/* ── Design tokens ─────────────────────────────────────── */
:root {
  --font-body: 'Inter', system-ui, sans-serif;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);

  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;    --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;    --space-10: 2.5rem; --space-12: 3rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Light mode — warm sage palette */
  --color-bg:             #f5f4f0;
  --color-surface:        #faf9f6;
  --color-surface-2:      #ffffff;
  --color-border:         #dedad4;
  --color-divider:        #e8e5e0;

  --color-text:           #2a2722;
  --color-text-muted:     #7a7670;
  --color-text-faint:     #b5b2ad;
  --color-text-inverse:   #f9f8f4;

  --color-primary:        #3d8b7a;
  --color-primary-hover:  #2e7063;
  --color-primary-active: #1f5549;
  --color-primary-light:  #e6f2f0;
  --color-primary-mid:    #c2ddd9;

  --color-user-bubble:    #3d8b7a;
  --color-user-text:      #ffffff;
  --color-coach-bubble:   #ffffff;
  --color-coach-border:   #e0dbd5;

  --color-warning:        #8b5a2b;

  --shadow-sm: 0 1px 3px rgba(40, 35, 25, 0.08);
  --shadow-md: 0 4px 12px rgba(40, 35, 25, 0.10);
  --shadow-lg: 0 8px 24px rgba(40, 35, 25, 0.12);
}

[data-theme="dark"] {
  --color-bg:             #181715;
  --color-surface:        #1e1d1b;
  --color-surface-2:      #252422;
  --color-border:         #363330;
  --color-divider:        #2c2a28;

  --color-text:           #d4d1cc;
  --color-text-muted:     #7a7875;
  --color-text-faint:     #555350;
  --color-text-inverse:   #2b2a28;

  --color-primary:        #5aab99;
  --color-primary-hover:  #3d9080;
  --color-primary-active: #2a7367;
  --color-primary-light:  #1e2e2c;
  --color-primary-mid:    #2a403d;

  --color-user-bubble:    #3d8b7a;
  --color-user-text:      #ffffff;
  --color-coach-bubble:   #252422;
  --color-coach-border:   #363330;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.45);
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
a, button { transition: color var(--transition), background var(--transition),
                        border-color var(--transition), opacity var(--transition); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px;
                 border-radius: var(--radius-sm); }

/* ── Layout ────────────────────────────────────────────── */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

/* ── Header ────────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
  gap: var(--space-3);
}

.header-left { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }

/* SVG logo — leaf / seedling mark */
.logo-mark {
  width: 36px; height: 36px; flex-shrink: 0;
  color: var(--color-primary);
}

.header-text { min-width: 0; }
.header-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}
.header-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.3;
  margin-top: 2px;
}

.header-actions { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }

.btn-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition);
}
.btn-icon:hover { background: var(--color-divider); color: var(--color-text); }
.btn-icon:active { background: var(--color-border); }

.btn-new-session {
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-mid);
  white-space: nowrap;
}
.btn-new-session:hover { background: var(--color-primary-mid); }
.btn-new-session:active { background: var(--color-primary); color: var(--color-text-inverse); }

/* ── Chat area ─────────────────────────────────────────── */
.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  scroll-behavior: smooth;
}

/* Welcome state */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-12) var(--space-8);
  gap: var(--space-4);
  animation: fadeIn 0.4s ease;
}
.welcome-icon {
  width: 64px; height: 64px;
  color: var(--color-primary);
  opacity: 0.85;
}
.welcome h1 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
}
.welcome p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 46ch;
  line-height: 1.65;
}
.welcome-starters {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  max-width: 440px;
  margin-top: var(--space-2);
}
.starter-btn {
  text-align: left;
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  line-height: 1.45;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.starter-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-mid);
  color: var(--color-text);
}
.starter-btn:active { background: var(--color-primary-mid); }

/* Message rows */
.message-row {
  display: flex;
  gap: var(--space-3);
  animation: slideUp 0.25s ease;
}
.message-row.user { flex-direction: row-reverse; }

.avatar {
  width: 32px; height: 32px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  font-weight: 600;
}
.avatar.coach {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-mid);
}
.avatar.user {
  background: var(--color-user-bubble);
  color: var(--color-user-text);
}

.bubble {
  max-width: min(72ch, 78%);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble.coach {
  background: var(--color-coach-bubble);
  border: 1px solid var(--color-coach-border);
  box-shadow: var(--shadow-sm);
  border-top-left-radius: var(--radius-sm);
  color: var(--color-text);
}
.bubble.user {
  background: var(--color-user-bubble);
  color: var(--color-user-text);
  border-top-right-radius: var(--radius-sm);
}

/* Typing indicator */
.typing-row { align-items: flex-end; }
.typing-bubble {
  background: var(--color-coach-bubble);
  border: 1px solid var(--color-coach-border);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-lg);
  border-top-left-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--color-text-faint);
  animation: bounce 1.2s infinite;
}
.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

