.datetime-input { position: relative; width: 100%; }
.datetime-input__error { align-items: center; color: var(--danger); display: flex; font-size: 0.875rem; gap: 0.25rem; margin-top: 0.25rem; }
.datetime-input__error .icon-xs { flex-shrink: 0; }
.datetime-input__field { background-color: transparent; border: none; color: var(--text); cursor: pointer; font-family: var(--font-ui), sans-serif; font-size: 1rem; font-weight: var(--font-semibold); line-height: 1.4; min-height: var(--field-input-height); outline: none; padding: 0.4rem 0.85rem 0.4rem 2.4rem; transition: color 0.2s ease; width: 100%; }
.datetime-input__field::placeholder { color: var(--text-muted); }
.datetime-input__field:focus { outline: none; }
.datetime-input__field-group { align-items: center; cursor: pointer; display: flex; flex: 1 1 50%; padding-left: 0.25rem; position: relative; } /* extends .input-base */
.datetime-input__icon { color: var(--text-muted); font-size: 1rem; left: 0.9rem; pointer-events: none; position: absolute; z-index: 1; }
.datetime-input__wrapper { display: flex; gap: 0.5rem; width: 100%; }
.datetime-input--focused .datetime-input__field-group { border-color: var(--accent); box-shadow: var(--focus-ring); }
.datetime-input--invalid .datetime-input__field-group { border-color: var(--danger); }
.datetime-input--invalid.datetime-input--focused .datetime-input__field-group { box-shadow: 0 0 0 3px rgba(var(--danger-rgb), 0.15); }
.datetime-picker__actions { display: flex; gap: 0.75rem; justify-content: stretch; margin-top: 1.25rem; }
.datetime-picker__actions .btn { flex: 1; justify-content: center; }
.datetime-picker__calendar { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-strong), 0 0 0 1px var(--border); max-width: 320px; padding: 1.25rem; width: 90%; }
.datetime-picker__day { background: none; border: none; border-radius: var(--radius-md); color: var(--text); cursor: pointer; font-size: 0.875rem; font-weight: var(--font-medium); padding: 0.625rem; transition: background-color 0.15s ease, color 0.15s ease; }
.datetime-picker__day:disabled { cursor: not-allowed; opacity: 0.3; }
.datetime-picker__day:hover:not(:disabled):not(.datetime-picker__day--selected) { background: var(--surface-hover); }
.datetime-picker__day--other-month { color: var(--text-muted); opacity: 0.4; }
.datetime-picker__day--selected { background: var(--accent); color: var(--accent-text); font-weight: var(--font-semibold); }
.datetime-picker__day--selected:hover { background: color-mix(in srgb, var(--accent) 85%, var(--mix-black)); }
.datetime-picker__day--today:not(.datetime-picker__day--selected) { background: rgba(var(--accent-rgb), 0.1); color: var(--accent); font-weight: var(--font-bold); }
.datetime-picker__days { display: grid; gap: 0.25rem; grid-template-columns: repeat(7, 1fr); }
.datetime-picker__header { align-items: center; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; margin-bottom: 0.75rem; padding-bottom: 0.75rem; }
.datetime-picker__nav { align-items: center; background: var(--surface-alt); border: 1px solid var(--border); border-radius: var(--radius-md); color: var(--text-muted); cursor: pointer; display: flex; height: 2rem; justify-content: center; transition: var(--transition-interactive); width: 2rem; }
.datetime-picker__nav:hover { background: var(--surface-hover); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); color: var(--accent); }
.datetime-picker__overlay { align-items: center; backdrop-filter: blur(2px); background: var(--backdrop); display: flex; inset: 0; justify-content: center; position: fixed; z-index: 9999; }
.datetime-picker__period-btn { background: var(--surface-alt); border: 1px solid var(--border); border-radius: var(--radius-md); color: var(--text-muted); cursor: pointer; flex: 1; font-size: 0.875rem; font-weight: var(--font-semibold); padding: 0.5rem 0.75rem; transition: var(--transition-interactive); }
.datetime-picker__period-btn:hover:not(.datetime-picker__period-btn--active) { background: var(--surface-hover); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.datetime-picker__period-btn--active { background: rgba(var(--accent-rgb), 0.12); border-color: var(--accent); color: var(--accent); }
.datetime-picker__period-toggle { display: flex; gap: 0.5rem; justify-content: center; margin-bottom: 0.75rem; }
.datetime-picker__time { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-strong), 0 0 0 1px var(--border); max-width: 280px; padding: 1.25rem; width: 90%; }
.datetime-picker__time .datetime-picker__header { border-bottom: none; justify-content: center; margin-bottom: 0.5rem; padding-bottom: 0; }
.datetime-picker__time-group { flex: 1; text-align: center; }
.datetime-picker__time-group label { color: var(--text-muted); display: block; font-size: var(--text-xs); font-weight: var(--font-semibold); letter-spacing: var(--letter-spacing-wide); margin-bottom: 0.5rem; text-transform: uppercase; }
.datetime-picker__time-inputs { align-items: center; display: flex; gap: 0.75rem; margin: 1rem 0; }
.datetime-picker__time-separator { align-self: center; color: var(--text-muted); font-size: 1.25rem; font-weight: var(--font-semibold); margin-top: 1.5rem; }
.datetime-picker__title { color: var(--text); font-size: 0.9375rem; font-weight: var(--font-semibold); letter-spacing: -0.01em; }
.datetime-picker__weekday { color: var(--text-muted); font-size: 0.75rem; font-weight: var(--font-semibold); padding: 0.5rem 0; text-align: center; }
.datetime-picker__weekdays { display: grid; gap: 0.25rem; grid-template-columns: repeat(7, 1fr); margin-bottom: 0.5rem; }
.datetime-spinner { align-items: center; background: var(--surface-alt); border: 1px solid var(--border); border-radius: var(--radius); display: flex; flex-direction: column; gap: 0.25rem; padding: 0.5rem; transition: border-color 0.2s ease, box-shadow 0.2s ease; }
.datetime-spinner:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.datetime-spinner__btn { align-items: center; background: transparent; border: none; border-radius: var(--radius-md); color: var(--text-muted); cursor: pointer; display: flex; height: 1.75rem; justify-content: center; transition: background-color 0.15s ease, color 0.15s ease, transform 0.15s ease; width: 2.5rem; }
.datetime-spinner__btn:active { transform: scale(0.95); }
.datetime-spinner__btn:hover { background: var(--surface-hover); color: var(--accent); }
.datetime-spinner__value { color: var(--text); font-size: 1.75rem; font-variant-numeric: tabular-nums; font-weight: var(--font-semibold); letter-spacing: 0.02em; min-width: 2.5rem; }