/* Borrowed verbatim from the agency design system to keep Bluff a sibling. */
:root {
    --bg: #f5f0e8;
    --bg-alt: #ffffff;
    --ink: #1a1a1a;
    --ink-light: #6b6560;
    --cream: #f5f0e8;
    --card-bg: #ffffff;
    --card-border: rgba(26,26,26,.08);
    --nav-bg: rgba(245,240,232,.85);
    --nav-border: rgba(26,26,26,.06);
    --orange: #e8572a;
    --orange-light: #ff7a52;
    --teal: #1a8a7d;
    --teal-light: #2bc4b0;
    --lemon: #e8d44a;
    --blue: #3d5afe;
    --shadow-color: rgba(26,26,26,.08);
    --shadow-strong: rgba(26,26,26,.14);
    --pill-bg: rgba(26,26,26,.05);
    --tag-bg: rgba(26,26,26,.06);
    --logo-border: rgba(26,26,26,.08);
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Outfit', system-ui, sans-serif;
    --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", monospace;

    /* Tile palette — agency colours, NOT Wordle green/yellow.
       The reskin is intentional: the lab feels its own thing. */
    --tile-correct: var(--orange);     /* "was-green" */
    --tile-present: var(--lemon);      /* "was-yellow" */
    --tile-absent:  #b6ada4;           /* "was-gray", warm to fit the cream bg */
    --tile-empty-border: rgba(26,26,26,.18);
    --tile-filled-border: rgba(26,26,26,.55);
    --tile-text-on-color: #1a1a1a;
    --key-bg: rgba(26,26,26,.07);
    --key-bg-hover: rgba(26,26,26,.12);
    --key-text: var(--ink);
}

[data-theme="dark"] {
    --bg: #121214;
    --bg-alt: #1a1a1e;
    --ink: #e8e4dc;
    --ink-light: #9a958f;
    --cream: #e8e4dc;
    --card-bg: #1e1e22;
    --card-border: rgba(255,255,255,.07);
    --nav-bg: rgba(18,18,20,.88);
    --nav-border: rgba(255,255,255,.06);
    --shadow-color: rgba(0,0,0,.35);
    --shadow-strong: rgba(0,0,0,.5);
    --pill-bg: rgba(255,255,255,.06);
    --tag-bg: rgba(255,255,255,.06);
    --logo-border: rgba(255,255,255,.1);

    --tile-absent:  #4a4641;
    --tile-empty-border: rgba(255,255,255,.18);
    --tile-filled-border: rgba(255,255,255,.55);
    --tile-text-on-color: #1a1a1a;
    --key-bg: rgba(255,255,255,.08);
    --key-bg-hover: rgba(255,255,255,.14);
    --key-text: var(--ink);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
::selection { background: var(--orange); color: #fff; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--ink);
    overflow-x: hidden;
    /* dvh accounts for mobile URL-bar collapse; vh is a fallback. The point
       is that the entire game (nav + hero + board + keyboard + footer) fits
       within one viewport on a typical phone — no scrolling for play. */
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    transition: background .4s, color .4s;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
main {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}
a { color: inherit; }
button { font-family: inherit; }

/* ---------- Nav (mirrors fun.thedeveloperguys.com) ---------- */

nav {
    position: sticky;
    top: 0;
    z-index: 99;
    padding: 1rem 2.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1.5px solid var(--nav-border);
    transition: background .4s, border-color .4s;
}
.nav-logo {
    display: inline-flex;
    align-items: center;
    gap: .65rem;
    text-decoration: none;
    color: var(--ink);
    user-select: none;
    transition: transform .2s;
}
.nav-logo:active { transform: scale(.96); }

/* SVG mark + italic name — matches the Plume sibling lab. */
.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1.5px solid var(--logo-border);
    background: var(--card-bg);
    color: var(--orange);
    transition: transform .3s cubic-bezier(.34,1.56,.64,1), border-color .3s;
}
.logo-mark svg { width: 19px; height: 19px; }
.nav-logo:hover .logo-mark { transform: rotate(-6deg) scale(1.05); border-color: var(--orange); }

.nav-name {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.45rem;
    letter-spacing: -.5px;
}

.nav-right { display: flex; align-items: center; gap: .6rem; }
.nav-back {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    font-size: .82rem;
    font-weight: 500;
    color: var(--ink-light);
    text-decoration: none;
    padding: .5rem .9rem;
    border-radius: 100px;
    transition: color .2s, background .2s;
}
.nav-back:hover { color: var(--ink); background: var(--pill-bg); }
.nav-back svg { transition: transform .2s; }
.nav-back:hover svg { transform: translateX(-3px); }

