/*
 * Smart Tools Suite — Date Difference Calculator v2
 * Two tabs: Date Difference + Add/Subtract Days
 * calcdaystime.com
 */

.sts-dd {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(26,58,92,.08), 0 8px 28px rgba(26,58,92,.12), 0 24px 56px rgba(26,58,92,.07);
    overflow: hidden;
    max-width: 680px;
    margin: 0 auto 3rem;
    color: #0f1f30;
}
.sts-dd *, .sts-dd *::before, .sts-dd *::after { box-sizing: border-box; }

/* ── Header ── */
.sts-dd__header {
    display: flex; align-items: center; gap: 1.1rem;
    background: #1A3A5C; padding: 1.6rem 2rem; color: #fff;
}
.sts-dd__header-icon {
    flex-shrink: 0; width: 50px; height: 50px;
    background: rgba(255,255,255,.12); border-radius: 11px;
    display: flex; align-items: center; justify-content: center; color: #fff;
}
.sts-dd__header-icon svg { width: 28px; height: 28px; }
.sts-dd__title {
    font-size: 1.35rem; font-weight: 800; color: #fff;
    margin: 0 0 .25rem; letter-spacing: -.4px; line-height: 1.15;
}
.sts-dd__subtitle { font-size: .87rem; color: rgba(255,255,255,.68); margin: 0; font-weight: 500; letter-spacing: .1px; }

/* ── Tabs ── */
.sts-dd__tabs {
    display: flex;
    background: #122840;
    border-bottom: 1px solid rgba(255,255,255,.07);
}
.sts-dd__tab {
    flex: 1; padding: .88rem 1rem;
    font-size: .79rem; font-weight: 700; letter-spacing: .7px; text-transform: uppercase;
    background: transparent; border: none; cursor: pointer;
    color: rgba(255,255,255,.45);
    border-bottom: 3px solid transparent; margin-bottom: -1px;
    transition: all .18s; font-family: inherit;
    display: flex; align-items: center; justify-content: center; gap: .5rem;
}
.sts-dd__tab svg { width: 15px; height: 15px; flex-shrink: 0; }
.sts-dd__tab:hover { color: rgba(255,255,255,.75); background: rgba(255,255,255,.04); }
.sts-dd__tab--active { color: #fff; border-bottom-color: #1D9E75; background: rgba(255,255,255,.06); }

/* ── Panel — WHITE background ── */
.sts-dd__panel {
    background: #fff;
    padding: 1.75rem 2rem;
    border-bottom: 1px solid #dce4ef;
}
.sts-dd__panel[hidden] { display: none; }

/* Presets */
.sts-dd__presets {
    display: flex; align-items: center; gap: .45rem; flex-wrap: wrap; margin-bottom: 1.4rem;
}
.sts-dd__presets-lbl {
    font-size: .68rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2px; color: #2D4A63; flex-shrink: 0;
}
.sts-dd__preset {
    font-size: .72rem; font-weight: 700; letter-spacing: .5px;
    padding: 5px 13px; border-radius: 999px;
    border: 1.5px solid #dce4ef; background: #F7F9FC; color: #1A3A5C;
    cursor: pointer; font-family: inherit; transition: all .15s;
}
.sts-dd__preset:hover { background: #1A3A5C; color: #fff; border-color: #1A3A5C; }

/* Date row */
.sts-dd__date-row {
    display: grid; grid-template-columns: 1fr 44px 1fr;
    gap: .85rem; align-items: flex-start; margin-bottom: 1.2rem;
}
.sts-dd__field { display: flex; flex-direction: column; gap: .45rem; }
.sts-dd__lbl {
    font-size: .7rem; font-weight: 600; text-transform: uppercase;
    letter-spacing: 2px; color: #7a9ab5;
    display: flex; align-items: center; gap: 7px;
}
.sts-dd__dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.sts-dd__dot--start  { background: #1A3A5C; }
.sts-dd__dot--end    { background: #1D9E75; }
.sts-dd__dot--purple { background: #6c63ff; }

.sts-dd__input {
    width: 100%; padding: .8rem 1rem;
    border: 1.8px solid #c4d0de; border-radius: 9px;
    font-size: .97rem; font-weight: 600; color: #0f1f30;
    background: #F7F9FC; outline: none; font-family: inherit;
    transition: border-color .15s, box-shadow .15s, background .15s; letter-spacing: .1px;
}
.sts-dd__input:focus { border-color: #1D9E75; background: #fff; box-shadow: 0 0 0 3px rgba(29,158,117,.1); }
.sts-dd__input::-webkit-calendar-picker-indicator { opacity: .5; cursor: pointer; }
.sts-dd__input::placeholder { color: #a0b4c4; }
.sts-dd__input[type="number"]::-webkit-inner-spin-button { opacity: .4; }

