/* ========== Базовые стили ========== */
body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 16px;
}

.login-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    text-align: center;
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ========== Заголовок ========== */
.welcome {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, var(--primary) 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--gray-500);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* ========== Переключатель с анимацией ========== */
.toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    background: var(--gray-100);
    padding: 4px;
    border-radius: 40px;
    position: relative;
    width: 280px;
    margin-left: auto;
    margin-right: auto;
}

.toggle-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: white;
    border-radius: 36px;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
}

.toggle-item {
    flex: 1;
    padding: 10px 20px;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: 36px;
    transition: color 0.3s ease;
    background: transparent;
    border: none;
    font-size: 0.95rem;
    z-index: 2;
    position: relative;
}

.toggle-item.active {
    color: var(--primary);
}

/* Позиция слайдера для регистрации */
.toggle-item:last-child.active ~ .toggle-slider,
.toggle.register-mode .toggle-slider {
    transform: translateX(100%);
}

/* ========== Форма ========== */
.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
    opacity: 1;
    max-height: 100px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-group-hidden {
    opacity: 0;
    max-height: 0;
    margin-bottom: 0;
    transform: translateY(-10px);
}

.form-group-hidden.active {
    opacity: 1;
    max-height: 100px;
    margin-bottom: 1.5rem;
    transform: translateY(0);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--gray-100);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-control::placeholder {
    color: var(--gray-400);
}

/* ========== Кнопка отправки ========== */
.submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Текст кнопки с анимацией */
.btn-text {
    transition: opacity 0.2s ease;
}

.submit-btn.loading .btn-text {
    opacity: 0;
}

/* Лоадер */
.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: opacity 0.2s ease;
}

.submit-btn.loading .btn-loader {
    opacity: 1;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ========== Забыли пароль ========== */
.forgot-password {
    margin-top: 1.5rem;
}

.forgot-password a {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.forgot-password a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ========== Сообщения об ошибках ========== */
.flashes {
    list-style: none;
    padding: 0;
    margin-top: 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.flashes.has-errors {
    max-height: 200px;
}

.flashes li {
    background: #fee2e2;
    color: #b91c1c;
    padding: 12px;
    border-radius: 8px;
    border-left: 4px solid #ef4444;
    font-size: 0.9rem;
    margin-bottom: 8px;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* ========== Адаптивность ========== */
@media (max-width: 480px) {
    .login-card {
        padding: 30px 24px;
    }

    .welcome {
        font-size: 2rem;
    }

    .toggle {
        width: 100%;
    }
}