[hidden] {
    display: none !important
}

:root {
    --ink: #171816;
    --paper: #f3f0e8;
    --card: #fffefa;
    --muted: #706d65;
    --line: #d7d1c5;
    --orange: #e94f24;
    --yellow: #f4c84b;
    --green: #17493d;
    --shadow: 0 24px 70px #231e141f;
    --blue: #043be8;
    --red: #f60000;
}

    :root[data-theme=dark] {
        --ink: #f3f0e8;
        --paper: #171916;
        --card: #24261f;
        --muted: #aaa79d;
        --line: #404139;
        --green: #78cdb2;
        --shadow: 0 24px 70px #0008
        
    }

* {
    box-sizing: border-box
}


.logo-link {
    display: inline-block;
    text-decoration: none;
}

.logo-img {
    height: 70px; /* Set your desired height */
    width: auto; /* Keeps the aspect ratio perfectly intact */
    display: block;
}








body {
    margin: 0;
    background: var(--paper);
    color: var(--blue);
    font-family: Arial,sans-serif
}

main {
    min-height: 100vh;
    background: none; 
   
}

button {
    color: inherit
}

header {
    height: 82px;
    padding: 0 max(28px,5vw);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--red)
}

.brand {
    display: flex;
    align-items: center;
    gap: 13px
}

    .brand i {
        width: 42px;
        height: 42px;
        display: grid;
        place-items: center;
        border: 2px solid;
        font: italic 800 26px Georgia;
        box-shadow: 4px 4px var(--red);
        transform: rotate(-4deg)
    }

    .brand b {
        display: block;
        letter-spacing: .14em;
        font-size: 14px
    }

    .brand small {
        display: block;
        color: var(--muted);
        font-size: 9px;
        letter-spacing: .22em;
        margin-top: 3px
    }

.tools {
    display: flex;
    gap: 9px
}

    .tools label {
        height: 42px;
        width: 260px;
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 0 14px;
        background: var(--card);
        border: 1px solid var(--line)
    }

    .tools input {
        border: 0;
        outline: 0;
        width: 100%;
        background: transparent;
        color: var(--red)
    }

    .tools button {
        width: 42px;
        border: 1px solid var(--line);
        background: var(--card);
        cursor: pointer
    }

.hero {
    max-width: 1180px;
    margin: auto;
    padding: 68px 28px 50px;
    display: grid;
    grid-template-columns: 1.3fr .7fr;
    gap: 70px;
    align-items: end
}

.eyebrow {
    color: var(--red);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: .23em
}

.hero h1 {
    font: 700 clamp(46px,6.5vw,82px)/.92 Georgia;
    margin: 17px 0 24px;
    letter-spacing: -.055em
}

    .hero h1 em {
        color: var(--blue);
        font-weight: 400
    }

.hero > div > p {
    font: 18px/1.6 Georgia;
    color: var(--red);
    max-width: 590px
}

.hero aside {
    border-left: 1px solid var(--line);
    padding-left: 34px;
    display: flex;
    gap: 22px;
    align-items: center
}

.ring {
    --p: 0deg;
    width: 112px;
    height: 112px;
    border-radius: 50%;
    display: grid;
    place-content: center;
    text-align: center;
    background: radial-gradient(circle,var(--paper) 0 42%,transparent 43%),conic-gradient(var(--red) var(--p),var(--line) 0)
}

    .ring strong {
        font: 700 27px Georgia
    }

    .ring small {
        font-size: 8px;
        letter-spacing: .16em
    }

.hero aside p {
    font-size: 12px;
    color: var(--muted);
    margin: 6px 0 10px
}

.hero aside button {
    border: 0;
    padding: 0;
    background: none;
    color: var(--blue);
    text-decoration: underline;
    font-size: 11px;
    cursor: pointer
}

nav {
    max-width: 1190px;
    margin: auto;
    padding: 0 28px 22px;
    display: flex;
    gap: 8px;
    overflow: auto;
    scrollbar-width: auto;
}

    nav button {
        white-space: nowrap;
        border: 1px solid var(--line);
        background: transparent;
        color: var(--blue);
        padding: 10px 13px;
        font-size: 11px;
        cursor: pointer
    }

    nav span {
        color: var(--red);
        font-weight: 800;
        margin-right: 7px
    }

    nav button.active {
        background: var(--card);
        color: var(--red);
        border-color: var(--red);
    }

.study {
    max-width: 920px;
    margin: auto;
    padding: 38px 28px 70px
}

.studyhead {
    display: flex;
    justify-content: space-between;
    align-items: end;
    margin-bottom: 20px
}

