/** Twin Paradox — Mark Remi **/

:root {
    --bg: #f6f7f3;
    --bg-2: #fbfbf8;
    --card: #ffffff;
    --lime: #74ab12;
    --lime-deep: #4d7c0f;
    --lime-tint: #f0f8e0;
    --teal: #0d9488;
    --violet: #7c3aed;
    --ink: #16211b;
    --ink-dim: #5d6b62;
    --ink-faint: #8d988f;
    --line: rgba(22, 33, 27, 0.10);
    --line-hi: rgba(22, 33, 27, 0.20);
    --radius: 22px;
    --shadow: 0 18px 40px -24px rgba(22, 33, 27, 0.35);
    --shadow-lg: 0 30px 70px -34px rgba(22, 33, 27, 0.45);
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    background-color: var(--bg);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-ui);
    color: var(--ink);
    background:
        radial-gradient(1100px 620px at 12% -8%, rgba(163, 230, 53, 0.20), transparent 62%),
        radial-gradient(900px 560px at 92% 2%, rgba(124, 58, 237, 0.12), transparent 64%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%);
    background-attachment: fixed;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ── Ambient orbs ───────────────────────────────────────────── */

.aurora {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.55;
    animation: drift 22s ease-in-out infinite alternate;
}

.orb--lime {
    width: 42vw;
    height: 42vw;
    top: -12vw;
    left: -10vw;
    background: rgba(163, 230, 53, 0.38);
}

.orb--violet {
    width: 38vw;
    height: 38vw;
    top: 24vh;
    right: -14vw;
    background: rgba(167, 139, 250, 0.30);
    animation-duration: 27s;
}

.orb--cyan {
    width: 34vw;
    height: 34vw;
    bottom: -14vw;
    left: 28vw;
    background: rgba(45, 212, 191, 0.24);
    animation-duration: 31s;
}

@keyframes drift {
    to {
        transform: translate3d(4vw, 5vh, 0) scale(1.12);
    }
}

@media (prefers-reduced-motion: reduce) {
    .orb {
        animation: none;
    }
}

/* ── Shell ──────────────────────────────────────────────────── */

.shell {
    position: relative;
    z-index: 1;
    width: min(1080px, 100%);
    margin: 0 auto;
    padding: clamp(40px, 7vw, 88px) clamp(16px, 4vw, 32px) 32px;
    display: flex;
    flex-direction: column;
    gap: clamp(20px, 3.5vw, 34px);
}

/* ── Hero ───────────────────────────────────────────────────── */

.hero {
    text-align: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin: 0 0 clamp(18px, 3vw, 26px);
    padding: 7px 15px 7px 11px;
    font-size: clamp(11px, 1.4vw, 13px);
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--ink-dim);
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid var(--line);
    border-radius: 999px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.pulse {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--lime);
    box-shadow: 0 0 0 0 rgba(116, 171, 18, 0.55);
    animation: pulse 2.4s ease-out infinite;
}

@keyframes pulse {
    70% { box-shadow: 0 0 0 9px rgba(116, 171, 18, 0); }
    100% { box-shadow: 0 0 0 0 rgba(116, 171, 18, 0); }
}

#title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.9rem, 11vw, 7.2rem);
    line-height: 0.92;
    letter-spacing: -0.045em;
    margin: 0;
    background: linear-gradient(96deg, var(--lime-deep) 2%, var(--teal) 46%, var(--violet) 96%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#caption {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(0.95rem, 2.4vw, 1.35rem);
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin: clamp(14px, 2.4vw, 20px) 0 0;
}

.description {
    max-width: 46ch;
    margin: clamp(20px, 3.4vw, 30px) auto 0;
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--ink-dim);
}

.highlight {
    color: var(--ink);
    font-weight: 600;
    background: linear-gradient(transparent 62%, rgba(163, 230, 53, 0.55) 0);
}

/* ── Cards ──────────────────────────────────────────────────── */

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: clamp(22px, 3.6vw, 38px);
    box-shadow: var(--shadow);
}

.step__head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: clamp(20px, 3vw, 28px);
}

.step__num {
    flex: none;
    display: grid;
    place-items: center;
    width: 27px;
    height: 27px;
    border-radius: 50%;
    background: var(--lime-tint);
    border: 1px solid rgba(116, 171, 18, 0.38);
    color: var(--lime-deep);
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
}

.step__title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.05rem, 2.2vw, 1.35rem);
    letter-spacing: -0.015em;
    color: var(--ink);
}

/* ── Pet selector ───────────────────────────────────────────── */

#animals {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(10px, 1.6vw, 16px);
}

.animalButton {
    -webkit-appearance: none;
    appearance: none;
    font: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    min-width: 0;
    overflow: hidden;
    padding: clamp(14px, 2.2vw, 20px) clamp(8px, 1.4vw, 14px) clamp(12px, 1.8vw, 16px);
    background: #fcfdfa;
    border: 1px solid var(--line);
    border-radius: 18px;
    cursor: pointer;
    outline: none;
    transition: transform .22s cubic-bezier(.2, .8, .3, 1), border-color .22s, background-color .22s, box-shadow .22s;
}

