:root {
    --bg: #fffcf6;
    --paper: #fff4e8;
    --card: #ffffff;

    --text: #002f33;
    --muted: #4d5562;
    --line: #fce9da;

    --accent: #007680;
    --accent-hover: #005e66;
    --accent-strong: #00464c;

    --nature: #134c37;
    --warm: #b15d1c;

    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;

    --shadow-soft: 0 10px 30px rgba(0, 47, 51, 0.08);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}

body.is-leaving .language-page {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.language-title {
    min-height: 2.2em;
}

#animated-language-title {
    display: inline-block;
    transition:
        opacity 1s ease,
        transform 1s ease;
}

#animated-language-title.is-changing {
    opacity: 0;
    transform: translateY(8px);
}

.language-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 0px;
    position: relative;
    z-index: 1;
}

.language-card {
    width: 100%;
    max-width: 620px;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-soft);
    text-align: center;
    position: relative;
}

.language-card>*:not(.deco) {
    position: relative;
    z-index: 1;
}

.language-kicker {
    margin: 0 0 10px;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.language-card h1 {
    margin: 0;
    font-family: Georgia, serif;
    font-size: clamp(2.2rem, 8vw, 3.6rem);
    line-height: 1;
}

.language-card p {
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.5;
}

.language-actions {
    display: grid;
    gap: 12px;
    margin-top: 28px;
}

.language-actions button {
    border: none;
    border-radius: 999px;
    padding: 16px 20px;
    background: var(--accent);
    color: var(--card);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition:
        background 0.2s ease,
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.language-actions button:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.language-actions button:active {
    background: var(--accent-strong);
    transform: translateY(0);
}

.language-actions button:focus-visible {
    outline: 2px solid var(--accent-strong);
    outline-offset: 3px;
}

.language-logo {
    width: min(300px, 85%);
    height: auto;
    margin: 0 auto 24px;
    display: block;
}

.deco {
    position: absolute;
    pointer-events: none;
    z-index: 0;
    opacity: 0.9;

    -webkit-mask-image: linear-gradient(to bottom,
            black 0%,
            black 95%,
            transparent 100%);
    mask-image: linear-gradient(to bottom,
            black 0%,
            black 95%,
            transparent 100%);

    -webkit-mask-size: 100% 100%;
    mask-size: 100% 100%;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.06));
}

.deco-left {
    top: -25px;
    left: -1px;
    width: 250px;
}

.deco-right {
    top: -25px;
    right: -1px;
    width: 250px;
}

@media (max-width: 640px) {
    body {
        background: var(--paper);
    }

    .language-page {
        min-height: 100vh;
        display: block;
        padding: 0;
    }

    .language-card {
        width: 100%;
        min-height: 100vh;
        border: none;
        border-radius: 0;
        box-shadow: none;
        padding: 32px 24px;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .language-logo {
        width: min(280px, 90%);
        margin-bottom: 20px;
    }

    .deco {
        -webkit-mask-image: linear-gradient(to bottom,
                black 0%,
                black 95%,
                transparent 100%);
        mask-image: linear-gradient(to bottom,
                black 0%,
                black 95%,
                transparent 100%);
    }

    .deco-left {
        top: 240px;
        left: 0;
        width: 190px;
    }

    .deco-right {
        top: 240px;
        right: 0;
        width: 190px;
    }

    .language-card h1 {
        font-size: clamp(2.2rem, 12vw, 3.2rem);
    }

    .language-actions button {
        padding: 18px 20px;
    }
}

/*========== Transition ========*/

.page-transition {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    place-items: center;
    pointer-events: none;

    background: var(--paper);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.transition-bg {
    position: absolute;
    inset: 0;
    background: url("../assets/images/trans.png") center / contain no-repeat;
    opacity: 0;
    transform: scale(1.05);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.transition-logo {
    position: relative;
    width: min(240px, 60vw);
    z-index: 1;

    transform: scale(0.9);
    opacity: 0;
    transition: transform 0.6s ease, opacity 0.6s ease;
}

.page-transition.is-active {
    opacity: 1;
}

.page-transition.is-active .transition-bg {
    opacity: 0.9;
    /* subtle */
    transform: scale(1);
}

.page-transition.is-active .transition-logo {
    transform: scale(1);
    opacity: 1;
}