/* Art direction: Advice chatbot → casual, approachable, slightly irreverent
   Palette: dark, moody with warm-cool contrast — charcoal surfaces, electric teal accent
   Typography: Clash Display (display) + Satoshi (body) — modern, clean, confident
   Density: spacious — focus is on a single chat interface */

/* === FONTS === */
@import url('https://api.fontshare.com/v2/css?f[]=clash-display@400,500,600,700&f[]=satoshi@300,400,500,700&display=swap');

:root {
  --font-display: 'Clash Display', 'Arial Black', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Type Scale */
  --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);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing (4px base) */
  --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;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

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

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
}

/* === LIGHT MODE === */
:root, [data-theme="light"] {
  --color-bg:             #f5f4f0;
  --color-surface:        #ffffff;
  --color-surface-2:      #fafaf8;
  --color-surface-offset: #eae8e3;
  --color-divider:        #dddbd6;
  --color-border:         #cdcbc6;

  --color-text:           #1a1a1a;
  --color-text-muted:     #6b6b6b;
  --color-text-faint:     #a0a0a0;
  --color-text-inverse:   #ffffff;

  --color-primary:        #0e8a8a;
  --color-primary-hover:  #0a6e6e;
  --color-primary-active: #085858;
  --color-primary-surface: #e6f5f5;

  --color-user-bubble:    #1a1a1a;
  --color-user-text:      #ffffff;
  --color-bot-bubble:     #f0efeb;
  --color-bot-text:       #1a1a1a;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

/* === DARK MODE === */
[data-theme="dark"] {
  --color-bg:             #0f0f0f;
  --color-surface:        #1a1a1a;
  --color-surface-2:      #222222;
  --color-surface-offset: #161616;
  --color-divider:        #2a2a2a;
  --color-border:         #333333;

  --color-text:           #e8e8e8;
  --color-text-muted:     #999999;
  --color-text-faint:     #5a5a5a;
  --color-text-inverse:   #0f0f0f;

  --color-primary:        #2ec4b6;
  --color-primary-hover:  #26a89c;
  --color-primary-active: #1e8c82;
  --color-primary-surface: #1a2e2c;

  --color-user-bubble:    #2ec4b6;
  --color-user-text:      #0f0f0f;
  --color-bot-bubble:     #1e1e1e;
  --color-bot-text:       #e8e8e8;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f0f0f;
    --color-surface:        #1a1a1a;
    --color-surface-2:      #222222;
    --color-surface-offset: #161616;
    --color-divider:        #2a2a2a;
    --color-border:         #333333;
    --color-text:           #e8e8e8;
    --color-text-muted:     #999999;
    --color-text-faint:     #5a5a5a;
    --color-text-inverse:   #0f0f0f;
    --color-primary:        #2ec4b6;
    --color-primary-hover:  #26a89c;
    --color-primary-active: #1e8c82;
    --color-primary-surface: #1a2e2c;
    --color-user-bubble:    #2ec4b6;
    --color-user-text:      #0f0f0f;
    --color-bot-bubble:     #1e1e1e;
    --color-bot-text:       #e8e8e8;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* === LAYOUT === */
body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* === HEADER === */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  flex-shrink: 0;
  z-index: 10;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--color-primary);
}

.tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

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

/* === THEME TOGGLE === */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: all var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* === GATE SCREEN (mode selection) === */
.gate-screen {
  flex: 1;
  overflow-y: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.gate-content {
  text-align: center;
  max-width: 640px;
  width: 100%;
  animation: fadeIn 0.6s ease-out;
}

.welcome-icon {
  width: 56px;
  height: 56px;
  color: var(--color-primary);
  opacity: 0.8;
  margin: 0 auto var(--space-4);
  display: block;
}

.gate-content h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}

.gate-content p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

/* Gate Yes/No buttons */
.gate-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.gate-btn {
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
  min-width: 120px;
}

.gate-btn-yes {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.gate-btn-yes:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.gate-btn-yes:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.gate-btn-no {
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-divider);
}

.gate-btn-no:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.gate-btn-no:active {
  transform: translateY(0);
}

/* Gate response text (witty reply) */
.gate-response {
  font-size: var(--text-base);
  color: var(--color-primary);
  font-weight: 500;
  min-height: 1.6em;
  opacity: 0;
  transition: opacity 0.3s ease;
  margin-bottom: 0;
}

.gate-response.visible {
  opacity: 1;
}

/* Category cards (Life / Business) */
.category-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  text-align: left;
  margin-bottom: var(--space-6);
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.category-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.category-card:active {
  transform: translateY(0);
}

.category-icon {
  font-size: 2rem;
  line-height: 1;
}

.category-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.category-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Sub-modes panel (expands inline below categories) */
.submodes-panel {
  animation: fadeIn 0.3s ease-out;
}

.submodes-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.submodes-back {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-interactive);
}

.submodes-back:hover {
  background: var(--color-primary-surface);
}

.submodes-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Sub-mode cards (inside submodes panel) */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  text-align: left;
}

.mode-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.mode-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.mode-card:active {
  transform: translateY(0);
}

.mode-card-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.mode-card-name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.mode-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* About link at bottom of gate */
.gate-about-link {
  display: inline-block;
  margin-top: var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.gate-about-link:hover {
  color: var(--color-primary);
}

/* === CHAT AREA === */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  scroll-behavior: smooth;
}

.chat-messages {
  max-width: var(--content-narrow);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* Active mode indicator in chat */
.mode-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
  align-self: center;
}