    .studyhead h2 {
        font: 700 28px Georgia;
        margin: 7px 0 0
    }

    .studyhead > button {
        border: 1px solid var(--line);
        background: var(--card);
        padding: 11px 15px;
        font-size: 12px;
        cursor: pointer
    }

.flash {
    width: 100%;
    height: 420px;
    display: block;
    border: 0;
    background: transparent;
    perspective: 1200px;
    position: relative;
    text-align: left;
    cursor: pointer
}

.face {
    position: absolute;
    inset: 0;
    padding: 34px 46px;
    display: flex;
    flex-direction: column;
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    backface-visibility: hidden;
    transition: transform .55s
}

    .face:before {
        content: "";
        position: absolute;
        inset: 0 auto 0 0;
        width: 7px;
        background: var(--red)
    }

.back {
    transform: rotateY(180deg);
    background: #022696;
    color: white
}

    .back:before {
        background: var(--red)
    }

.flipped .front {
    transform: rotateY(-180deg)
}

.flipped .back {
    transform: rotateY(0)
}

.meta {
    display: flex;
    gap: 9px;
    font-size: 9px;
    letter-spacing: .15em
}

    .meta span {
        border: 1px solid;
        padding: 6px 8px;
        opacity: .7
    }

.face > small {
    margin: auto 0 18px;
    color: var(--red);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: .22em
}

.back > small {
    color: var(--red)
}

.face h3 {
    font: 600 clamp(29px,5vw,49px)/1.18 Georgia;
    margin: 0;
    max-width: 760px
}

.face > p {
    margin-top: auto;
    color: var(--muted);
    font-size: 11px
}

.back > p {
    color: #d5ded9
}

.controls {
    display: grid;
    grid-template-columns: 1fr auto auto 1fr;
    gap: 18px;
    align-items: center;
    margin-top: 24px
}

    .controls button {
        height: 44px;
        border: 0;
        background: transparent;
        cursor: pointer
    }

        .controls button:first-child {
            text-align: left
        }

        .controls button:last-child {
            text-align: right
        }

    .controls > div {
        text-align: center;
        color: var(--red);
        font: 12px Georgia
    }

        .controls > div b {
            color: var(--ink);
            font-size: 22px
        }

    .controls i {
        display: block;
        width: 90px;
        height: 2px;
        background: var(--line);
        margin-top: 6px
    }

    .controls u {
        display: block;
        height: 100%;
        background: var(--red)
    }

    .controls button:nth-of-type(2) {
        border: 1px solid var(--red);
        color: var(--red);
        padding: 0 17px;
        font-size: 11px;
        font-weight: 800
    }

    .controls button.known {
        background: var(--blue);
        color: white
    }

.keys {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 28px;
    color: var(--muted);
    font-size: 10px
}

    .keys span {
        display: flex;
        gap: 5px;
        align-items: center
    }

kbd {
    border: 1px solid var(--line);
    background: var(--card);
    padding: 3px 6px;
    box-shadow: 0 2px var(--line)
}

.empty {
    height: 300px;
    border: 1px solid var(--line);
    display: grid;
    place-content: center;
    text-align: center
}

    .empty h3 {
        font: 30px Georgia;
        margin: 0
    }

    .empty p {
        color: var(--muted)
    }

footer {
    border-top: 1px solid var(--red);
    padding: 28px max(28px,5vw);
    display: flex;
    gap: 15px;
    color: var(--blue);
    font-size: 11px
}

    footer b {
        color: var(--red);
        letter-spacing: .14em
    }

    footer p {
        margin: 0 0 0 auto
    }

@media(max-width:760px) {
    header {
        height: 70px
    }

    .tools label {
        width: 42px;
        padding: 0 12px
    }

    .tools input {
        display: none
    }

    .hero {
        grid-template-columns: 1fr;
        padding-top: 45px;
        gap: 28px
    }

        .hero h1 {
            font-size: 50px
        }

        .hero aside {
            border: 0;
            border-top: 1px solid var(--line);
            padding: 25px 0 0
        }

    .study {
        padding-inline: 18px
    }

    .flash {
        height: 390px
    }

    .face {
        padding: 27px
    }

    .controls {
        grid-template-columns: 1fr auto 1fr
    }

        .controls button:nth-of-type(2) {
            grid-row: 2;
            grid-column: 1/4
        }

    .keys {
        display: none
    }

    .studyhead h2 {
        font-size: 21px
    }

    .brand small {
        display: none
    }

    footer {
        display: block
    }

        footer p {
            margin-top: 10px
        }
}

@media(prefers-reduced-motion:reduce) {
    .face {
        transition: none
    }
}