.animalButton:hover {
    transform: translateY(-5px);
    border-color: var(--line-hi);
    background: #ffffff;
    box-shadow: var(--shadow);
}

.animalButton:focus-visible {
    border-color: var(--lime);
    box-shadow: 0 0 0 3px rgba(116, 171, 18, 0.25);
}

.animalButton__art {
    width: 100%;
    height: clamp(76px, 10.5vw, 108px);
}

.animalButton img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: grayscale(0.6) brightness(1.02);
    transition: transform .22s cubic-bezier(.2, .8, .3, 1), filter .22s, opacity .22s;
}

.animalButton:hover img {
    transform: scale(1.05);
}

.animalButton__name {
    font-size: clamp(12px, 1.5vw, 14px);
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--ink-faint);
    transition: color .22s;
}

/* States driven by js/main.js */

.animalIconActive {
    opacity: 1;
    filter: none !important;
}

.animalIconInactive {
    opacity: 0.55;
}

.animalButton:has(.animalIconActive) {
    background: var(--lime-tint);
    border-color: rgba(116, 171, 18, 0.55);
    box-shadow: 0 14px 32px -20px rgba(116, 171, 18, 0.85);
}

.animalButton:has(.animalIconActive) .animalButton__name {
    color: var(--lime-deep);
    font-weight: 600;
}

/* ── Fields ─────────────────────────────────────────────────── */

.calendars {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(14px, 2.4vw, 22px);
}

.calendar_field {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.calendar_field label {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--ink-dim);
    margin: 0 0 9px 2px;
}

.field {
    position: relative;
    display: flex;
    align-items: center;
}

.field__icon {
    position: absolute;
    left: 16px;
    display: grid;
    place-items: center;
    color: var(--ink-faint);
    font-size: 15px;
    pointer-events: none;
    transition: color .2s;
}

.datePicker {
    width: 100%;
    font: inherit;
    font-size: clamp(0.95rem, 1.7vw, 1.02rem);
    color: var(--ink);
    background: #fbfcf8;
    border: 1px solid var(--line-hi);
    border-radius: 14px;
    padding: 15px 16px 15px 45px;
    cursor: pointer;
    outline: none;
    transition: border-color .2s, box-shadow .2s, background-color .2s;
}

.datePicker::placeholder {
    color: var(--ink-faint);
}

.datePicker:hover {
    background: #ffffff;
}

.datePicker:focus,
.datePicker.picker__input--active {
    background: #ffffff;
    border-color: var(--lime);
    box-shadow: 0 0 0 3px rgba(116, 171, 18, 0.18);
}

.field:focus-within .field__icon {
    color: var(--lime-deep);
}

/* ── Privacy note ───────────────────────────────────────────── */

.privacy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    flex-wrap: wrap;
    align-self: center;
    max-width: 100%;
    margin: 0;
    padding: 11px 22px;
    font-size: 13px;
    line-height: 1.5;
    text-align: center;
    color: var(--ink-dim);
    background: var(--lime-tint);
    border: 1px solid rgba(116, 171, 18, 0.28);
    border-radius: 999px;
}

.privacy .fa-lock {
    color: var(--lime-deep);
    font-size: 12px;
}

/* ── Confirm row ────────────────────────────────────────────── */

.ok_dog, .ok_cat, .ok_rabbit, .ok_horse {
    margin-top: clamp(20px, 3vw, 28px);
    padding-top: clamp(20px, 3vw, 26px);
    border-top: 1px dashed var(--line-hi);
    text-align: center;
}

.confirm__hint {
    margin: 0 0 14px;
    font-size: 13px;
    color: var(--ink-dim);
}

.confirm__row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.btn {
    -webkit-appearance: none;
    appearance: none;
    font: inherit;
    font-size: clamp(0.88rem, 1.6vw, 0.95rem);
    font-weight: 500;
    color: var(--ink);
    background: #ffffff;
    border: 1px solid var(--line-hi);
    border-radius: 999px;
    padding: 12px 22px;
    cursor: pointer;
    outline: none;
    transition: transform .18s cubic-bezier(.2, .8, .3, 1), background-color .18s, border-color .18s, color .18s, box-shadow .18s;
}

.btn:hover {
    transform: translateY(-2px);
    background: var(--lime-tint);
    border-color: rgba(116, 171, 18, 0.55);
    color: var(--lime-deep);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

.btn:focus-visible {
    border-color: var(--lime);
    box-shadow: 0 0 0 3px rgba(116, 171, 18, 0.25);
}

.btn--go {
    background: linear-gradient(96deg, var(--lime), var(--teal));
    border-color: transparent;
    color: #ffffff;
    font-weight: 600;
    padding-inline: 30px;
}

.btn--go:hover {
    background: linear-gradient(96deg, var(--lime-deep), var(--teal));
    color: #ffffff;
}

