* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
}

body {
    background: linear-gradient(145deg, #f0f4fa 0%, #e6ecf5 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.card {
    max-width: 800px;
    width: 100%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 48px;
    padding: 40px 35px;
    box-shadow: 0 25px 50px -8px rgba(0, 20, 40, 0.25),
    0 1px 3px rgba(0,0,0,0.05),
    inset 0 1px 2px rgba(255,255,255,0.6);
    border: 1px solid rgba(255,255,255,0.5);
}

.title {
    font-size: 2.2rem;
    font-weight: 600;
    letter-spacing: 1px;
    color: #1e2b3c;
    text-align: center;
    margin-bottom: 30px;
    text-shadow: 2px 2px 3px rgba(255,255,255,0.7), 0px 0px 0px rgba(0,0,0,0.1);
    word-break: break-word;
}

.method-row {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.method-btn {
    flex: 1 1 200px;
    max-width: 250px;
    background: rgba(230, 240, 255, 0.6);
    border: 2px solid rgba(55, 85, 120, 0.3);
    border-radius: 60px;
    padding: 18px 20px;
    font-size: 1.8rem;
    font-weight: 600;
    color: #1e3b5c;
    cursor: pointer;
    transition: 0.2s ease;
    box-shadow: 0 5px 15px rgba(0, 20, 40, 0.1);
    backdrop-filter: blur(5px);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    line-height: 1;
}

.method-btn:hover {
    background: #ffffffcc;
    border-color: #4b7bb8;
    transform: translateY(-3px);
    box-shadow: 0 15px 25px -8px #1e3f5e60;
}

.method-btn.active {
    background: #ffffff;
    border-color: #2c577e;
    box-shadow: 0 10px 20px -5px #1e3f5e, inset 0 0 0 2px white;
    color: #0f2b40;
}

.input-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-label {
    font-size: 1rem;
    font-weight: 500;
    color: #2e4359;
    margin-left: 12px;
    letter-spacing: 0.3px;
}

.input-field {
    width: 100%;
    padding: 18px 22px;
    background: rgba(255, 255, 255, 0.7);
    border: 1.5px solid rgba(75, 100, 130, 0.3);
    border-radius: 40px;
    font-size: 1.1rem;
    transition: 0.15s;
    outline: none;
    color: #1b2a3b;
    backdrop-filter: blur(4px);
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.02);
}

.input-field:focus {
    border-color: #4f7eb3;
    background: #ffffff;
    box-shadow: 0 0 0 4px rgba(70, 130, 200, 0.2), inset 0 1px 4px #00000010;
}

.input-field::placeholder {
    color: #8b9eb5;
    font-weight: 300;
    font-size: 1rem;
}

/* Стили для контейнера с ключами Плейфера */
.keys-container {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.key-item {
    flex: 1 1 calc(50% - 15px);
    min-width: 140px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.key-item .input-label {
    font-size: 0.95rem;
    margin-left: 8px;
}

.key-item .input-field {
    padding: 14px 18px;
}

/* Стили для одного ключа (Виженер) */
.single-key {
    margin-bottom: 20px;
}

.action-row {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 25px;
    flex-wrap: wrap;
}

.action-btn {
    flex: 1 1 140px;
    min-width: 140px;
    padding: 16px 20px;
    border-radius: 50px;
    border: none;
    font-size: 1.2rem;
    font-weight: 600;
    background: #ffffffde;
    color: #1f3b57;
    border: 1px solid #b3c7e0;
    box-shadow: 0 8px 16px -8px #2a4055, 0 0 0 1px #ffffffb0 inset;
    cursor: pointer;
    transition: 0.15s;
    backdrop-filter: blur(5px);
    letter-spacing: 0.6px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.action-btn:hover {
    background: #ffffff;
    box-shadow: 0 12px 20px -10px #1f3b57, 0 0 0 2px #ffffff inset;
    border-color: #6f9ad0;
    transform: scale(1.02);
    color: #0f2b45;
}

.action-btn:active {
    transform: translateY(3px);
    box-shadow: 0 4px 10px -2px #1f3b57;
}

.action-btn.clear {
    background: #ecf2fa;
    color: #2e4b6b;
}

.file-row {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin: 20px 0 10px;
    flex-wrap: wrap;
    border-top: 2px dashed rgba(75, 100, 130, 0.2);
    padding-top: 25px;
}

.file-btn {
    flex: 1 1 180px;
    max-width: 220px;
    padding: 14px 20px;
    border-radius: 40px;
    border: none;
    font-size: 1.1rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.6);
    color: #2e4b6b;
    border: 1.5px solid rgba(55, 85, 120, 0.2);
    backdrop-filter: blur(5px);
    cursor: pointer;
    transition: 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.5px;
}

.file-btn:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: #4b7bb8;
    transform: translateY(-2px);
    box-shadow: 0 8px 15px -6px #1e3f5e60;
}

.file-btn:active {
    transform: translateY(1px);
}

.input-group:last-of-type {
    margin-bottom: 10px;
}

.hint {
    font-size: 0.9rem;
    margin-left: 16px;
    color: #4f657f;
    margin-top: 15px;
}

.hidden-file-input {
    display: none;
}

@media (max-width: 600px) {
    .card {
        padding: 30px 20px;
        border-radius: 36px;
    }
    .title {
        font-size: 1.8rem;
    }
    .method-btn {
        font-size: 1.4rem;
        padding: 15px 10px;
    }
    .input-field {
        padding: 15px 18px;
        font-size: 1rem;
    }
    .action-btn {
        font-size: 1.1rem;
        padding: 14px 10px;
        min-width: 120px;
    }
    .file-btn {
        font-size: 1rem;
        padding: 12px 16px;
    }
    .key-item {
        flex: 1 1 100%;
    }
}

@media (max-width: 480px) {
    .action-row, .file-row {
        gap: 10px;
    }
    .action-btn, .file-btn {
        flex: 1 1 100%;
        max-width: none;
    }
}