform: translateY(0) rotate(-0.5deg);
}

.rx-stamp {
  opacity: 0;
  transform: rotate(-15deg) scale(0.3);
  transition: opacity 0.4s ease 0.6s, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) 0.6s;
}

.prescription-card.revealed .rx-stamp {
  opacity: 0.75;
  transform: rotate(-15deg) scale(1);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-height: 600px) {
  .sign-title { font-size: 24px; }
  .sign-scope { font-size: 17px; }
  .cta-text { font-size: 24px; }
  .rx-header { padding-top: 28px; }
  .loading-paper { width: 240px; padding: 18px 16px; }
}

@media (max-width: 360px) {
  .screen-inner { padding: 0 16px; }
  .prescription-card { max-width: 100%; }
  .rx-card-title { font-size: 18px; letter-spacing: 4px; }
  .rx-value-song { font-size: 19px; }
}