.btn i {
    margin-left: 7px;
    font-size: 0.82em;
}

/* ── Result ─────────────────────────────────────────────────── */

.card--result {
    text-align: center;
    background:
        radial-gradient(120% 150% at 50% 0%, rgba(163, 230, 53, 0.16), transparent 64%),
        var(--card);
    border-color: rgba(116, 171, 18, 0.32);
}

.result__label {
    margin: 0 0 12px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--ink-faint);
}

#result {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.7rem, 6.4vw, 3.5rem);
    line-height: 1.08;
    letter-spacing: -0.035em;
    color: var(--ink);
}

#result .fa-check {
    color: var(--lime-deep) !important;
    font-size: 0.62em;
    margin-left: 8px;
}

#age {
    margin-top: 12px;
    font-size: clamp(0.92rem, 1.9vw, 1.08rem);
    color: var(--ink-dim);
}

/* ── Chart ──────────────────────────────────────────────────── */

#chartContainer {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: clamp(22px, 3.6vw, 34px);
    box-shadow: var(--shadow);
}

.chart__head {
    margin-bottom: 20px;
}

.chart__title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    letter-spacing: -0.015em;
}

.chart__sub {
    margin: 5px 0 0;
    font-size: 13px;
    color: var(--ink-faint);
}

.chart__canvas {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
}

/* ── Counter ────────────────────────────────────────────────── */

#birthdays {
    margin: clamp(6px, 1.6vw, 14px) auto 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 9px;
    align-self: center;
    padding: 13px 26px;
    font-size: clamp(0.86rem, 1.7vw, 0.98rem);
    color: var(--ink-dim);
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--line);
    border-radius: 999px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#birthdays .fa-birthday-cake {
    color: var(--violet);
}

#visitors {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.12em;
    color: var(--lime-deep);
}

/* ── Footer ─────────────────────────────────────────────────── */

.footer,
.footerModified {
    position: relative;
    z-index: 1;
    padding: 30px 20px 38px;
    text-align: center;
    font-size: 13px;
    color: var(--ink-faint);
    background: none;
    border: none;
}

.footer p,
.footerModified p {
    margin: 0;
}

.footer a,
.footerModified a {
    color: var(--ink-dim);
    text-decoration: none;
    border-bottom: 1px solid var(--line-hi);
    transition: color .2s, border-color .2s;
}

.footer a:hover,
.footerModified a:hover {
    color: var(--lime-deep);
    border-color: var(--lime-deep);
}

/* ── Date picker popup ──────────────────────────────────────── */

.picker__frame {
    max-width: 340px;
}

.picker__box {
    background: #ffffff;
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow-lg);
    padding: 8px 16px 4px;
}

.picker__header {
    color: var(--ink);
}

.picker__month,
.picker__year {
    font-family: var(--font-display);
}

.picker__year {
    color: var(--ink-faint);
}

.picker__select--month,
.picker__select--year {
    font: inherit;
    font-size: 14px;
    color: var(--ink);
    background: #fbfcf8;
    border: 1px solid var(--line-hi);
    border-radius: 9px;
    height: 2.3em;
    outline: none;
}

.picker__select--month:focus,
.picker__select--year:focus {
    border-color: var(--lime);
}

.picker__nav--prev:before,
.picker__nav--next:before {
    border-right-color: var(--ink-dim);
}

.picker__nav--next:before {
    border-left-color: var(--ink-dim);
}

.picker__nav--prev:hover,
.picker__nav--next:hover {
    background: var(--lime-tint);
    border-radius: 8px;
}

.picker__weekday {
    color: var(--ink-faint);
}

.picker__day {
    border-radius: 9px;
    padding: 0.42em 0;
    font-weight: 400;
}

.picker__day--outfocus {
    color: #c6cdc6;
}

.picker__day--infocus:hover,
.picker__day--outfocus:hover {
    background: var(--lime-tint);
    color: var(--ink);
}

.picker__day--today:before {
    border-top-color: var(--lime);
}

.picker__day--highlighted {
    border-color: rgba(116, 171, 18, 0.55);
}

.picker__day--highlighted:hover,
.picker--focused .picker__day--highlighted {
    background: var(--lime-tint);
    color: var(--ink);
}

.picker__day--selected,
.picker__day--selected:hover,
.picker--focused .picker__day--selected {
    background: var(--lime);
    color: #ffffff;
    font-weight: 600;
}

.picker__footer {
    background: none;
}

.picker__button--today,
.picker__button--clear,
.picker__button--close {
    background: none;
    border: none;
    color: var(--ink-dim);
    font-weight: 500;
}

.picker__button--today:hover,
.picker__button--clear:hover,
.picker__button--close:hover {
    background: var(--lime-tint);
    color: var(--ink);
    border-radius: 8px;
}

/* ── Responsive ─────────────────────────────────────────────── */

@media (max-width: 720px) {
    #animals {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .calendars {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 420px) {
    .confirm__row .btn {
        width: 100%;
    }
}