/* ====== RESET & BASE (phuongdo.nl stijl) ====== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:       #111;
  --white:       #FFF;
  --off-white:   #FAFAFA;
  --grey:        #999;
  --grey-light:  #CCC;
  --pink:        #F0C4B8;
  --pink-d:      #D9A090;
  --pink-light:  #F9E4DE;
  --blue:        #B8D8D8;
  --blue-d:      #8FBFBF;
  --sage:        #D7E5E2;
  --border:      rgba(0,0,0,0.08);

  --bg:          var(--white);
  --bg-alt:      var(--off-white);
  --text:        var(--black);
  --text-light:  var(--grey);
  --text-muted:  var(--grey-light);

  --serif:       'Playfair Display', Georgia, serif;
  --sans:        'Jost', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:        'DM Mono', ui-monospace, monospace;

  --protein:     var(--blue-d);
  --fat:         var(--pink-d);
  --carbs:       #7CA883;
  --water:       var(--blue-d);
  --danger:      #C94842;
  --success:     #7CA883;

  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html { font-size: 16px; height: 100%; }

body {
  font-family: var(--sans);
  font-weight: 300;
  background: #FDF6F2;
  color: var(--text);
  height: 100%;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.01em;
  line-height: 1.5;
  background-image:
    linear-gradient(rgba(217, 160, 144, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 160, 144, 0.15) 1px, transparent 1px);
  background-size: 24px 24px;
}

::selection { background: var(--pink); color: var(--black); }

/* ====== APP LAYOUT ====== */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 520px;
  margin: 0 auto;
  background: transparent;
  position: relative;
}

/* ====== HEADER ====== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(253, 246, 242, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--pink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--black);
  flex-shrink: 0;
}

.header-info h1 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.header-info span {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--grey);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.header-btn {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 8px;
  border-radius: 0;
  color: var(--grey);
  transition: color 0.2s;
}

.header-btn:hover { color: var(--black); }

/* ====== PROGRESS STRIP ====== */
.progress-strip {
  display: flex;
  gap: 4px;
  padding: 12px 20px;
  background: rgba(253, 246, 242, 0.85);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.progress-item {
  flex: 1;
  text-align: center;
}

.progress-item .label {
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--grey);
  margin-bottom: 5px;
}

.progress-item .bar {
  height: 3px;
  background: var(--border);
  border-radius: 0;
  overflow: hidden;
}

.progress-item .bar-fill {
  height: 100%;
  transition: width 0.5s ease;
}

.progress-item .value {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  margin-top: 4px;
  color: var(--black);
}

.bar-fill.kcal { background: var(--black); }
.bar-fill.protein { background: var(--blue-d); }
.bar-fill.fat { background: var(--pink-d); }
.bar-fill.carbs { background: var(--carbs); }
.bar-fill.water { background: var(--blue-d); }

/* ====== CHAT ====== */
.chat {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.msg {
  max-width: 85%;
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.6;
  animation: fadeIn 0.25s ease;
  word-wrap: break-word;
  letter-spacing: 0.005em;
}

.msg.bot {
  align-self: flex-start;
  background: var(--white);
  border: 1px solid var(--border);
  color: var(--black);
  border-radius: 0;
}

.msg.user {
  align-self: flex-end;
  background: var(--pink);
  color: var(--black);
  border-radius: 0;
  font-weight: 400;
}

.msg.system {
  align-self: center;
  background: var(--off-white);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
  text-align: center;
  max-width: 90%;
  padding: 8px 14px;
}

.msg .time {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--grey);
  margin-top: 8px;
  display: block;
  letter-spacing: 0.08em;
}

.msg.user .time { color: var(--pink-d); }

.msg strong { font-weight: 600; }
.msg em {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
}

.msg .histamine-warn {
  display: inline-block;
  background: var(--pink-light);
  color: var(--pink-d);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  margin-top: 6px;
  font-weight: 500;
}

.msg .food-summary {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 13px;
}

.msg .food-item {
  display: flex;
  justify-content: space-between;
  padding: 3px 0;
}

.msg .food-item .macros {
  font-family: var(--mono);
  color: var(--grey);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.msg .food-total {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

.msg .macro-badges {
  display: flex;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.macro-badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 9px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  background: var(--white);
}

.macro-badge.kcal { border-color: var(--black); color: var(--black); }
.macro-badge.protein { border-color: var(--blue-d); color: var(--blue-d); }
.macro-badge.fat { border-color: var(--pink-d); color: var(--pink-d); }
.macro-badge.carbs { border-color: var(--carbs); color: var(--carbs); }

/* ====== QUICK REPLIES ====== */
.quick-replies {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 4px 0;
  animation: fadeIn 0.3s ease;
}

.quick-reply {
  background: var(--white);
  border: 1.5px solid var(--black);
  color: var(--black);
  padding: 8px 14px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  border-radius: 0;
}

.quick-reply:hover, .quick-reply:active {
  background: var(--black);
  color: var(--white);
}

/* ====== INPUT AREA ====== */
.input-area {
  padding: 12px 16px;
  padding-bottom: calc(12px + var(--safe-bottom));
  background: rgba(253, 246, 242, 0.92);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.input-actions {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
  flex-wrap: wrap;
  padding-bottom: 2px;
}

.action-btn {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  white-space: nowrap;
  color: var(--black);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 4px;
  border-radius: 0;
}

