@import url('https://fonts.googleapis.com/css2?family=Raleway:wght@400;600;700&display=swap');

:root {
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Raleway', system-ui, sans-serif;
    background: linear-gradient(145deg, #0f162a, #1a2662 60%, #1f3d71);
    color: #f7f9ff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.landing-shell {
    flex: 1;
    text-align: center;
    padding: 4rem 2rem 3rem;
    border-radius: 32px;
    background: rgba(15, 22, 42, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.45);
    width: min(460px, 90vw);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 40px auto 0;
}

.logo {
    width: 84px;
    height: 84px;
    margin-bottom: 1rem;
}

.landing-shell h1 {
    font-size: 44px;
    margin: 0;
}

.tagline {
    margin: 12px 0 24px;
    font-size: 16px;
    color: rgba(247, 249, 255, 0.8);
    line-height: 1.4;
}

.landing-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.landing-professor {
    margin-top: 16px;
    font-size: 0.85rem;
}

.landing-professor__link {
    color: rgba(255,255,255,0.78);
    text-decoration: underline;
    opacity: 0.75;
    transition: opacity 0.2s ease;
}

.landing-professor__link:hover {
    opacity: 1;
}

.install-button {
    margin-top: 14px;
    background: transparent;
    border: 1px dashed rgba(255, 255, 255, 0.35);
    color: rgba(255, 255, 255, 0.7);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.install-button:hover {
    color: rgba(255, 255, 255, 0.95);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-1px);
}

.site-footer, .landing-footer {
    margin-top: auto;
    width: 100%;
    display: flex;
    justify-content: center;
}

.site-footer__link, .landing-footer__link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.75);
    font-size: 0.85rem;
}

.site-footer__logo, .landing-footer__logo {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.2);
    object-fit: cover;
}

.site-footer__content, .landing-footer__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.site-footer__about, .landing-footer__about {
    margin: 0;
    font-size: 0.75rem;
    color: rgba(255,255,255,0.65);
}

.landing-professor__link:hover {
    opacity: 1;
}

.btn {
    padding: 14px 18px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    display: inline-flex;
    justify-content: center;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn.primary {
    background: linear-gradient(135deg, #ffee70, #ffb347);
    color: #1b1b1b;
    box-shadow: 0 12px 24px rgba(255, 183, 71, 0.4);
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: #fefefe;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.35);
}

 .lang-switcher{
     position: fixed;
     top: 18px;
     right: 18px;
     display: inline-flex;
     gap: 6px;
     align-items: center;
     background: rgba(255,255,255,0.08);
     border-radius: 999px;
     padding: 4px 10px;
     border: 1px solid rgba(255,255,255,0.25);
     z-index: 10;
     font-size: 13px;
     letter-spacing: 0.04em;
 }

 .lang-switcher span{
     font-weight: 600;
     text-transform: uppercase;
     color: rgba(247,249,255,0.82);
 }

 .lang-switcher button{
     width: 32px;
     height: 32px;
     border-radius: 999px;
     border: none;
     background: transparent;
     color: #f7f9ff;
     font-weight: 700;
     cursor: pointer;
     transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
 }

 .lang-switcher button.active{
     background: #ffe670;
     color: #1b1b1b;
 }

 .lang-switcher button:hover{
     transform: translateY(-1px);
 }

@media (max-width: 500px) {
    .landing-shell {
        padding: 3rem 1.5rem;
    }

    .landing-shell h1 {
        font-size: 34px;
    }

    .landing-actions {
        gap: 10px;
    }
}