.icon-btn {
    background: none;
    border: 1.5px solid var(--card-border);
    width: 40px; height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--ink);
    transition: all .3s cubic-bezier(.34,1.56,.64,1);
    flex-shrink: 0;
}
.icon-btn:hover { border-color: var(--orange); color: var(--orange); transform: scale(1.08); }
.icon-btn svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform .4s cubic-bezier(.34,1.56,.64,1); }
.icon-btn:hover svg { transform: rotate(15deg); }
.icon-btn .icon-moon { display: none; }
[data-theme="dark"] .icon-btn .icon-sun { display: none; }
[data-theme="dark"] .icon-btn .icon-moon { display: block; }

/* ---------- Hero ---------- */

.hero {
    text-align: center;
    padding: 1rem 1.5rem .4rem;
    max-width: 760px;
    margin: 0 auto;
    flex: 0 0 auto;
}
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: .7rem;
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--orange);
    margin-bottom: .5rem;
}
.eyebrow-line { display: block; width: 28px; height: 1.5px; background: currentColor; opacity: .45; }

.hero h1 {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.7rem, 3.4vw, 2.6rem);
    line-height: 1;
    letter-spacing: -.8px;
    margin-bottom: .4rem;
}
.hero h1 em { font-style: italic; color: var(--orange); }

.hero-sub {
    max-width: 520px;
    margin: 0 auto;
    color: var(--ink-light);
    font-size: .85rem;
    line-height: 1.45;
}
.hero-sub em { font-style: italic; color: var(--ink); }

/* ---------- Board ---------- */

.board-wrap {
    max-width: 700px;
    width: 100%;
    margin: 0 auto;
    padding: .4rem 1rem .8rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    flex: 1 1 auto;
    min-height: 0;
    justify-content: center;
}

/* Board width is the smaller of:
   - a hard cap (large monitors don't need an absurd board),
   - 88% of the wrap width,
   - what's left of the viewport height after nav + hero + keyboard +
     footer claim their share (~460px), converted to width via the
     5/6 aspect ratio.
   This guarantees the keyboard's bottom row stays above the fold. */
.board {
    display: grid;
    grid-template-rows: repeat(6, 1fr);
    gap: 8px;
    padding: 6px;
    width: min(520px, 88%, calc((100vh - 440px) * 5 / 6));
    aspect-ratio: 5 / 6;
    flex: 0 0 auto;
}

.row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.tile {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--tile-empty-border);
    border-radius: 10px;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.6rem, 4vw, 2.6rem);
    text-transform: uppercase;
    user-select: none;
    background: transparent;
    color: var(--ink);
    transition: transform .15s, border-color .15s;
    aspect-ratio: 1 / 1;
}
.tile.filled {
    border-color: var(--tile-filled-border);
}
/* Pop is only on the freshly-typed tile — applied imperatively. Decoupling
   from .filled stops every re-render from popping every already-submitted
   tile. */
.tile.pop { animation: tile-pop .12s ease; }
@keyframes tile-pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.06); }
    100% { transform: scale(1); }
}

/* The flip-reveal animation. Delay is set via inline style per-column. */
.tile.revealed {
    animation: tile-flip .55s ease forwards;
    transform-style: preserve-3d;
}
@keyframes tile-flip {
    0%   { transform: rotateX(0); }
    49%  { transform: rotateX(90deg); border-color: var(--tile-filled-border); background: transparent; color: var(--ink); }
    50%  { transform: rotateX(90deg); }
    100% { transform: rotateX(0); }
}

.tile.state-correct, .tile.state-present, .tile.state-absent {
    border-color: transparent;
    color: var(--tile-text-on-color);
}
.tile.state-correct { background: var(--tile-correct); color: #fff; }
.tile.state-present { background: var(--tile-present); }
.tile.state-absent  { background: var(--tile-absent); color: #fff; }

[data-theme="dark"] .tile.state-present { color: #1a1a1a; }
[data-theme="dark"] .tile.state-absent { color: #e8e4dc; }

/* Mini variant (used in how-to) */
.tile.mini {
    width: 32px;
    height: 32px;
    aspect-ratio: 1 / 1;
    font-size: 1rem;
    border-radius: 6px;
}

/* Shake when the guess is invalid */
.row.shake { animation: shake .45s; }
@keyframes shake {
    10%, 90% { transform: translateX(-1px); }
    20%, 80% { transform: translateX(2px); }
    30%, 50%, 70% { transform: translateX(-4px); }
    40%, 60% { transform: translateX(4px); }
}