.action-btn:hover, .action-btn:active {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.input-row textarea {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: 0;
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--sans);
  font-weight: 300;
  resize: none;
  outline: none;
  max-height: 100px;
  min-height: 44px;
  line-height: 1.5;
  background: var(--off-white);
  color: var(--black);
  transition: border-color 0.2s;
}

.input-row textarea:focus { border-color: var(--black); }
.input-row textarea::placeholder { color: var(--grey); font-style: italic; }

.send-btn {
  width: 44px;
  height: 44px;
  border-radius: 0;
  background: var(--black);
  border: none;
  color: var(--white);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.send-btn:hover { background: var(--pink-d); }
.send-btn:active { transform: scale(0.94); }
.send-btn:disabled { background: var(--grey-light); cursor: default; }

/* ====== TYPING INDICATOR ====== */
.typing {
  display: flex;
  gap: 4px;
  padding: 14px 18px;
  align-self: flex-start;
  background: var(--white);
  border: 1px solid var(--border);
}

.typing span {
  width: 6px;
  height: 6px;
  background: var(--grey);
  border-radius: 50%;
  animation: bounce 1.4s infinite;
}

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

/* ====== SUMMARY CARD ====== */
.summary-card {
  background: var(--off-white);
  border: 1px solid var(--border);
  padding: 18px;
  margin-top: 8px;
  border-radius: 0;
}

.summary-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--black);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 13px;
}

.summary-row > span:first-child {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grey);
}

.summary-row .bar-wrap {
  flex: 1;
  height: 4px;
  background: var(--border);
  margin: 0 12px;
  overflow: hidden;
}

.summary-row .bar-inner {
  height: 100%;
  transition: width 0.6s ease;
}

.summary-row .val {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  min-width: 60px;
  text-align: right;
  color: var(--black);
  letter-spacing: 0.04em;
}

/* ====== OVERLAY PANELS (settings, history, tips, product-search) ====== */
.settings-overlay,
.history-overlay {
  position: fixed;
  inset: 0;
  background: rgba(17,17,17,0.5);
  z-index: 100;
  display: none;
  align-items: flex-end;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.settings-overlay.open,
.history-overlay.open { display: flex; }

.settings-panel,
.history-panel {
  background: var(--white);
  width: 100%;
  max-width: 520px;
  max-height: 85vh;
  border-radius: 0;
  padding: 28px 24px;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
  border-top: 2px solid var(--black);
}

.settings-panel h2,
.history-panel h2 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.close-btn {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--grey);
  padding: 4px;
  transition: color 0.2s;
}

.close-btn:hover { color: var(--black); }

.settings-group {
  margin-bottom: 18px;
}

.settings-group label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 8px;
}

.settings-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 0;
  font-size: 14px;
  font-family: var(--sans);
  font-weight: 400;
  outline: none;
  background: var(--off-white);
  color: var(--black);
  transition: border-color 0.2s;
}

.settings-group input:focus { border-color: var(--black); }

.settings-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.settings-save {
  width: 100%;
  padding: 14px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 10px;
  transition: background 0.2s;
}

.settings-save:hover { background: var(--pink-d); }

.settings-danger {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.settings-danger button {
  width: 100%;
  padding: 12px;
  background: none;
  border: 1.5px solid var(--danger);
  color: var(--danger);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.2s;
}

.settings-danger button:hover {
  background: var(--danger);
  color: var(--white);
}

/* ====== HISTORY ====== */
.history-day {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.history-day .date {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.history-day .stats {
  display: flex;
  gap: 16px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--grey);
  letter-spacing: 0.04em;
  flex-wrap: wrap;
}

.history-day .stats span {
  font-weight: 500;
  color: var(--black);
}

.weight-trend {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  padding: 20px;
  background: var(--pink-light);
  margin-bottom: 20px;
}

.weight-trend .current {
  font-family: var(--serif);
  font-size: 42px;
  font-weight: 700;
  color: var(--black);
  line-height: 1;
  letter-spacing: -0.03em;
}

.weight-trend .target {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--grey);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-bottom: 6px;
}

/* ====== ANIMATIONS ====== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* ====== RESPONSIVE ====== */
@media (min-width: 521px) {
  .app {
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
  }
}

/* ====== SCROLLBAR ====== */
.chat::-webkit-scrollbar { width: 4px; }
.chat::-webkit-scrollbar-track { background: transparent; }
.chat::-webkit-scrollbar-thumb { background: var(--border); }

.input-actions::-webkit-scrollbar { display: none; }
.input-actions { scrollbar-width: none; -ms-overflow-style: none; }

/* ====== DARK MODE ====== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #111;
    --bg-alt:      #1A1A1A;
    --text:        #F5F0EC;
    --text-light:  #888;
    --text-muted:  #555;
    --border:      rgba(255,255,255,0.1);
    --white:       #1A1A1A;
    --off-white:   #151515;
    --black:       #F5F0EC;
  }

  body { background: #111; color: #F5F0EC; }

  .msg.bot {
    background: #1A1A1A;
    border-color: rgba(255,255,255,0.1);
    color: #F5F0EC;
  }

  .msg.user {
    background: var(--pink);
    color: #111;
  }

  .action-btn:hover, .action-btn:active,
  .quick-reply:hover, .quick-reply:active {
    background: var(--pink);
    color: #111;
    border-color: var(--pink);
  }

  .send-btn {
    background: var(--pink);
    color: #111;
  }
  .send-btn:hover { background: var(--pink-d); }
}