/* ── Input area ────────────────────────────────────────── */
.input-area {
  padding: var(--space-4) var(--space-6) var(--space-5);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}
.input-row {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  background: var(--color-surface-2);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-row:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 15%, transparent);
}
#message-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--color-text);
  resize: none;
  max-height: 160px;
  min-height: 24px;
  line-height: 1.55;
  padding: 0;
}
#message-input::placeholder { color: var(--color-text-faint); }

.btn-send {
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}
.btn-send:hover { background: var(--color-primary-hover); }
.btn-send:active { background: var(--color-primary-active); transform: scale(0.95); }
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.input-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  margin-top: var(--space-2);
}

/* ── Crisis banner ─────────────────────────────────────── */
.crisis-banner {
  display: none;
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: #664d03;
  line-height: 1.5;
  margin: 0 var(--space-6) var(--space-2);
}
.crisis-banner.visible { display: block; }
[data-theme="dark"] .crisis-banner {
  background: #2c2200;
  border-color: #665000;
  color: #ffd966;
}

/* ── Animations ────────────────────────────────────────── */
@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-5px); opacity: 1; }
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Mobile ────────────────────────────────────────────── */
@media (max-width: 480px) {
  .header { padding: var(--space-3) var(--space-4); }
  .chat-area { padding: var(--space-4) var(--space-4) var(--space-3); }
  .input-area { padding: var(--space-3) var(--space-4) var(--space-4); }
  .btn-new-session { font-size: var(--text-xs); padding: var(--space-2) var(--space-3); }
  .bubble { max-width: 88%; }
  .crisis-banner { margin: 0 var(--space-4) var(--space-2); }
}

/* ── Persona panel ─────────────────────────────────── */
.persona-tab {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: var(--space-4) var(--space-2);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: background var(--transition), transform var(--transition);
  user-select: none;
}
.persona-tab:hover { background: var(--color-primary-hover); }
.persona-tab.has-data {
  background: var(--color-primary);
  box-shadow: var(--shadow-md), 0 0 0 2px var(--color-primary-mid);
}
.persona-tab.has-data::after {
  content: '✓';
  writing-mode: horizontal-tb;
  display: block;
  text-align: center;
  margin-top: var(--space-2);
  font-size: 10px;
}

.persona-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: oklch(0.1 0 0 / 0.4);
  z-index: 200;
  animation: fadeIn 0.2s ease;
}
.persona-overlay.open { display: block; }

.persona-panel {
  position: fixed;
  top: 0;
  right: -420px;
  width: min(420px, 100vw);
  height: 100dvh;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  z-index: 300;
  overflow-y: auto;
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}
.persona-panel.open { right: 0; }

.persona-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  background: var(--color-surface-2);
}
.persona-panel-header h2 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
}
.persona-panel-header p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  max-width: none;
}

.persona-panel-body {
  padding: var(--space-5) var(--space-6);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.persona-field label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.persona-field .field-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  display: block;
}
.persona-field input[type="text"],
.persona-field input[type="number"],
.persona-field textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--text-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.persona-field input:focus,
.persona-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 15%, transparent);
}
.persona-field input[type="number"] { max-width: 120px; }
.persona-field textarea { min-height: 72px; }

.conditions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}
.condition-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.condition-check input {
  accent-color: var(--color-primary);
  width: 15px; height: 15px;
  flex-shrink: 0;
}
.condition-check:has(input:checked) {
  background: var(--color-primary-light);
  border-color: var(--color-primary-mid);
  color: var(--color-text);
}

.persona-panel-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
  background: var(--color-surface-2);
}
.btn-save-persona {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background var(--transition);
}
.btn-save-persona:hover { background: var(--color-primary-hover); }
.btn-skip-persona {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
}
.btn-skip-persona:hover { background: var(--color-divider); }

@media (prefers-reduced-motion: reduce) {
  .persona-panel { transition: none; }
  .persona-overlay { animation: none; }
}

/* ── Persona nudge (notification above input) ──────────── */
.persona-prompt {
  display: none;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-mid);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-4);
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-sm);
  animation: slideUp 0.25s ease;
}
.persona-prompt.open { display: flex; }

.persona-prompt-content { flex: 1; min-width: 0; }
.persona-prompt-content p {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.5;
  margin: 0;
}
.persona-prompt-msg { display: none; }
.persona-prompt:not(.update-mode) .msg-default { display: block; }
.persona-prompt.update-mode .msg-update { display: block; }

.persona-prompt-link {
  font: inherit;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 0;
  border-radius: var(--radius-sm);
}
.persona-prompt-link:hover { color: var(--color-primary-hover); }

.persona-prompt-close {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}
.persona-prompt-close:hover {
  background: color-mix(in oklab, var(--color-primary) 12%, transparent);
  color: var(--color-text);
}

@media (prefers-reduced-motion: reduce) {
  .persona-prompt { animation: none; }
}