/* ===========================
   layout.css
   Page scaffolding: header, date navigation, main container,
   age display, milestone card, and responsive max-width rules.
   =========================== */

/* ---- Header ---- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 18px 0;
  max-width: 540px;
  margin: 0 auto;
  gap: 12px;
}

.app-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(20px, 5vw, 24px);
  font-weight: 400;
  letter-spacing: -0.3px;
  flex: 1;
  min-width: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.icon-btn {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid rgba(0,0,0,.08);
  background: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  touch-action: manipulation;
  color: var(--ink-mid);
  transition: all 0.15s;
}

.icon-btn:active {
  background: var(--c4);
  border-color: var(--c4);
  color: var(--ink);
  transform: scale(0.94);
}

.today-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-mid);
  background: var(--white);
  border: 1px solid rgba(0,0,0,.08);
  border-radius: 20px;
  padding: 6px 14px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s;
  letter-spacing: 0.3px;
}

.today-btn:active {
  background: var(--c4);
  border-color: var(--c4);
  color: var(--ink);
}

/* ---- Date Navigation ---- */
.date-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 540px;
  margin: 16px auto 0;
  padding: 0 18px;
}

.nav-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--white);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  touch-action: manipulation;
  flex-shrink: 0;
  color: var(--ink);
  box-shadow: var(--shadow-btn);
  transition: all 0.15s;
}

.nav-btn:active {
  transform: scale(0.94);
  background: var(--c4);
}

.nav-btn:disabled {
  opacity: 0.3;
  pointer-events: none;
}

.date-display {
  flex: 1;
  text-align: center;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.2px;
  color: var(--ink);
}

/* ---- Main Layout ---- */
.app-main {
  max-width: 540px;
  margin: 0 auto;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---- Baby Age Display ---- */
.age-display {
  background: linear-gradient(135deg, var(--c2) 0%, var(--c4) 100%);
  border-radius: var(--radius-card);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-card);
}

.age-display svg {
  flex-shrink: 0;
  color: #7c5cbf;
}

.age-display #ageText {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.2px;
}

/* ---- Milestone Card ---- */
.milestone-card {
  background: linear-gradient(135deg, var(--c1) 0%, var(--c3) 100%);
  border-radius: var(--radius-card);
  padding: 12px 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  box-shadow: var(--shadow-card);
  position: relative;
  animation: slideIn 0.3s ease;
}

.milestone-card[hidden] {
  display: none;
}

.milestone-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #c27c5a;
  flex-shrink: 0;
}

.milestone-content {
  flex: 1;
  min-width: 0;
  padding-right: 16px;
}

.milestone-label {
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-mid);
  letter-spacing: 0.7px;
  text-transform: uppercase;
  margin-bottom: 2px;
}

.milestone-text {
  font-size: 13px;
  color: var(--ink);
  line-height: 1.4;
  letter-spacing: -0.1px;
}

.milestone-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 22px;
  height: 22px;
  border: none;
  background: rgba(255,255,255,0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink-mid);
  transition: all 0.15s;
}

.milestone-close:active {
  background: rgba(255,255,255,0.7);
}

/* ---- Responsive max-width ---- */
@media (min-width: 541px) {
  .app-header,
  .date-nav,
  .app-main {
    max-width: 540px;
  }
}