/* ─── SPRINT LAYOUT ─── */
.sprint-main {
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: stretch;
}

.sprint-view {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  display: flex;
  flex-direction: column;
}

/* ─── HEADER ─── */
.sprint-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(248,246,241,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.sprint-header-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 14px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.sprint-steps-indicator {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--fg-secondary);
}
.sprint-steps-indicator .step-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border);
}
.sprint-steps-indicator .step-dot.active {
  background: var(--accent);
}
.sprint-steps-indicator .step-dot.done {
  background: var(--fg);
}

/* ─── AUTH GATE ─── */
.auth-gate {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
}
.auth-card {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px;
  width: 100%;
  max-width: 440px;
  text-align: center;
}
.auth-logo {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin-bottom: 32px;
}
.auth-logo .logo-mark {
  width: 36px; height: 36px; background: var(--fg); color: var(--bg);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-family: 'Playfair Display', serif; font-weight: 700; font-size: 18px;
}
.auth-logo .logo-name {
  font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 600; color: var(--fg);
}
.auth-card h1 {
  font-family: 'Playfair Display', serif; font-size: 28px; font-weight: 600;
  margin-bottom: 10px; color: var(--fg);
}
.auth-card > p { font-size: 15px; color: var(--fg-secondary); margin-bottom: 32px; }

/* Auth tabs */
.auth-tabs {
  display: flex; gap: 0; border-bottom: 2px solid var(--border);
  margin-bottom: 28px;
}
.auth-tab {
  flex: 1; background: none; border: none; padding: 10px;
  font-family: 'DM Sans', sans-serif; font-size: 14px; font-weight: 500;
  color: var(--fg-secondary); cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: color 0.2s;
}
.auth-tab.active { color: var(--fg); border-bottom-color: var(--accent); }

/* Auth forms */
.auth-form {
  display: flex; flex-direction: column; gap: 14px;
}
.auth-form input {
  padding: 12px 16px; border: 1px solid var(--border);
  border-radius: 10px; font-family: 'DM Sans', sans-serif;
  font-size: 15px; background: var(--bg); color: var(--fg);
  transition: border-color 0.2s;
  width: 100%;
}
.auth-form input:focus { outline: none; border-color: var(--accent); }
.auth-error { font-size: 13px; color: #D94F4F; min-height: 18px; margin: 0; }

/* ─── BRIEF BANNER ─── */
.brief-banner {
  background: #FFFFFF; border: 1px solid var(--border);
  border-radius: 14px; padding: 18px 20px;
  margin-bottom: 24px;
}
.brief-label {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--accent);
  margin-bottom: 8px;
}
.brief-text { font-size: 14px; color: var(--fg); line-height: 1.6; }

/* ─── THREAD ─── */
.sprint-thread {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}
.thread-empty {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: var(--fg-secondary); gap: 16px; padding: 60px 0;
}
.thread-empty-icon { opacity: 0.3; }
.thread-empty p { font-size: 15px; text-align: center; max-width: 320px; }

/* Message bubbles */
.msg { display: flex; flex-direction: column; gap: 4px; }
.msg-user { align-items: flex-end; }
.msg-ai { align-items: flex-start; }

.msg-bubble {
  max-width: 85%;
  background: #FFFFFF; border: 1px solid var(--border);
  border-radius: 16px; border-bottom-left-radius: 4px;
  padding: 16px 20px; font-size: 15px; line-height: 1.7;
  color: var(--fg);
}
.msg-user .msg-bubble {
  background: var(--fg); color: var(--bg-inv);
  border-radius: 16px; border-bottom-right-radius: 4px; border-bottom-left-radius: 16px;
}

/* Step headers in AI messages */
.msg-step-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.msg-step-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--fg); color: var(--bg); font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Playfair Display', serif;
}
.msg-step-name { font-family: 'Playfair Display', serif; font-size: 17px; font-weight: 600; color: var(--fg); }

/* Step indicator dots */
.step-dots { display: flex; gap: 6px; margin-top: 8px; }
.step-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.step-dot.done { background: var(--fg); }
.step-dot.active { background: var(--accent); animation: pulse 2s ease-in-out infinite; }
.step-dot.pending { background: var(--border); }

/* Markdown in messages */
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3 {
  font-family: 'Playfair Display', serif; margin: 16px 0 8px;
  line-height: 1.3;
}
.msg-bubble h1 { font-size: 20px; }
.msg-bubble h2 { font-size: 17px; }
.msg-bubble h3 { font-size: 15px; }
.msg-bubble p { margin: 0 0 10px; }
.msg-bubble ul, .msg-bubble ol { margin: 8px 0; padding-left: 20px; }
.msg-bubble li { margin-bottom: 4px; }
.msg-bubble code {
  background: rgba(17,17,17,0.06); padding: 2px 6px; border-radius: 4px;
  font-size: 13px; font-family: 'Courier New', monospace;
}
.msg-bubble pre { background: #1A1A1A; color: #E5E5E5; padding: 14px 16px; border-radius: 8px; overflow-x: auto; margin: 12px 0; }
.msg-bubble pre code { background: none; padding: 0; color: inherit; }
.msg-bubble table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 14px; }
.msg-bubble th, .msg-bubble td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.msg-bubble th { background: var(--bg); font-weight: 600; }
.msg-bubble tr:nth-child(even) { background: rgba(0,0,0,0.02); }

/* Loading state */
.msg-generating .msg-bubble {
  display: flex; align-items: center; gap: 12px;
  color: var(--fg-secondary); font-size: 14px;
}
.spin { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── INPUT AREA ─── */
.sprint-input-area {
  background: #FFFFFF; border: 1px solid var(--border);
  border-radius: 16px; padding: 16px;
  display: flex; flex-direction: column; gap: 10px;
}
#briefInput {
  width: 100%; border: none; outline: none; resize: none;
  font-family: 'DM Sans', sans-serif; font-size: 15px; line-height: 1.6;
  color: var(--fg); background: transparent; min-height: 80px;
}
#briefInput::placeholder { color: var(--fg-secondary); }
.input-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 8px; border-top: 1px solid var(--border);
}
.input-hint { font-size: 12px; color: var(--fg-secondary); }

/* Buttons */
.btn-primary {
  background: var(--fg); color: var(--bg);
  border: none; border-radius: 10px;
  padding: 10px 20px; font-family: 'DM Sans', sans-serif;
  font-size: 14px; font-weight: 600; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  transition: background 0.2s;
}
.btn-primary:hover { background: #333; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary.btn-lg { padding: 14px 28px; font-size: 15px; border-radius: 12px; }
.btn-ghost {
  background: none; border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 14px;
  font-family: 'DM Sans', sans-serif; font-size: 13px; font-weight: 500;
  color: var(--fg-secondary); cursor: pointer; transition: all 0.2s;
}
.btn-ghost:hover { border-color: var(--fg); color: var(--fg); }

.btn-loading { display: flex; align-items: center; gap: 8px; }
.hidden { display: none !important; }

/* Sprint status bar */
.status-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: var(--accent);
  color: var(--fg); border-radius: 10px;
  font-size: 13px; font-weight: 500;
  margin-bottom: 16px;
}
.status-bar .spin { color: var(--fg); }

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

/* Responsive */
@media (max-width: 768px) {
  .sprint-view { padding: 24px 16px 60px; }
  .auth-card { padding: 32px 24px; }
  .sprint-header-inner { padding: 12px 16px; }
  .sprint-steps-indicator { display: none; }
}