.sts-dd__select {
    width: 100%; padding: .8rem 1rem;
    border: 1.8px solid #c4d0de; border-radius: 9px;
    font-size: .85rem; font-weight: 600; color: #0f1f30;
    background: #F7F9FC; outline: none; font-family: inherit;
    cursor: pointer; transition: border-color .15s;
    text-overflow: ellipsis; overflow: hidden; white-space: nowrap;
    -webkit-appearance: auto; appearance: auto;
}
.sts-dd__select:focus { border-color: #1D9E75; box-shadow: 0 0 0 3px rgba(29,158,117,.1); }

.sts-dd__dayname {
    font-size: .72rem; font-weight: 700; color: #1D9E75;
    min-height: 1.1em; letter-spacing: .8px; text-transform: uppercase;
}

/* Swap button */
.sts-dd__swap {
    width: 44px; height: 44px; margin-top: 30px; flex-shrink: 0;
    border-radius: 50%; border: 1.8px solid #c4d0de;
    background: #F7F9FC; color: #1A3A5C; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all .2s; font-family: inherit;
    -webkit-appearance: none; appearance: none;
    font-size: 20px; line-height: 1;
}
.sts-dd__swap-icon { font-size: 20px; color: #1A3A5C; line-height: 1; display: block; }
.sts-dd__swap:hover { background: #1A3A5C; border-color: #1A3A5C; color: #fff; }
.sts-dd__swap:hover .sts-dd__swap-icon { color: #fff; }

/* Two column row */
.sts-dd__two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .85rem; margin-bottom: 1.2rem; }

/* Weekend: always excludes Sat & Sun — shown in results cards */

/* Error */
.sts-dd__error {
    font-size: .87rem; font-weight: 600; color: #c0392b;
    background: #fdf3f2; border-left: 3px solid #c0392b;
    border-radius: 6px; padding: .55rem .8rem; margin-bottom: .85rem;
}

/* Buttons */
.sts-dd__btn-row { display: flex; gap: .75rem; flex-wrap: wrap; }
.sts-dd__btn-primary {
    padding: .8rem 2rem; background: #1D9E75; color: #fff;
    font-size: .9rem; font-weight: 700; border: none; border-radius: 9px;
    cursor: pointer; font-family: inherit; letter-spacing: .5px; text-transform: uppercase;
    transition: background .15s, transform .1s;
}
.sts-dd__btn-primary:hover  { background: #157a5a; }
.sts-dd__btn-primary:active { transform: scale(.97); }
.sts-dd__btn-ghost {
    padding: .8rem 1.5rem; background: #fff; color: #1A3A5C;
    font-size: .9rem; font-weight: 700; border: 1.8px solid #1A3A5C;
    border-radius: 9px; cursor: pointer; font-family: inherit;
    letter-spacing: .5px; text-transform: uppercase; transition: all .15s;
}
.sts-dd__btn-ghost:hover { background: #1A3A5C; color: #fff; }

/* ── Results ── */
.sts-dd__results[hidden] { display: none; }
.sts-dd__results { background: #fff; }

/* Primary Y:M:D banner */
.sts-dd__primary {
    background: #1A3A5C; padding: 2rem 2rem 1.75rem;
    display: flex; align-items: center; justify-content: center;
    gap: 1.2rem; flex-wrap: wrap; text-align: center;
    border-bottom: 3px solid #1D9E75;
}
.sts-dd__primary[hidden] { display: none; }
.sts-dd__primary-unit { display: flex; flex-direction: column; align-items: center; gap: .3rem; }
.sts-dd__primary-num {
    font-size: clamp(48px,10vw,70px); font-weight: 900; color: #fff;
    line-height: 1; letter-spacing: -2px; min-width: 2ch;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 40px rgba(29,158,117,.2);
}
.sts-dd__primary-lbl {
    font-size: .68rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2.5px; color: rgba(255,255,255,.55);
}
.sts-dd__primary-sep {
    font-size: 3rem; font-weight: 200; color: #1D9E75;
    line-height: 1; padding-bottom: 1.5rem; opacity: .7; letter-spacing: -2px;
}

/* Add/sub result banner */
.sts-dd__add-banner {
    background: #1A3A5C; padding: 2rem 2rem 1.75rem;
    text-align: center; border-bottom: 3px solid #1D9E75;
}
.sts-dd__add-banner[hidden] { display: none; }
.sts-dd__add-banner-lbl {
    font-size: .68rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2.5px; color: rgba(255,255,255,.55); display: block; margin-bottom: .6rem;
}
.sts-dd__add-banner-date {
    font-size: clamp(26px,5vw,40px); font-weight: 900; color: #fff;
    display: block; letter-spacing: -.8px; margin-bottom: .4rem; line-height: 1.1;
}
.sts-dd__add-banner-meta { font-size: .95rem; font-weight: 700; color: #1D9E75; letter-spacing: .5px; }