.mode-indicator:hover {
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
}

.mode-indicator-icon {
  font-size: 0.875rem;
}

.mode-indicator-name {
  font-weight: 500;
}

.mode-indicator-change {
  color: var(--color-primary);
  font-weight: 500;
  margin-left: var(--space-1);
}

/* Hidden utility */
.hidden {
  display: none;
}

.input-area.visible {
  display: block;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === MESSAGES === */
.message {
  display: flex;
  gap: var(--space-3);
  max-width: 85%;
  animation: messageIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message.bot {
  align-self: flex-start;
}

.message-bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.6;
  word-wrap: break-word;
}

.message.user .message-bubble {
  background: var(--color-user-bubble);
  color: var(--color-user-text);
  border-bottom-right-radius: var(--radius-sm);
}

.message.bot .message-bubble {
  background: var(--color-bot-bubble);
  color: var(--color-bot-text);
  border-bottom-left-radius: var(--radius-sm);
}

/* === SHARE BUTTON === */
.share-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  margin-top: var(--space-1);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-faint);
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
  opacity: 0;
}

.message.bot:hover .share-btn {
  opacity: 1;
}

.share-btn:hover {
  color: var(--color-primary);
  background: var(--color-primary-surface);
}

.share-btn svg {
  flex-shrink: 0;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--space-3) var(--space-4);
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-faint);
  animation: bounce 1.4s ease-in-out infinite;
}

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

/* === INPUT AREA === */
.input-area {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  flex-shrink: 0;
}

.input-wrapper {
  max-width: var(--content-narrow);
  margin: 0 auto;
  display: flex;
  gap: var(--space-2);
  align-items: flex-end;
}

.input-field {
  flex: 1;
  min-height: 48px;
  max-height: 120px;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-text);
  resize: none;
  line-height: 1.5;
  overflow-y: auto;
}

.input-field::placeholder {
  color: var(--color-text-faint);
}

.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  transition: all var(--transition-interactive);
}

.send-btn:hover {
  background: var(--color-primary-hover);
}

.send-btn:active {
  background: var(--color-primary-active);
  transform: scale(0.95);
}

.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.send-btn svg {
  width: 20px;
  height: 20px;
}

/* === FOOTER === */
.footer {
  padding: var(--space-2) var(--space-6);
  text-align: center;
  flex-shrink: 0;
}

.footer a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer a:hover {
  color: var(--color-text-muted);
}

/* === ANIMATIONS === */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes messageIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

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

/* === LIMIT MESSAGE === */
.limit-message {
  background: var(--color-primary-surface);
  border: 1px solid var(--color-primary);
  color: var(--color-text);
}

.limit-message strong {
  color: var(--color-primary);
}

.upgrade-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.upgrade-link:hover {
  color: var(--color-primary-hover);
}

/* === PREMIUM MODAL === */
.premium-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.premium-modal.visible {
  opacity: 1;
  pointer-events: auto;
}

.premium-modal-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 420px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.premium-modal.visible .premium-modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  color: var(--color-text-muted);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

.modal-close:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.modal-icon {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.modal-icon svg {
  display: inline-block;
}

.premium-modal-content h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.modal-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.modal-features {
  list-style: none;
  text-align: left;
  margin-bottom: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.modal-features li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text);
}

.modal-features li svg {
  color: var(--color-primary);
  flex-shrink: 0;
  display: inline-block;
}

.modal-upgrade-btn {
  width: 100%;
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-interactive);
}

.modal-upgrade-btn:hover {
  background: var(--color-primary-hover);
}

.modal-upgrade-btn:active {
  background: var(--color-primary-active);
  transform: scale(0.98);
}

.modal-upgrade-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.modal-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
}

/* === SHARE OVERLAY === */
.share-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  backdrop-filter: blur(4px);
}

.share-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.share-card-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.share-overlay.visible .share-card-wrapper {
  transform: scale(1);
}

#shareCanvas {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-width: 90vw;
  max-height: 60vh;
  object-fit: contain;
}

.share-actions {
  display: flex;
  gap: var(--space-2);
}

.share-action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
  backdrop-filter: blur(8px);
}

.share-action-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.share-close-btn {
  background: rgba(255, 255, 255, 0.08);
}

.share-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* === MOBILE === */
@media (max-width: 640px) {
  .header {
    padding: var(--space-3) var(--space-4);
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .header-left {
    flex: 1;
    min-width: 0;
  }

  .tagline {
    display: none;
  }

  .share-btn {
    opacity: 1;
  }

  .chat-container {
    padding: var(--space-4);
  }

  .input-area {
    padding: var(--space-3) var(--space-4);
    padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
  }

  .message {
    max-width: 92%;
  }

  .gate-screen {
    padding: var(--space-4);
    align-items: flex-start;
    padding-top: var(--space-8);
  }

  .category-row {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .category-card {
    padding: var(--space-4) var(--space-4);
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
  }

  .category-icon {
    font-size: 1.5rem;
  }

  .category-card .category-desc {
    display: none;
  }

  .mode-grid {
    grid-template-columns: 1fr 1fr;
  }

  .mode-card {
    padding: var(--space-4) var(--space-3);
  }
}

/* iOS keyboard fix — JS handles position:fixed + bottom offset dynamically
   via visualViewport API. No CSS hacks needed — the JS in app_selfhosted.js
   directly sets inline styles on .input-area and .chat-container when
   the keyboard is detected open on touch devices. */