/* ============================================
   DUE DATE CALCULATOR — PureTools
   All classes namespaced .ddc-*
   ============================================ */

.ddc-calculator {
    max-width: 1060px;
    margin: 0 auto;
}

/* ===== Method tabs ===== */
.ddc-tabs {
    display: flex;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.25rem;
    margin-bottom: 1.25rem;
    width: fit-content;
}

.ddc-tab {
    padding: 0.55rem 1.1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: calc(var(--radius) - 2px);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
    min-height: 44px;
}

.ddc-tab:hover {
    color: var(--text);
}

.ddc-tab.active {
    background: var(--primary);
    color: var(--on-primary);
}

/* ===== Layout ===== */
.ddc-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    align-items: start;
}

/* ===== Input card ===== */
.ddc-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ddc-hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.ddc-method-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin: 0;
    padding: 0.65rem 0.8rem;
    background: rgba(var(--primary-rgb), 0.06);
    border-left: 3px solid var(--primary);
    border-radius: 0 4px 4px 0;
}

.ddc-error {
    font-size: 0.85rem;
    color: var(--danger);
    min-height: 1.1em;
    margin: 0;
}

.ddc-disclaimer {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* ===== Results column ===== */
.ddc-results-col {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ddc-empty {
    background: var(--surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* ===== Hero card ===== */
.ddc-hero-card {
    background: var(--brand-gradient);
    border-radius: var(--radius);
    padding: 1.6rem 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.ddc-hero-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 75% 25%, rgba(255,255,255,.15) 0%, transparent 60%);
    pointer-events: none;
}

.ddc-hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255,255,255,.8);
    margin: 0 0 0.35rem;
}

.ddc-hero-date {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--on-primary);
    line-height: 1.1;
    margin-bottom: 0.4rem;
}

.ddc-hero-sub {
    font-size: 0.85rem;
    color: rgba(255,255,255,.85);
    margin: 0;
}

/* ===== Quick stats ===== */
.ddc-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}

.ddc-stat-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.ddc-stat-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.ddc-stat-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.ddc-stat-sm {
    font-size: 0.9rem;
}

/* ===== Progress bar ===== */
.ddc-progress-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.9rem 1rem 0.7rem;
}

.ddc-progress-track {
    position: relative;
    height: 10px;
    background: var(--border);
    border-radius: 999px;
    overflow: visible;
    margin-bottom: 0.4rem;
}

.ddc-progress-bar {
    height: 100%;
    background: var(--brand-gradient);
    border-radius: 999px;
    transition: width 0.4s ease;
    max-width: 100%;
}

.ddc-progress-bar-empty {
    width: 0;
}

/* T1/T2 boundary markers */
.ddc-progress-t2,
.ddc-progress-t3 {
    position: absolute;
    top: -3px;
    width: 2px;
    height: 16px;
    background: var(--bg);
    border-radius: 1px;
}

.ddc-progress-t2 { left: 32.5%; }  /* week 13/40 */
.ddc-progress-t3 { left: 67.5%; }  /* week 27/40 */

.ddc-progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.68rem;
    color: var(--text-muted);
}

/* ===== Trimester cards ===== */
.ddc-trimesters {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ddc-tri-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
}

.ddc-tri-card.ddc-tri-active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.15);
}

.ddc-tri-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.ddc-tri-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
}

.ddc-tri-badge.t1,
.ddc-tri-badge.t2,
.ddc-tri-badge.t3 {
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    border: 1px solid rgba(var(--primary-rgb), 0.22);
}

.ddc-tri-header strong {
    font-size: 0.9rem;
    color: var(--text);
    flex: 1;
}

.ddc-tri-weeks {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.ddc-tri-dates {
    margin-top: 0.3rem;
    padding-left: 2.4rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ===== Milestones ===== */
.ddc-milestones-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.1rem;
}

.ddc-milestones-heading {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ddc-milestones-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.ddc-milestone {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.55rem 0;
    border-bottom: 1px solid var(--border);
}

.ddc-milestone:last-child { border-bottom: none; }

.ddc-milestone-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    flex-shrink: 0;
    margin-top: 0.35rem;
}

.ddc-milestone.past .ddc-milestone-dot   { background: var(--text-muted); }
.ddc-milestone.current .ddc-milestone-dot { background: var(--primary); box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.25); }
.ddc-milestone.upcoming .ddc-milestone-dot { background: var(--border); }

.ddc-milestone-info {
    flex: 1;
    min-width: 0;
}

.ddc-milestone-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    display: block;
}

.ddc-milestone-detail {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.ddc-milestone-date {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
    text-align: right;
}

.ddc-milestone.past .ddc-milestone-name,
.ddc-milestone.past .ddc-milestone-date { color: var(--text-muted); }

.ddc-milestone.current .ddc-milestone-name { color: var(--primary); }
.ddc-milestone.current .ddc-milestone-date { color: var(--primary); }

/* ===== Actions ===== */
.ddc-actions {
    display: flex;
    gap: 0.75rem;
}

.ddc-copy-btn {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 44px;
    padding: 0 1.25rem;
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
    .ddc-layout { grid-template-columns: 1fr; }
    .ddc-tabs { width: 100%; }
    .ddc-tab { flex: 1; text-align: center; }
}

@media (max-width: 640px) {
    .ddc-hero-date { font-size: 1.6rem; }
    .ddc-stats-grid { grid-template-columns: 1fr 1fr; }
    .ddc-actions { flex-direction: column; }
    .ddc-copy-btn { width: 100%; justify-content: center; }
    .ddc-tri-header { flex-wrap: wrap; }
    .ddc-milestone { gap: 0.5rem; }
}