@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;1,400&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:            #1c1c1e;
  --surface:       #232325;
  --surfaceAlt:    #2a2a2c;
  --surfaceAltHi:  #2f2f31;
  --border:        #3a3a3c;
  --borderSoft:    #2e2e30;
  --text:          #e8e8e8;
  --textSoft:      #c9c5be;
  --muted:         #8e8e93;
  --bone:          #e8e2d5;
  --gold:          #c9a96e;
  --red:           #c25450;
}

html, body {
  height: 100%;
  background: #0f0f10;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  -webkit-font-smoothing: antialiased;
}

/* ── Column ── */
.col {
  position: relative;
  width: 100%;
  max-width: 600px;
  min-height: 100dvh;
  margin: 0 auto;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

@media (min-width: 640px) {
  .col {
    border-left: 1px solid var(--borderSoft);
    border-right: 1px solid var(--borderSoft);
  }
}

@media (min-width: 900px) {
  .col { max-width: min(90vw, 960px); }
  .msg-ai { font-size: 24px; }
  .chat-chrome { padding: 20px 40px 14px; }
  .thread { padding: 28px 40px 8px; gap: 20px; }
  .composer { padding: 16px 40px 28px; }
  .done-footer { padding: 20px 40px 32px; }
  .signup-panel { padding: 32px 40px 48px; max-width: min(90vw, 960px); }
}

/* ── Screen visibility ── */
.screen { display: none; flex-direction: column; flex: 1; }
.screen.active { display: flex; }

/* ══════════════════════════════════
   BUTTONS
══════════════════════════════════ */
.slab-btn {
  display: block;
  width: 100%;
  background: var(--bone);
  color: #111;
  border: none;
  border-radius: 0;
  padding: 15px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms;
  text-align: center;
}

.slab-btn:disabled {
  background: var(--surface);
  color: var(--muted);
  cursor: default;
}

.slab-btn:not(:disabled):active { background: #d6d0c2; }

.slab-btn:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 2px;
}

/* ══════════════════════════════════
   CHAT
══════════════════════════════════ */
#screen-chat { height: 100dvh; }

/* Chrome */
.chat-chrome {
  flex-shrink: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 16px 22px 12px;
  border-bottom: 1px solid var(--borderSoft);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.wordmark-s {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 17px;
  color: var(--textSoft);
}

.streak-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.streak-counter .gold {
  color: var(--gold);
  font-weight: 500;
}

.menu-btn {
  background: none;
  border: none;
  color: var(--textSoft);
  font-size: 18px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}
.menu-btn:hover { color: var(--bone); }

/* Thread */
.thread {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px 22px 8px;
  scroll-behavior: smooth;
}

/* ── Opening state: centred, Google-start-page feel ── */
#screen-chat.opening .thread {
  justify-content: flex-end;
  padding-bottom: 28px;
}

#screen-chat.opening .composer {
  border-top: none;
  padding-top: 0;
}

#screen-chat.opening .chat-chrome {
  border-bottom: none;
}

/* Push the whole centred block toward the middle of the viewport */
#screen-chat.opening .thread::before {
  content: '';
  flex: 1.4;
}

#screen-chat.opening .msg-ai {
  max-width: 100%;
}

#screen-chat.opening .msg-ai:first-child {
  font-size: 30px;
}

@media (min-width: 900px) {
  #screen-chat.opening .msg-ai:first-child { font-size: 38px; }
}

/* AI message */
.msg-ai {
  max-width: 88%;
  border-left: 2px solid var(--gold);
  padding-left: 14px;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--text);
  animation: msgIn 180ms ease-out both;
}

.msg-ai .soft { color: var(--textSoft); }

/* User bubble */
.msg-user {
  align-self: flex-end;
  max-width: 82%;
  background: var(--surfaceAltHi);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
  padding: 11px 13px;
  border-radius: 4px;
  animation: msgIn 180ms ease-out both;
}

/* Thinking state */
.msg-thinking {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 22px;
  color: var(--muted);
  padding-left: 16px;
}

/* Error inline */
.msg-error {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: lowercase;
  color: var(--red);
  padding-left: 16px;
}

@keyframes msgIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .msg-ai, .msg-user { animation: none; }
}

/* Composer */
.composer {
  flex-shrink: 0;
  border-top: 1px solid var(--borderSoft);
  padding: 14px 22px 22px;
}

.composer textarea {
  display: block;
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 8px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  caret-color: var(--gold);
  resize: none;
  outline: none;
  min-height: 76px;
  max-height: 180px;
  overflow-y: auto;
}

.composer textarea::placeholder {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--muted);
}

.composer textarea:focus-visible { outline: none; }

.composer .slab-btn { margin-top: 14px; }

/* Done footer */
.done-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--borderSoft);
  padding: 18px 22px 28px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.done-footer .see-you {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 15px;
  color: var(--textSoft);
}

.done-footer .done-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

/* Done state - dim user bubbles */
.done .msg-user {
  background: var(--surfaceAlt);
  color: var(--textSoft);
  font-size: 13.5px;
  transition: background 400ms, color 400ms;
}

/* ══════════════════════════════════
   SIGN-UP PANEL
   Slides up from bottom after day 1
══════════════════════════════════ */
.signup-panel {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 520px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 28px 22px 40px;
  z-index: 20;
  animation: slideUp 300ms ease-out both;
}

@keyframes slideUp {
  from { transform: translateX(-50%) translateY(100%); opacity: 0; }
  to   { transform: translateX(-50%) translateY(0);   opacity: 1; }
}

.signup-view { display: flex; flex-direction: column; gap: 0; }

.signup-heading {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 28px;
  line-height: 1;
  color: var(--text);
  margin-bottom: 8px;
}

.signup-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--textSoft);
  margin-bottom: 24px;
}

.field { margin-bottom: 20px; }

.field input {
  display: block;
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 8px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 16px;
  color: var(--text);
  caret-color: var(--gold);
  outline: none;
  appearance: none;
}

.field input::placeholder {
  font-family: Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--muted);
}

.field input:focus { border-bottom-color: var(--textSoft); }

.field-error {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--red);
  margin-top: 6px;
  min-height: 14px;
  text-transform: lowercase;
}

.signup-skip {
  display: block;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 14px;
  cursor: pointer;
}

.signup-skip:hover { color: var(--textSoft); }