/* Bounce when it's a winning row */
.row.bounce .tile { animation: bounce .55s ease; }
.row.bounce .tile:nth-child(1) { animation-delay: 0s; }
.row.bounce .tile:nth-child(2) { animation-delay: .08s; }
.row.bounce .tile:nth-child(3) { animation-delay: .16s; }
.row.bounce .tile:nth-child(4) { animation-delay: .24s; }
.row.bounce .tile:nth-child(5) { animation-delay: .32s; }
@keyframes bounce {
    0%,20% { transform: translateY(0); }
    40%    { transform: translateY(-22px); }
    50%    { transform: translateY(4px); }
    60%    { transform: translateY(-10px); }
    80%    { transform: translateY(2px); }
    100%   { transform: translateY(0); }
}

/* ---------- Status line ---------- */

.status-line {
    min-height: 1.2em;
    font-size: .85rem;
    color: var(--ink-light);
    text-align: center;
    font-style: italic;
    font-family: var(--font-display);
    font-size: 1rem;
}

/* ---------- Keyboard ---------- */

.keyboard {
    width: 100%;
    max-width: 580px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 0 4px;
    margin-top: .25rem;
    flex: 0 0 auto;
}
.keyboard.locked .key {
    opacity: .55;
    cursor: default;
    pointer-events: none;
}
.kb-row {
    display: flex;
    gap: 5px;
    justify-content: center;
}
.key {
    flex: 1 1 auto;
    min-width: 0;
    height: 50px;
    border-radius: 8px;
    background: var(--key-bg);
    color: var(--key-text);
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    transition: background .15s, transform .08s;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.key:hover { background: var(--key-bg-hover); }
.key:active { transform: scale(.94); }
.key.wide { flex: 1.5 1 auto; font-size: .72rem; letter-spacing: .8px; font-weight: 700; }
.key.state-correct { background: var(--tile-correct); color: #fff; }
.key.state-present { background: var(--tile-present); color: #1a1a1a; }
.key.state-absent  { background: var(--tile-absent); color: #fff; }
[data-theme="dark"] .key.state-absent { color: #e8e4dc; }

/* Spacer keys on the bottom row to align ENTER/⌫ */
.key-spacer { flex: .5 1 auto; visibility: hidden; }

/* ---------- Modal ---------- */

.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.modal[hidden] { display: none; }
.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(10, 9, 8, .55);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    animation: fade-in .25s ease;
}
.modal-card {
    position: relative;
    z-index: 1;
    background: var(--card-bg);
    border: 1.5px solid var(--card-border);
    border-radius: 22px;
    padding: 2rem 1.8rem;
    max-width: 440px;
    width: 100%;
    box-shadow: 0 30px 80px var(--shadow-strong);
    animation: pop-in .35s cubic-bezier(.16,1,.3,1);
}
.modal-close {
    position: absolute;
    top: .8rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.6rem;
    line-height: 1;
    color: var(--ink-light);
    cursor: pointer;
    transition: color .15s, transform .15s;
}
.modal-close:hover { color: var(--orange); transform: rotate(90deg); }

.modal-card h2 {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.85rem;
    line-height: 1.05;
    letter-spacing: -.5px;
    margin-bottom: .8rem;
}
.modal-card h2 em { font-style: italic; color: var(--orange); }
.modal-card p {
    color: var(--ink-light);
    font-size: .92rem;
    line-height: 1.6;
    margin-bottom: .8rem;
}
.modal-card p em { font-style: italic; color: var(--ink); }
.how-tiles {
    display: flex;
    align-items: center;
    gap: .7rem;
    margin-bottom: .55rem;
}
.tile-label { font-size: .9rem; color: var(--ink-light); }
.how-twist { margin-top: 1rem; padding-top: 1rem; border-top: 1px dashed var(--card-border); }
.how-foot { font-size: .82rem; opacity: .8; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in {
    from { opacity: 0; transform: translateY(20px) scale(.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* End-of-game card pieces */
.end-answer {
    text-align: center;
    margin-bottom: 1.2rem !important;
    color: var(--ink) !important;
    font-size: 1rem !important;
}
.end-answer strong {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: 1.5rem;
    color: var(--orange);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0 .25rem;
}
.reveal-card {
    background: var(--bg);
    border: 1.5px solid var(--card-border);
    border-radius: 14px;
    padding: 1.1rem 1.2rem;
    margin-bottom: 1.4rem;
}
.reveal-eyebrow {
    font-size: .65rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--orange);
    margin-bottom: .45rem;
}
.reveal-name {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: 1.5rem;
    margin-bottom: .35rem;
}
.reveal-desc {
    color: var(--ink-light);
    font-size: .88rem;
    line-height: 1.55;
    margin: 0;
}
.end-actions {
    display: flex;
    gap: .6rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.next-puzzle {
    text-align: center;
    font-size: .8rem !important;
    color: var(--ink-light);
    margin: 0 !important;
    font-family: var(--font-mono);
    letter-spacing: .04em;
}

