/* ==============================================
   Sleep Calculator — styled to match GoCalc Date Range Calculator
   ============================================== */

:root {
    --isc-primary:    #2563eb;
    --isc-primary-h:  #1d4ed8;
    --isc-primary-lt: #eff6ff;
    --isc-accent:     #f59e0b;
    --isc-green:      #16a34a;
    --isc-green-lt:   #f0fdf4;
    --isc-bg:         #f8fafc;
    --isc-surface:    #ffffff;
    --isc-border:     #e2e8f0;
    --isc-border-h:   #cbd5e1;
    --isc-text:       #1e293b;
    --isc-muted:      #64748b;
    --isc-muted-lt:   #94a3b8;
    --isc-radius:     12px;
    --isc-btn-r:      8px;
    --isc-shadow:     0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
}

.ict-sleep-calc {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--isc-surface);
    border-radius: var(--isc-radius);
    border: 1px solid var(--isc-border);
    box-shadow: var(--isc-shadow);
    overflow: hidden;
    max-width: 560px;
    margin: 0 auto 28px;
    color: var(--isc-text);
}

/* ── Header ─────────────────────────────────── */
.isc-header {
    background: var(--isc-surface);
    padding: 24px 24px 16px;
    text-align: center;
    border-bottom: 1px solid var(--isc-border);
}

.isc-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--isc-text);
    margin-bottom: 4px;
}

.isc-tagline {
    font-size: 0.82rem;
    color: var(--isc-muted);
    margin: 0;
}

/* ── Tabs ───────────────────────────────────── */
.isc-tabs {
    display: flex;
    flex-direction: column;
    background: var(--isc-bg);
    border-bottom: 1px solid var(--isc-border);
}

.isc-tab {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: transparent;
    color: var(--isc-muted);
    border: none;
    border-left: 3px solid transparent;
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.15s;
    text-align: left;
    border-bottom: 1px solid var(--isc-border);
}

.isc-tab:last-child { border-bottom: none; }
.isc-tab:hover { background: var(--isc-surface); color: var(--isc-text); }

.isc-tab.active {
    background: var(--isc-surface);
    color: var(--isc-text);
    border-left-color: var(--isc-primary);
    font-weight: 600;
}

.isc-tab-icon { font-size: 1rem; }
.isc-tab strong { color: var(--isc-text); }

/* ── Panels ─────────────────────────────────── */
.isc-panel { display: none; padding: 24px; background: var(--isc-surface); }
.isc-panel.active { display: block; }

.isc-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--isc-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.isc-input-row { margin-bottom: 18px; }

.isc-time-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--isc-surface);
    border: 1px solid var(--isc-border);
    border-radius: var(--isc-btn-r);
    color: var(--isc-text);
    font-size: 1.5rem;
    font-weight: 300;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-sizing: border-box;
}

.isc-time-input:focus {
    outline: none;
    border-color: var(--isc-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* Sleep now info box */
.isc-now-info {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    background: var(--isc-primary-lt);
    border: 1px solid #bfdbfe;
    border-radius: var(--isc-btn-r);
    padding: 14px 16px;
    margin-bottom: 18px;
}

.isc-now-icon { font-size: 1.8rem; line-height: 1; }

.isc-now-info p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--isc-muted);
    line-height: 1.6;
}

.isc-now-info p strong { color: var(--isc-text); }

/* ── Calculate button ───────────────────────── */
.isc-calc-btn {
    width: 100%;
    padding: 13px;
    background: var(--isc-primary);
    color: #fff;
    border: none;
    border-radius: var(--isc-btn-r);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, transform 0.08s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.isc-calc-btn::before { content: '📅'; font-size: 1rem; }
.isc-calc-btn:hover   { background: var(--isc-primary-h); }
.isc-calc-btn:active  { transform: scale(0.98); }

/* ── Results ────────────────────────────────── */
.isc-result { display: none; margin-top: 22px; }
.isc-result.visible { display: block; }

.isc-result-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--isc-muted);
    margin-bottom: 12px;
}

.isc-cycles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
    gap: 10px;
}

.isc-cycle-card {
    background: var(--isc-bg);
    border: 1px solid var(--isc-border);
    border-radius: var(--isc-btn-r);
    padding: 14px 10px;
    text-align: center;
    transition: border-color 0.15s, box-shadow 0.15s;
    position: relative;
}

.isc-cycle-card:hover {
    border-color: var(--isc-border-h);
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.isc-cycle-card.recommended {
    border-color: var(--isc-green);
    background: var(--isc-green-lt);
}

.isc-cycle-card.recommended::before {
    content: '★ Best';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--isc-green);
    color: #fff;
    font-size: 0.58rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 20px;
    white-space: nowrap;
    letter-spacing: 0.5px;
}

.isc-cycle-time {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--isc-primary);
    line-height: 1.2;
    margin-bottom: 4px;
}

.isc-cycle-card.recommended .isc-cycle-time { color: var(--isc-green); }

.isc-cycle-label {
    font-size: 0.68rem;
    color: var(--isc-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.isc-cycle-duration {
    font-size: 0.7rem;
    color: var(--isc-muted-lt);
    margin-top: 3px;
}

.isc-fallasleep-note {
    font-size: 0.73rem;
    color: var(--isc-muted);
    text-align: center;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--isc-border);
}

/* ── Info section ───────────────────────────── */
.isc-info {
    background: var(--isc-bg);
    border-top: 1px solid var(--isc-border);
    padding: 20px;
}

.isc-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.isc-info-card {
    background: var(--isc-surface);
    border: 1px solid var(--isc-border);
    border-radius: var(--isc-btn-r);
    padding: 14px 12px;
    text-align: center;
}

.isc-info-icon  { font-size: 1.3rem; margin-bottom: 6px; }
.isc-info-title { font-size: 0.76rem; font-weight: 700; color: var(--isc-text); margin-bottom: 4px; }
.isc-info-text  { font-size: 0.71rem; color: var(--isc-muted); line-height: 1.5; }

/* ── Responsive ─────────────────────────────── */
@media (max-width: 480px) {
    .isc-header  { padding: 18px 16px 14px; }
    .isc-panel   { padding: 16px; }
    .isc-info    { padding: 14px; }
    .isc-info-grid { grid-template-columns: 1fr; gap: 8px; }
    .isc-cycles-grid { grid-template-columns: repeat(3, 1fr); }
    .isc-cycle-time  { font-size: 1.1rem; }
}