/* Direction bar */
.sts-dd__direction {
    text-align: center; padding: .72rem 1.5rem;
    background: #f0f4f8; border-bottom: 1px solid #dce4ef;
    font-size: .82rem; font-weight: 700; color: #1A3A5C; letter-spacing: .5px;
}

/* Stats grid */
.sts-dd__grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: #dce4ef; }
.sts-dd__card { background: #fff; padding: 1.25rem 1.4rem; display: flex; flex-direction: column; gap: .28rem; }
.sts-dd__card:nth-child(even) { background: #F7F9FC; }
.sts-dd__card-lbl { font-size: .67rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.8px; color: #2D4A63; }
.sts-dd__card-val { font-size: 1.35rem; font-weight: 800; color: #1A3A5C; line-height: 1.15; letter-spacing: -.2px; font-variant-numeric: tabular-nums; }
.sts-dd__card-sub { font-size: .73rem; font-weight: 600; color: #2D4A63; letter-spacing: .2px; }

/* Summary */
.sts-dd__summary {
    font-size: .93rem; font-weight: 600; color: #0f1f30;
    background: #f0f4f8; padding: 1rem 1.75rem; margin: 0;
    border-top: 1px solid #dce4ef; line-height: 1.75; text-align: center; letter-spacing: .1px;
}

/* Actions */
.sts-dd__actions {
    display: flex; gap: .75rem; padding: 1.1rem 1.75rem;
    background: #fff; border-top: 1px solid #dce4ef; flex-wrap: wrap;
}
.sts-dd__action {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .68rem 1.35rem; border: 1.8px solid #1A3A5C;
    border-radius: 8px; background: transparent; color: #1A3A5C;
    font-size: .82rem; font-weight: 700; cursor: pointer;
    transition: all .18s; font-family: inherit; letter-spacing: .5px; text-transform: uppercase;
}
.sts-dd__action svg { width: 15px; height: 15px; }
.sts-dd__action:hover { background: #1A3A5C; color: #fff; }

/* Toast */
.sts-dd__toast {
    margin: .25rem 1.75rem .85rem; padding: .65rem 1rem;
    background: #0f1f30; color: #fff; font-size: .84rem; font-weight: 600;
    border-radius: 8px; text-align: center; font-family: inherit; letter-spacing: .3px;
}
.sts-dd__toast[hidden] { display: none; }

/* ── Responsive ── */
@media (max-width: 520px) {
    .sts-dd__header      { padding: .9rem 1rem; }
    .sts-dd__panel       { padding: .9rem 1rem; }

    /* Presets — tighter */
    .sts-dd__presets     { margin-bottom: .75rem; gap: .3rem; }
    .sts-dd__preset      { padding: 4px 10px; font-size: .68rem; }

    /* Date row — keep 2 columns but make swap button small inline */
    .sts-dd__date-row {
        grid-template-columns: 1fr 36px 1fr;
        gap: .4rem;
        margin-bottom: .75rem;
    }

    /* Swap button — small circle, no margin-top override needed */
    .sts-dd__swap {
        width: 36px; height: 36px;
        margin-top: 22px;
        border-radius: 50%;
    }
    .sts-dd__swap:hover  { transform: none; }
    .sts-dd__swap-icon   { font-size: 16px; }

    /* Reduce field gaps */
    .sts-dd__field       { gap: .25rem; }
    .sts-dd__lbl         { font-size: .65rem; }
    .sts-dd__input,
    .sts-dd__select      { padding: .6rem .75rem; font-size: .88rem; }

    /* Day label */
    .sts-dd__day         { font-size: .7rem; margin-top: .1rem; }

    /* Button row */
    .sts-dd__btn-row     { gap: .5rem; margin-bottom: 0; }
    .sts-dd__btn-primary { padding: .7rem 1rem; font-size: .84rem; }
    .sts-dd__btn-ghost   { padding: .7rem 1rem; font-size: .84rem; }

    /* Results */
    .sts-dd__two-col     { grid-template-columns: 1fr; }
    .sts-dd__grid        { grid-template-columns: 1fr 1fr; }
    .sts-dd__btn-primary,
    .sts-dd__btn-ghost   { width: 100%; text-align: center; }
    .sts-dd__actions     { flex-direction: column; }
    .sts-dd__action      { width: 100%; justify-content: center; }
    .sts-dd__primary     { gap: .5rem; padding: 1.25rem 1rem 1rem; }
    .sts-dd__primary-num { font-size: clamp(2.5rem, 12vw, 4rem); }
    .sts-dd__tab         { font-size: .68rem; letter-spacing: .3px; padding: .75rem .4rem; }
}

/* ── Mobile: stack date inputs vertically ─────────────────────────────────── */
@media (max-width: 600px) {
    .sts-dd__date-row {
        grid-template-columns: 1fr !important;
        gap: .6rem !important;
        margin-bottom: .75rem !important;
    }
    .sts-dd__swap {
        display: none !important;
    }
}