/* ---------- Buttons (agency style) ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: .88rem;
    padding: .75rem 1.4rem;
    border-radius: 100px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all .3s cubic-bezier(.34,1.56,.64,1);
    color: inherit;
}
.btn-fill { background: var(--ink); color: var(--cream); }
.btn-fill:hover { background: var(--orange); color: #fff; transform: translateY(-2px) scale(1.04); box-shadow: 0 12px 30px rgba(232,87,42,.3); }
.btn-outline { background: transparent; border: 1.5px solid var(--card-border); color: var(--ink); }
.btn-outline:hover { border-color: var(--ink); transform: scale(1.03); }

/* ---------- Toast ---------- */

.toast {
    position: fixed;
    top: 5.5rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--ink);
    color: var(--cream);
    padding: .75rem 1.2rem;
    border-radius: 100px;
    font-size: .85rem;
    font-weight: 600;
    box-shadow: 0 12px 30px var(--shadow-strong);
    z-index: 250;
    animation: toast-in .25s ease;
}
.toast[hidden] { display: none; }
@keyframes toast-in {
    from { opacity: 0; transform: translate(-50%, -8px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- Footer ---------- */

footer {
    border-top: 1px solid var(--card-border);
    padding: .8rem 2.5rem;
    transition: border-color .4s;
    flex: 0 0 auto;
}
.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: .82rem;
    color: var(--ink-light);
}
.footer-inner a {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px dotted var(--ink-light);
    transition: color .2s, border-color .2s;
}
.footer-inner a:hover { color: var(--orange); border-bottom-color: var(--orange); }
.footer-links { display: flex; gap: 1.5rem; }

/* ---------- Responsive ---------- */

@media (max-width: 540px) {
    nav { padding: .55rem .9rem; }
    .nav-back { display: none; }
    .logo-mark { width: 32px; height: 32px; border-radius: 8px; }
    .logo-mark svg { width: 16px; height: 16px; }
    .nav-name { font-size: 1.25rem; }
    .icon-btn { width: 34px; height: 34px; }
    .icon-btn svg { width: 15px; height: 15px; }

    .hero { padding: .9rem .9rem .4rem; }
    .hero-eyebrow { font-size: .6rem; letter-spacing: 2px; margin-bottom: .35rem; }
    .hero h1 { font-size: clamp(1.5rem, 6vw, 2rem); margin-bottom: .35rem; letter-spacing: -.5px; }
    /* Subtitle eats too much vertical space on phones — the rules of the game
       are in the how-to modal, which auto-pops on first visit. Hide here. */
    .hero-sub { display: none; }

    .board-wrap { padding: .25rem .5rem .5rem; gap: .35rem; }
    .board { max-width: 300px; gap: 4px; padding: 4px; }
    .row { gap: 4px; }
    .tile { font-size: 1.4rem; border-radius: 7px; border-width: 1.5px; }

    .status-line { font-size: .82rem; min-height: 1em; }

    .keyboard { gap: 4px; padding: 0 2px; }
    .kb-row { gap: 4px; }
    .key { height: 42px; font-size: .88rem; border-radius: 6px; }
    .key.wide { font-size: .62rem; }

    .modal { padding: .8rem; }
    .modal-card { padding: 1.4rem 1.1rem; border-radius: 18px; }
    .modal-card h2 { font-size: 1.4rem; }
    .modal-card p { font-size: .85rem; }

    footer { padding: .65rem 1rem; }
    .footer-inner { font-size: .72rem; gap: .4rem; }
    .footer-links { gap: .9rem; }
}

/* Very short screens (landscape phones, low laptops): compress further. */
@media (max-height: 720px) {
    .hero { padding-top: .8rem; padding-bottom: .3rem; }
    .hero-eyebrow { margin-bottom: .35rem; }
    .hero h1 { font-size: 1.6rem; margin-bottom: .35rem; }
    .hero-sub { font-size: .82rem; line-height: 1.35; }
    .board { max-width: 280px; }
    .key { height: 40px; }
}