<head>
  <meta charset="UTF-8">
  <title>Мое приложение</title>
  <style>
body {
    font-family: "Segoe UI", Arial, sans-serif;
    margin: 0;
    text-align: center;
    background: linear-gradient(135deg, #e3f2fd, #fce4ec);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 950px;
    margin: 20px auto;
    padding: 20px;
    background: rgba(255,255,255,0.9);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

h2 {
    font-size: 30px;
    margin-bottom: 10px;
    color: #2c3e50;
}

hr {
    border: none;
    height: 2px;
    background: linear-gradient(to right, #90caf9, #f48fb1);
    margin: 15px 0 25px 0;
}

form {
    margin-bottom: 15px;
    padding: 10px;
    background: #f7fbff;
    border-radius: 10px;
}

label {
    font-weight: 600;
    color: #2c3e50;
}

select {
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 15px;
}

.block {
    margin: 18px 0;
    padding: 18px;
    border-radius: 14px;
    font-size: 22px;
    background: #ffffff;
    box-shadow: 0 6px 18px rgba(0,0,0,0.1);
    min-height: 70px;
}

#russian {
    font-size: 26px;
    font-weight: bold;
    background: linear-gradient(135deg, #e1f5fe, #ffffff);
}

#words {
    background: #f9fbe7;
}

#result {
    font-weight: bold;
    color: #2e7d32;
    font-size: 26px;
    background: linear-gradient(135deg, #e8f5e9, #ffffff);
}

.word {
    display: inline-block;
    padding: 12px 16px;
    margin: 7px;
    border-radius: 10px;
    cursor: pointer;
    background: linear-gradient(135deg, #ffffff, #e3f2fd);
    border: 1px solid #90caf9;
    font-size: 20px;
    transition: all 0.2s ease;
    user-select: none;
}

.word:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, #e1f5fe, #bbdefb);
}

.correct {
    background: linear-gradient(135deg, #c8e6c9, #e8f5e9);
    border-color: #43a047;
}

.helper-text {
    font-size: 18px;
    font-weight: 600;
    margin-top: 15px;
    color: #37474f;
}

.word-trainer-box {
    margin: 25px 0;
    padding: 15px;
    background: linear-gradient(135deg, #fff3e0, #ffffff);
    border-radius: 12px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}

.word-trainer-box a {
    display: inline-block;
    padding: 12px 20px;
    background: linear-gradient(135deg, #4CAF50, #2e7d32);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: bold;
    transition: 0.2s;
}

.word-trainer-box a:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

iframe {
    border-radius: 12px;
}

/* Адаптивность */
@media (max-width: 600px) {
    h2 { font-size: 24px; }
    .block { font-size: 20px; padding: 14px; }
    .word { font-size: 18px; padding: 10px 12px; }
    #result { font-size: 22px; }
}
/* --- Адаптивность для планшетов --- */
@media (max-width: 1024px) {
    .container {
        width: 95%;
        padding: 10px;
    }

    .top-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    select, button {
        width: 100%;
        font-size: 16px;
    }

    .sentence-box {
        font-size: 20px;
        text-align: center;
    }

    .words-container {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* --- Адаптивность для телефонов --- */
@media (max-width: 600px) {
    h1, h2, h3 {
        font-size: 18px;
        text-align: center;
    }

    .sentence-box {
        font-size: 18px;
        padding: 10px;
    }

    .word {
        font-size: 16px;
        padding: 8px 10px;
        margin: 4px;
    }

    .help-frame {
        height: auto;
        min-height: 300px;
    }

    .trainer-link-block {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }
}

.lessons-block {
    text-align: left;
    background: linear-gradient(135deg, #fff8e1, #ffffff);
    border: 2px solid #ffe082;
}

.lessons_title {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 10px;
    color: #ff8f00;
}

.lessons-list {
    margin: 0;
    padding-left: 22px;
    font-size: 18px;
    line-height: 1.6;
}

.lessons-list li {
    margin-bottom: 6px;
}

/* адаптация под мобильные */
@media (max-width: 600px) {
    .lessons_title {
        font-size: 20px;
    }
    .lessons-list {
        font-size: 17px;
    }
}

  </style>
</head>